R-1737 - 07/10/2018 - DU PAGE COUNTY - Resolutions Supporting DocumentsREG BOT 071018 Agenda Item 6.C.1 - DuPage Hazard Mitigation Plan -
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ITEM 6.C.1
BOARD OF TRUSTEES MEETING
SAMUEL E. DEAN BOARD ROOM
BUTLER GOVERNMENT CENTER
1200 OAK BROOK ROAD
OAK BROOK, ILLINOIS
630-368-5000
AGENDA ITEM
Regular Board of Trustees Meeting
of
July 10, 2018
SUBJECT: DuPage County Natural Hazards Mitigation Plan
FROM: Tony Budzikowski, AICP, Development Services Director
BUDGET SOURCE/BUDGET IMPACT: N/A
RECOMMENDED MOTION: I move that the Village Board approve Resolution R-1737,
which adopts the 2018 DuPage County Natural Hazards Mitigation Plan as the official plan
of the Village of Oak Brook.
Background/History:
DuPage County recently adopted the 2018 County Natural Hazards Mitigation Plan on June 5,
2018. As has been past practice, Oak Brook and other DuPage County municipalities similarly
adopt this mitigation plan as a way to assess hazards and resources to produce a long-term and
sustainable program of activities to mitigate the impact of natural hazards. The mitigation plan is
a requirement for many pre and post disaster mitigation funds from the state and federal
government. The adoption of a mitigation plan also assists us in our participation in FEMA’s
Community Rating System (CRS) whereby a multi-hazard and multi-jurisdictional plan helps us
to fulfill certain requirements for the rating system and lowers flood insurance rates within the
community for residential and non-residential property owners.
Oak Brook has previously adopted mitigation plans in 2006, 2008 and again in 2012. The plan
has been developed and updated because DuPage County is subject to a variety of natural
hazards that threaten life and health, and these hazards can cause millions of dollars of property
damage. The County is vulnerable to floods, winter storms, tornadoes, severe summer storms,
earthquakes, drought and extreme heat. While natural hazards are acts of nature, there are
preventive measures that can be taken to reduce and mitigate their impacts on residents, public
facilities and private property.
REG BOT 071018 Agenda Item 6.C.1 DuPage Hazard Mitigation Plan -
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The updated plan is a comprehensive and continuing effort. The plan meets the requisite state
and federal guidelines and should be adopted in order for the Village of Oak Brook to remain
eligible for grant funding.
Recommendation:
Staff recommends that the Village Board approve the accompanying resolution.
Approve Resolution R-1737
RESOLUTION 2018-DU-EM-EX-R-1737
A RESOLUTION ADOPTING THE DUPAGE COUNTY NATURAL HAZARD MITIGATION PLAN
WHEREAS, the Village of Oak Brook is subject to natural hazards, such as, floods, severe summer
and winter storms tornadoes, extreme heat events, and
WHEREAS, natural hazards can damage property, close businesses, disrupt traffic, can threaten
lives, and present public health and safety hazards; and
WHEREAS, the Federal Emergency Management Agency (“FEMA”) requires municipalities to
prepare and adopt natural hazard mitigation plans in order to be eligible to receive federal mitigation funds;
and
WHEREAS, the DuPage County Natural Hazards Mitigation Workgroup has prepared a
recommended DuPage County Natural Hazards Mitigation Plan of 2018 that reviews the Village’s options
to protect people and reduce damage from the hazards; and
WHEREAS, the Village has participated in the development of the DuPage County Natural Hazards
Mitigation Plan; and
WHEREAS, the recommended DuPage County Natural Hazards Mitigation Plan has been
presented for review by residents, federal, state and regional agencies;
NOW THEREFORE, BE IT RESOLVED BY THE PRESIDENT AND BOARD OF TRUSTEES OF
THE VILLAGE OF OAK BROOK, DU PAGE AND COOK COUNTIES, ILLINOIS, as follows:
Section 1. Recitals. The DuPage County Natural Hazards Mitigation Plan is hereby adopted
as an official plan of the Village.
Section 2. Adoption of the Plan. The DuPage County Natural Hazards Mitigation Plan
identifies a series of action items. The following action items are hereby assigned to the noted person or
department of the Village. The designated person or department shall be responsible for the
implementation of the action item, provided that resources are available, by the deadline listed in the Plan.
Action Item 1: Establish Sub-Workgroups within the Mitigation Workgroup
Action Item 2: Enhance Public Participation in Mitigation Workgroup
Action Item 3: National Weather Service Storm Ready Participation
Action Item 4: Critical Infrastructure Identification and Verification
Action Item 5: Critical Facility Back-Up Generation Assessment
Action Item 6: Adopt County-Wide Public Outreach Monthly Topics
Action Item 7: Flood Control and Property Protection Projects
Action Item 8: Improve Building Code Ratings
Action Item 9: Incorporate Mitigation Concepts into Future Planning
Action Item 10: Participate in Tree City USA
Action Item 11: Participate in Community Rating System (CRS) Program
Action Item 12: Participate and Support Floodplain Management Studies
Section 3. Village Representative. Development Services Director is hereby appointed as
the Village’s representative on the DuPage County Natural Hazards Mitigation Workgroup. The offices
charged with implementation of action items in Section 2 shall keep the representative advised of their
progress and recommendations.
Resolution 2018-DU-EM-EX-R-1737
DuPage Natural Hazard Mitigation Plan
Page 2 of 3
Section 4. Repealer. The natural hazard mitigation plan adopted by the Village pursuant to
Resolution 2013-DU-EM-R-1275 shall be, and is hereby, repealed in its entirety and shall no longer be in
force and effect.
Section 5. Severability. If any section, paragraph, clause or provision of this Resolution shall
be held invalid, the invalidity thereof shall not affect any of the other provisions of this Resolution.
Section 6. Effective Date. This Resolution shall be in full force and effect from and after its
passage, approval, and publication in the manner provided by law.
APPROVED THIS 10th day of July, 2018.
_________________________________________
Gopal G. Lalmalani
Village President
PASSED THIS 10th day of July, 2018.
Ayes: ________________________________________________________________________
Nays: ______________________________________________________________________
Absent: ____________________________________________________________________
ATTEST:
_______________________________________
Charlotte K. Pruss
Village Clerk
Resolution 2018-DU-EM-EX-R-1737
DuPage Natural Hazard Mitigation Plan
Page 3 of 3
EXHIBIT “A”
DUPAGE COUNTY NATURAL HAZARD MITIGATION PLAN
OuPag·e Cou_nty
Natu.raJ Ha .~.a~rd Mltig·atio..trl Plan
2018
Chapter 1 -Introduction
1.1 Overview
1.2 DuPage County
1.3 Planning Approach
Chapter 2 -Hazard Analysis
2 .1 Floods
2.2 Severe Summer Storm
2.3 Severe Winter Storms
2.4 Tornadoes
2.5 Drought
2.6 Extreme Heat
2.7 Earthquakes
2.8 Ground Failure
2.9 Conclusions
Chapter 3 -Goals
3.1 Community Priorities
3.2 Plan Direction
3 .3 Goals and Guidelines
Table of Contents
Chapter 4 -Preventive Measures
4.1 Building Codes
4.2 Planning and Zoning
4 .3 Subdivision Regulations
4.4 Stormwater Management
4 .5 Hazard Mapping
4.6 Conclusions
4.7 Recommendations
Chapter 5 -Property Protection
5.1 Barriers, Elevation, Relocation, and Acquisition
5.2 Retrofitting -Modify the Building
5.3 Insurance
5.4 The Government's Role
5.5 Repetitive Flood Loss Properties
5 .6 Conclusions
5 .7 Recommendations
Chapter 6 -Structural Projects
6 .1 Reservoirs and Detention
6.2 Levees and Barriers
6.3 Channe l Improvements and Diversions
6.4 Crossings and Roadways
Table of Contents
Natural Hazard Mitigation Plan
Page 1-1
Page 1-2
Page 1-8
Page 2-3
Page 2-19
Page 2-24
Page 2-31
Page 2-36
Page 2-38
Page 2-42
Page 2-46
Page 2-48
Page 3-1
Page 3-1
Page 3-2
Page 4-2
Page 4-6
Page 4-11
Page 4-12
Page 4-15
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Page 4-16
Page 5-1
Page 5-5
Page 5-8
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Page 5-17
Page 5-17
Page 6-1
Page 6-4
Page 6-5
Page 6-7
2018
6.5 Drainage and Storm Sewer Improvements
6.6 DuPage County Planned Structural Projects
6. 7 Conclusions
6.8 Recommendations
Chapter 7 -Natural Resource Protection
7.1 Open Space Preservation
7.2 Wetland Protection
7 .3 Stream Restoration
7.4 Urban Forestry
7.5 Waste Management and Recycling
7 .6 Conclusions
7.7 Recommendations
Chapter 8 -Emergency Services
8.1 Protection
8.2 Response
8.3 Recovery and Mitigation
8.4 Conclusions
8.5 Recommendations
Chapter 9 -Public Information
9.1 Public Information Program Strategy
9.2 Community Resources
9.3 Real Es tate Disclosure
9.4 Conclusions
9.5 Recommendations
Chapter 10 -Action Plan
10.1 Plan Maintenance
10.2 Action Items
Appendix A -Workgroup Participants
Appendix B -Public Involvement Activities
Appendix C -Resolution Examples
Appendix D -Public Input Survey Results
Appendix E -Community Specific Information
Appendix F -2017 Natural Hazard Mitigation Plan Annual Report
Table of Contents
Natural Hazard Mitigation Plan
Page 6-8
Page 6-10
Page 6-13
Page 6-13
Page 7-1
Page 7-2
Page 7-3
Page 7-6
Page 7-7
Page 7-13
Page 7-13
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Page B-1
Page C-1
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Page F-1
2018
Natural Hazard Mitigation Plan
Chapter 1 -Introduction
1.1 Overview
DuPage County, located approximately 20 miles west
of Chicago in northeastern Illinois, is home to
approximately 929,368 (Illinois Demographics, N.D.,
P. 1) residents. The County seat, Wheaton, is located
near the center of the County's approximately 334
square miles. The County includes nine townships
(Exhibit 1-6) and 39 municipalities that partially or
completely reside within the County boundaries
(Exhibit 1-6). DuPage is the second largest County in
the State, bordered by Cook County (the largest
County) to the east, Lake and McHenry Counties to
the north, Kane County to the west, and Will County to
the south. Like its neighbors, DuPage is vulnerable to
natural hazards that threaten life safety, public health,
business and economy, and critical infrastructure.
DuPage County has experienced 13 State and
Federally declared disaster declarations since 1967 (Table 2-1). Hazard mitigation,
according to the Federal Emergency Management Agency (FEMA) is "the effort to reduce
loss of life and property by lessening the impact of disasters. It is most effective when
implemented under a comprehensive, long-term mitigation plan. State, tribal, and local
governments engage in hazard mitigation planning to identify risks and vulnerabilities
associated with natural disasters, and develop long-term strategies for protecting people
and property from future hazard events." (FEMA, 2017a, P. 1). "Hazard mitigation" does
not mean that all hazards are stopped or prevented. Natural forces are powerful and
most natural hazards are well beyond our ability to control. In addition, natural hazards
can be compounded by manmade hazards and vice versa. Hazard mitigation means a
long-term, permanent, and comprehensive approach to minimizing and reducing hazard
vulnerability.
Purpose of Planning: Planning is one of the best ways to assess hazards and resources to
produce a long-term and sustainable program of activities to mitigate the impact of
hazards. A well-prepared plan will ensure that activities are reviewed and implemented so
that the problem is addressed by the most appropriate and efficient solutions. It can also
ensure that activities are coordinated with each other and with other goals and activities,
preventing conflicts and reducing the costs of implementing each individual activity.
Purpose of this Pfarr. This Plan identifies activities that can be undertaken by both the
public and the private sectors to reduce safety hazards, health hazards, and property
damage caused by natural hazards. The Plan focuses on the seven major natural hazards
facing DuPage County: floods, winter storms, tornadoes, severe summer storms,
earthquakes, drought, and extreme heat.
Introduction 1-1 2018
Natural Hazard Mitigation Plan
A mitigation plan is a requirement for many pre and post disaster mitigation funds (FEMA,
2017b, P.1). In addition, communities that participate in FEMA's Community Rating
System (CRS), a program that reduces National Flood Insurance Program (NFIP)
premiums, and are designated as a "Category C" repetitive l oss community (as defined in
Section 502), must prepare a Floodplain Management Plan (FMP) or a Repetitive Loss
Area Analysis (RLAA). (FEMA, 2017c, p. 401). The CRS program allows multi-hazard and
multi-jurisdictional plans to fulfill this requirement, as long as the planning process
follows a process (outlined in Exhibit 1-7).
Th is Plan fulfills the federal requirements for mitigation funding outlined in 44 Code of
Federal Regulations, section 201.6 (U.S. Government Publishing Office, 2013, P. 1), and
U.S. Code 42, section 5165 (U.S. Government Publishing Office, 2011, P. 1), the CRS
program, and provides the County with a
blueprint for reducing the impacts of natural
hazards. A list of municipalities with general
information, including the community number
for FEMA's NFIP and participation in CRS, are
shown in Table 1-2. The NFIP and CRS
programs are discussed in Chapter 4.
1.2 DuPage County
Population, Employment, and Housing: Whil e
surrounding counties may be experiencing
suburban sprawl, DuPage County is already
cons idered to be primarily urban. As of 2017,
the County's average popu lation density was
estimated to be 2,871 people per square mile,
compared to the State average of 235 people
per square mile (ArcGIS, 2017a). Exhibit 1-2
(right) shows the County's population density -
identified by U.S. Census tract -increases
towards the central and south eastern portions
of the County (ArcGIS, 2017a). While the
County's population esti mates show a slight
decline since 2014, (Illinois Demographics,
N.D., P. 1), as shown in Table 1-1, urbanization
shows no signs of s lowing down . As
urbanization continues, emergency
management and other public sectors must
Exhibit 1-2
DuPage County Population Density Map
, H'P:Sh
.! t
2017 USA Population Density
Tract
8 116,000 -618,125 peo ple per sq mi
22,000 -116,000 peop le per sq m i
4,000 · 22,000 people per sq mi
1,000 -4,000 people per sq mi
0 -1,000 people per sq ml
evo lve to support challenges that come with a greater population density.
In 2015, the County had approximate ly 357,016 total hous i ng units (248,508 owned and
occupied; 89,575 rental units; 18,933 vacant housing units), with an average family size
of 2.6 (American Fact Finder, 2016, P. 1). That number has since declined to
approximately 345,039 total housing units, with an average family size of 2.7 (ArcGIS,
2017b). The average household incom e and median home values have also in creased:
Introduction 1-2 2018
Table 1-1
DuPage County Population Estimates
Census Population
Year Estimate
2000 904,161
2010 916,924
2011 924,245
2012 927,668
2013 931,296
20 14 932,419
2015 930,412
2016 929,368
Natural Hazard Mitigation Plan
Home Values 2017 (ArcGIS, 2017c)
DuPage Median Home Value: $304,449
Illin ois Median Home Value: $195,300
U.S. Median Home Value: 307,344
Home Values 2015 (ArcGIS, 2015a)
DuPage Median Home Value: $295,974
Ill inois Median Hom e Value: $199,064
U.S. Median Home Value: $200,000
Income Levels 2017 (ArcGIS, 2017d)
DuPage Average Income: $113,107
Ill ino is Average Income: $84,983
U.S. Average Income: $80,675
Income Levels 2015 {ArcGIS, 2015b)
DuPage Average Income: $108,066
Illinois Average Income: $78,861
U.S. Average Income : $74,699
Within DuPage County, 45% of persons over the age of 25 have a Bachelor's degree or
higher, and 91% of residents over 15 have a high school degree or higher" (Choose
Du Page, N.D.a, P. 1). Of the 929,368 County residents, 514,030 are of working age
(American Fact Finder, 2017, P. 1). Exhibit 1-3 shows employme nt industries within
DuPage County (American Fact Fin der, 2017, P.1). Approximately 6.1% of that number is
Exhibit 1-3
DuPage County Employment Industries
A ll ~ tnt«Ultvntot, otd rr <Jto!ln•\ ~ntl.1<aHnmod.ltlro •
onJ food ,.,vlr:u
Introduction
r roft:\<IOr>l l, ><il'llllfk, •nd m•n»il"mrnt, and
ddmlrl>tt ~tl\'C Md W.)ll C ltli\Mg\'mct\T ~l\'ICC"< •
1-3
• 11UictJh11r. lorcitry, lilh1'1! and h1.<1tine, and mining
I (OO>llv<tlOll
11 Pubtlc admlrl)tratloo
• tll;ltl(C Md irlw>dn(t, nnd rNI 1.;1.11~ and t<"OWI and
l~•ll ng
2018
Natural Hazard Mitigation Plan
est i mated to be unemp loyed, and approximately 7% of the total popu lation is considered
to be at or below the poverty level (American Fact Finder, 2017, P.1). Emp loyed residents
commute to work locations, both inside and outsid e the County, primarily alone and
within a person al vehicle (367,244 people); seco ndary methods include carpooling
(35,649), and public transportation such as commuter rail (30,972) and walking (7 ,621)
(American Fact Finder, 2017, P.1). Those who commute travel an average of 29.1
minutes one way (Amer ican Fact Finder, 2017, P.1) and 21,800 m il es per year (CMAP,
2017, P. 5). According to Choose DuPage "Nearly 700,000 jobs and 40,000 b us iness
locations make [the] County (a] proven and premier business location " (Choose DuPage,
N.D.a , P. 1). Navistar, Ace Hardware, Blue Cross Blue Shield, Microsoft, McDonalds,
Commonwealth Edison, Nicor Gas, and BP all have large corporate offices located within
the County, in addition to backup data centers for large Chicago financial and banking
institutions.
Exhibit 1-4
Equalized Assessed Value by Property Category
with i n DuPage County
Residential $25,583.305,234
Commercia l $5,728,648,276
Industrial $2,546,924,540
Rall road $39,270,054
Farm $2,148,686
Mineral $0
TOTAL $33,900,296,790
Land Use and Infrastructure:
Nearly 80% of DuPage County
is developed (i.e. no n-open
space) (CMAP, 2017, P. 6), with
a large amount of critica l
infrastructure . Exhibit 1-5
outlines how the County's land
is used by sectors (CMAP,
2017, P. 6). Assessed property
values in DuPage County are
maintained by the township
assessor off ices. Residential
property market value can be estimated by multiplying the assessed valuation of the
home and property by three. Exhibit 1-4 shows the estimated equa li zed assessed
property value by category within DuPage County (CMAP, 2017, P. 6). Note that when the
words "critical infrastructure " are used, this Plan is referring to the 16 sectors identified
by the Department of Homeland Security. According to OHS, th e definition of critical
infrastructure is "assets, systems, and networks, whether physical or virtual, so vital to
the United States that their incapacitation or destruction would have a debilitating effect
on security, national economic security, national public hea lth or safety, or any
comb i nation thereof" (Department of Homeland Security, 2017, P. 1). Further information
on critica l infrastructure can be found within Chapter 8.
The County is served by 39 fire and emergency medical services (EMS) agencies, 37 law
enforcement agencies, and 46 public works agencies. The County a lso has 22
wastewater facilities and 53 drinking wate r systems, with t he DuPa ge Water Commission
being the largest for the latter, with approximately 7 49,636 served annua lly (New York
Times, N.D., P. 1). The County has 43 school districts, which are regularly rated among
the best in the Country, and approximately 19 accredited Colleges and Universities.
DuPage has eight hosp itals (Adventist, Glen Oaks, Adventist Hinsdale, Advocate Good
Samaritan, Northwestern Memorial Central DuPage, Edward , and Elmhurst), five public
safety answering points (PSAP) (DuPage County Sheriff, Addison Consolidated Dispatch
(ACDC), DuPage Public Safety Communications (DU-COMM), Naperville, and NORCOM),
and two federal laboratori es (Fermi National Accelerator Laboratory l ocated in Warrenville
Introduction 1-4 2018
Natural H azard Mitigation Plan
and Batavia, an d Argonne Nationa l Laboratory located in Lemo nt}. The Fede ra l Bu rea u of
Investigation (FBI) operates an office out of Lis le, and a United States Posta l Service
(USPS) distribution center is located in Carol Stream.
1.7%
Agriculture •
Exhibit 1-5
DuPage County Land Usage
2.9% vacant
• Multi-Fam i ly Res ident ial
2.4%
Commercial
Transportat ion within the County includes three interstates and toll roads, and nine other
State and U.S h ighways. Center l ine mi les for all roadways within DuPage County
(excludi n g r esid en tia l ) tota ls 1 ,113.4 7; a nd the tot a l numbe r of ve hi c le mi les trave led
(excluding residentia l ) per day for Cook County, DuPage County, Il linois Department of
Transportation (IDOT), Illinois State Tollway Author ity, and municipal roads equals
24,090,597. The County has approximately 321 bridges (pedestrian, road, and rail), two
airports (DuPage and O'Hare International), four pipelines for refined petroleum products,
one waterway for petroleum movement, and 329 mi les of rai lroad track which ru n
approx imately 422 t rains da il y (DuP age Cou nty Offi ce of Hom elan d Sec urity and
Emergency Management, 2017, P. 2). Approximate ly 50% of all U.S. freight cargo passes
through DuPage County (Choose DuPage, N.D.b, P. 1); and all six Class-One North
American Rail Lines touch DuPage , operated by four companies (Burlington Northern
Santa FE (BNSF), Canadian Pacific (CP), Canadian National (CN), and Union Pacific).
Three passenger rai l li nes are operated by Metra (Union Paci fic/ West Line, Mi lwaukee
Distri ct/ West Line , and BNSF Lin e), and fo ur a dd itiona l passenge r rail li nes a re operated
by Amtrak (Ca l ifornia Zephyr, Ill inois Zephyr, Carl Sandburg, and Southwest Chief)
(DuPage County Office of Homeland Security and Emergency Management, 2017, P. 2).
Ag ricultural land includes farmhouses, nurseries, agricultural businesses, and improved
farm land. In addition, open space also inc l udes the nearly 26,000 acres of land owned by
th e DuPage Cou nty Forest Prese rve District (Forest Pr eserve Dist r ict of DuPage Co u nty,
N.D., P.1) and approximately 52 miles of recreationa l biking and wa l king trai ls .
Chapter 2 discusses critical facilities that are impacted by the various types of natural
hazards. Hazard mitigation measures for critical facilities are identified in Chapters 4
through 8.
Introduction 1-5 2018
ST
AURORA
Introduction
Natural Hazard M itigation Plan
Exhibit 1-6
Map of DuPage County Municipalit ies
CAROL SlREAM
1-6
CHiCA
HlN_S{}AL
DOWNERS GROVE C~~*DOH
WESTMONT'" • ' .";
Y,,[\_~~K
Exh i bit 1-6 (Left)
Map of DuPage County
Townships
2018
Natural Hazard Mitigation Plan
Table 1-2
DuPage County Community In formation
Popu lation, 2010 Census Area in square miles NFIP
Community Home Number *CRS Incorporation
Name Total In Rule Participant Date Ou Page Area in
(FEMA, Tota l Other Popu lation DuPage 2016a) are a Area Counties
Addison, Village of 37, 198 37,198 Yes 170198 Yes 1884 9.98 9.98 0
Aurora, City of 197,899 49,433 Ye s 170320 Unknown 1857 45.80 19.65 26.15
Bartlett, Vill age of 41 ,208 24,411 Y es 170059 Yes 1891 15.86 10.85 5.01
Batavia , Village of 25,983 2,117 No 170321 Unknown 1891 9.70 0.53 9.17
Bensenville, Vill age of 18,352 18,352 No 170200 No 1884 5.62 5.41 0.21
Bloomingdale, Village of 22,047 22,018 Yes 170201 No 1889 7.04 7.04 0
Bolingbroo k, V illage of 73,366 1,571 Yes 170812 Unknown 1965 24.26 3.88 20.38
Burr Ridge, Village of 10,559 6,719 No 170071 No 1956 7.1 4 4 .69 2.45
Carol Stream , Village of 39,740 39,740 Yes 170202 No 1958 9 .42 9.42 0
Chicago, City of 2,707 ,123 2,703,466 Yes 170074 --1833 234.1 2 .41 231.7
Clarendon Hills, Villag e of 8,427 8 ,427 No 170203 No 1924 1.8 1 1.8 1 0
Darien, City o f 22,086 22,086 No 170750 No 1969 6 .30 6.30 0
Downers Grove , Village of 47,833 47,833 Yes 170204 Yes 1873 14 .45 14.45 0
Elk Grove Village , Village of 33, 127 0 Yes 170088 Unknown 1956 11.41 1.02 10.39
Elmhurst, City of 44, 121 44,121 Yes 170205 Unknown 1881 10 .3 1 10.28 0.03
Glendale Heights, Village of 34,208 34,208 Yes 170206 Yes 1959 5.5 1 5.51 0
Glen Ellyn , Village of 27,450 27,450 Yes 170207 Yes 1892 6.77 6.77 0
Hanover Park, Village of 37,973 17,337 Yes 170099 No 1958 6.4 3 3.38 3.05
Hinsdale, Village of 16,816 14 ,589 No 170105 No 1873 4.64 3 .71 0.93
Itasca, Village of 8,649 8,649 No 1702 10 No 1890 5.07 5.07 0
Lemont, Village of 16 ,000 10 No 170117 Unknown 1873 8.35 2.46 5.89
Usie, Village of 22,390 22,390 No 1702 11 Yes 1956 7.02 7.02 0
Lombard, Village of 43,165 43, 165 No 170212 No 1869 10.45 10.45 0
Napervill e, City of 141,853 94,533 Yes 1702 13 No 1857 39.32 29.0 1 10.31
Oak Brook, Village of 7,883 7,876 No 170214 No 1958 8.28 8 .27 0 .01
Oakbrook Terrace, City of 2 ,134 2 ,134 No 1702 15 No 1958 1.27 1.27 0
Roselle, Village of 22,763 19,040 No 170216 Unknown 1922 5.48 4 .81 0.67
St. Charles, C ~y of 32,974 543 Yes 170158 Yes 1834 14.93 1.17 13.76
Schaumburg, Village of 74,198 73 ,333 Yes 170330 Unknown 1914 19.33 0 .33 19
Villa Park, Village of 21,904 21,904 No 170217 No 1915 4.75 4 .75 0
W arrenville, City of 13, 140 13 , 140 Yes 170218 No 1967 5.62 5 .62 0
Wayne, Vi ll age of 2,431 1,570 Yes 170865 No 1958 5.87 3.16 2 .71
West Chicago, City of 27 ,086 2 7,086 No 170219 No 1873 15.14 15.14 0
Westmont, Village of 24,685 24,685 No 1702 20 No 1922 5.14 5.14 0
Whe aton, City of 52,894 52,894 Yes 17022 1 Yes 1859 11.44 11.44 0
Willowbrook , Village of 8,540 8 ,540 No 170222 Yes 1960 2.75 2.75 0
Winfield, Village of 9 ,080 9,080 No 170223 No 1921 3.03 3.03 0
Wood Dale , City of 13,770 13,770 No 170224 Yes 1928 4.84 4 .84 0
Woodridge, Village of 32,971 32,949 Yes 170737 No 1958 9.58 8 .94 0.64
Unincorporated DuPage Co. --97,758 --1701 97 Ye s 1884 97.35 97.35 0
Tota l s: 923,222 334
*Information obtained from the 2017 Natural Hazard Mitigation Plan Annua l Report
Introduction 1-7 2018
Natural H azard Mitigation Plan
Watersheds, Topography and Soils: DuPage County has six major watershed areas: Salt
Creek, the East Branch of the DuPage River, the West Branch of the DuPage River,
Sawmill Creek, the Des Plaines River Tributaries, and the Fox River Tributaries. Additional
information on watersh eds can be found in Exhibit 2-3 and Table 2-3. Th e northeastern
part of the County is drained by Salt Creek, which flows to th e south-south eas t. The
ce ntral part of the County is drained by the West and East Branches of the DuPage River,
which generally flow south. The southeast corner of the County is drained by the Des
Plaines Riv e rs, which flows to th e southwest. Th e northwest and southwest corners of the
County are drained by tributaries th at flow to the Fox River.
Most of the County topography is relative ly flat. The land surface elevation is highest in
the northwestern part of the County, and gradually slopes to the southeast. The high est
natural e l evation in the County is about 855 f eet above sea level at Mt. Hoy. The lowest
elevation is about 585 feet above sea level in th e Des Plain es River Vall ey at the
southeast part of the County.
DuPage County soils are predominately silt loam s and silty c lay loams. Portions of the
County are underlain by sand and gravel. Groundwater is available from one sha ll ow and
one deep aquifer system. The bedrock of DuPage County consists primarily of dolomites.
Cl i mate: DuPage County experiences four seasons (winter, spring, summer, and fall), with
an average of 189 sunny days per year (Best Places, N.D., P. 1), and occasionally seeing
large tempe rature changes from week to we ek. On average, the County receives 37
inches of rain and 26 inches of snow annually (Best Places, N.D., P. 1).
1.3 Planning Appro ach
This Plan reviews mitigation activities and selects those that will work best for DuPa ge
County and participating municipalities, agencies, and institutions. It provides ca refu lly
co nsidered directions to the County gove rnm ent and to the participating municipalities by
studying th e overall damage potential and ensuring that public funds are well spent. This
Plan was updated followed a 10-step process, based on the CRS program and taking into
consideration the FEMA's hazard mitigation planning process, o utlined within Exhibit 1-7.
The update was coordinated by the DuPage County Office of Homeland Security and
Emergency Management (OHSEM), DuPage County Stormwater Managem ent, and th e
DuPage County Building and Zoning Department, with assistance from the DuPage
County Department of Transportation, the DuPage County Public Works Department, and
Molly O'Toole & Associates, Ltd., a hazard mitigation planning consult ing firm.
Mitigation Wo r kgro u p: The first iteration of the Natural Hazards Mitigation Plan was
developed under the guidance of a Hazard Mitigation Workgroup, created by a resolution
of the DuPage County Board on August 8, 2006. The municipalities within DuPage County
were invited to participate. Interested municipalities passed a resolution stating their
commitment to the p l an development. The County updated the resolution formally
recognizing the Workgroup in 2012, with the second iteration of the plan .
In troduction 1-8 2018
Exhibit 1-7
Planning Process
l _~!Mf!Yl~.u~] mt
lllllli?I mt
•
N atural Hazard Mitigation Plan
Community
Rating System
Planning Process
Step one (1) of the planning pro cess was t o organize. The OHS EM and Stormwater
Management sought to increase participati on in the Workgroup by engaging current
members of th e Natural Hazard Mitigation Workgroup, municipal emergency
management coordinators, members of th e Stormwater Ordinance Administrator's
Workgroup, and publi c works officials appointed to the DuPage County Public Works
Directors Working Group throughout late 2016 and 2017. In December of 2016,
participants of the 2016 Natural Hazard Mitigation Annual Report were sent a survey
requesting input for the plan update. The survey inquired about the action items within
t he 2012 plan, provided ideas for potentia l co llaborative projects movi ng forward, asked
for the top five natural hazards the municipality faces, priority projects within the
community, and mitigation funding. A second survey was disseminated in September of
2017 to all municipal contacts reque sting similar information. The County OHSEM
engaged members of the DuPage County Loca l Emergency Managem en t Coordinators
Group in October 2017, and OHS EM and Stormwater Man agement engaged members of
the DuPage County Municipal Engineers Group (MEG) in Octob er 2017. At these
meetings, the purpose and update process for the Natural Hazard Mitigation Plan was
in troduced, the September 2017 survey was promoted, and first plan update meeting
was announced. Informat ion collected f ro m the surveys, and feedback from the
workgroup meetings, was used to establish the agenda for the Natural Hazard Mitigation
Plan Re-Write Kick-Off Meeting Agenda. This meeting was he ld on November 6, 2017 and
hosted by OHSEM, Stormwater Management, and the Building and Zoning Department.
All municipal representatives engaged throughout the processes previously outlined were
invited . In November 2017 , Municipal and County Workgroup participants no longer
employed with th e ir respective departments were removed and new individuals were
appointed from those engaged earlier in the year. A list of Workgroup members can be
found within Appendix A.
Public Involvement: Step two (2) of the planning process was to involve the public. In
November 2017, the County OHSEM estab li shed a Natural Hazard Mitigation section
within its Protect DuPage website, and shared by the Building and Zoning Department,
providing a place for the public to obtain information about the plan and the update
Introduction 1-9 2018
Natural Hazard Miti gation Plan
pro cess. This website wa s updated throughout the p lan ning process, a nd will continu e to
be u pdat ed throu ghout this Plan's life cyc le . The website in c luded: an overview with the
Plan purpose, history, and update process; meeting dates, times, and agendas; the
definition of hazard mitigation per the Federal Emergency Management Agency (FEMA); a
link to the 2012 plan; and l inks to the annual reports from t h e years 2014 to present.
In November 2017, th e OHSEM also deve loped and distributed a Publi c Input Survey.
Thi s survey was promoted via OHSEM's Facebook and Twitter page, a nd a llowed the full
month of December for responses. Municipalities were notified of the website and survey,
and were encouraged to share the information with their residents. For information on
the Public Input Survey fi ndings, see Appendix D. Th e survey, w hich collected 49
responses, aske d residents to identify:
• Th ei r jurisdiction (i.e . city, town, vi ll age, etc.);
• Natural hazards they or someone c lose to them had experienced within their
community and within la st 10 years;
• Hazards that most concern them when considering thei r fa m il y's health and
safety;
• Hazards that most co ncern th em when considering their community as a whol e;
• Th ei r feelings rega rd i ng community education a nd their level of pre paredness;
• Steps they've taken t o prepare for a natural disaster.
The OHS EM incorporated these survey findings int o t he plan. A draft plan was posted on
the Protect DuPage website, and made avai lable for public and municipal comme nt
through a survey, on Jan uary 2, 2018. In ad dition to th e Workgroup meetings being open
to th e pub lic, t h e County he ld a pub l ic m ee ting/ op en house on January 4, 2018 to
obtain input on th e draft and answer questions. A press release was provided to the
public by the County on December 29, and was promoted by the communities. Th e
Vi l lages of Lis le a n d Downers Grove a hosted a second p ublic meeting on January 10,
2018. This meeting was promoted by the County and other communities. See App endix B
press releases and soc i a l media po stin gs .
Coordination: Step three (3) was con du cted through out the planning process . The OHS EM
co ntacted ten County st akeholders asking for data or information re lated t o natura l
hazards -specifica lly flooding -including plans, studies, and/or current and expected
mitigation projects . In most cases , these agencies did not provide any information or
comments in respon se to this effort. Direct discussions with severa l of them did prove
he l pful. These age nci es we re given the opportunity to co mm ent on th e draft Plan .
Ch icago Metropolitan Agency for Planning (CMAP)
McHenry Cou n ty Emergency Management
Lake County Em erge ncy Man agemen t
National Oc eanic a nd Atmosp h eric Administra t ion (NOAA)
Nationa l Weath e r Service (NWS)
U.S . Army Corps of Engineers
National Flood Insurance Program (NFIP )
Federa l Emergency Manage ment Age ncy (FEM A)
Illi nois Emergency Management Agency (IEMA)
Am e rica n Red Cross of Greater Chicago
Introduction 1-10 2018
Natural Hazard Mitigation Plan
Existing plans and programs were reviewed throughout the planning process as well. It
should be noted that this Plan is intended to complement existing p lans or programs, and
does not repl ace other County or municipal planning efforts. Plans and progra ms
reviewed include:
DuPage County Capital Improvement Plan
DuPage County Strategic Plan
DuPage County Stormwater Management Annua l Report
DuPage County Stormwater Management Program Assessment
DuPage County Solid Waste Management Plan
DuPage County Emergency Operations Plan
State of Illin ois Natural Hazard Mitigation Plan
Lake County All Natural Hazard Mitigation Plan
McH enry County Natural Hazard Mitigation Plan
Cook County Multi-Jurisdictiona l Hazard Mitigation Plan
Chicago Metropol itan Agency for Planning Community Snapshots
Ill inois St at e Water Survey Topographic Wetness Index
Illinois Department of Natural Resources DuPage River Basin Inventory
U.S. Army Corps of Engineers DuPage River Feasibility Study
Haza r d Assessment: The Workgroup met for a second time on December 7, 2017 to
address step four (4), assess the ha zard. M eeti ng attendees discussed hazards identified
by the County: tornadoes, flood, severe summer storms to includ e li ghten ing, hail, high
winds, and microbursts, sever winter storms to include blizzards, extreme cold, and ice
storms, extreme heat, earthquakes, and drought. Specific emphasis was pla ced on
discussing repetitive loss areas, surface flooding identified within other stu d ies, and
historical damage from past incidents. Following their discussion, each participant
comp lete d a worksheet focusing on these seven hazards. The OHSEM developed the
worksheet to mirror the Illinois Emergency Management Agency's (IEMA} Threat and
Hazard Identification and Risk Assessment (THIRA}. Participants provided their
assessment of each h aza rd using eight categories:
Probability: Frequency : Frequency: Property
Probability: Likelihood Likelihood Likelihood Human Business Impact: Area Likelihood the hazard the hazard the hazard Impact: Impact: Potential Affected : the hazard w i ll occur for
w ill occur w i ll occur will occur multi ple Possi bility Potential for physical withi n the multiple of death or service w ithin the next 5 times in the times in the injury interruptions losses
next year next 5 andfor years next year years . damages
In providing their assessment for the first seven categories, participants used the
following percentages:
Introduction
Low= 1 % to 20%
Guarded = 21% to 40%
Elevated= 41% to 60%
High = 61% to 80%
Severe = 81% to 100%
1-11
Potential
incident
size
2018
Natu ral Hazard Mitigation Plan
For th e last category, participants id e ntified whether th e hazard would impact a single
community, multiple communities, or would affect the e ntire County. Following the
meeting, the OHSEM co ll ated all worksheet answers. The hazard data and Workgroup
findings are covered i n Chapter 2 of this Plan.
Th e December 7 meeting was mad e available to Workgroup partic i pan ts via conference
call. All virtual participants were allowed to engage in the hazards conversa tion, and
works heets from each a tte ndee wa s co ll ected via ema il after the conclusion of the
meeting.
Problem Evaluation: The Workgroup also addressed step five (5), eva luate the problem,
during th e December 7, 2017 me etin g. Meeting particip a nts were asked to split into
three groups to discu ss the potential impacts from the id entified hazard s within step four.
Participa nts attending via conference ca ll were plac ed with the smallest group and
allowed to participate through the phone. Each group was provided a list of topics to get
the discussion started. These topics were: l ife safety, public health, pu bli c outreach and
education, economic losses , partn erships, critical infrastructu re protection, cli mate
change, sustainable development, hi st o ri c preservation , natural resource protection,
cu ltural considerations, cost-effective projects, and public information and warning.
Workgro up members we re instructed to consider the t e rm "critica l infrastructure" to
inc l ude all of the 16 sect ors identified by the Department of Homeland Secu rity {O HS ):
chem i cal , commerc ial facilities, communications, critica l manufacturing, dams, defe nse
industrial base , eme rgency services, energy, financial services , food and agr iculture,
government facilities, healthcare and public health, information technol ogy, nuclear
reactors, materials and waste, transportation systems, and water and wa stewater
systems. When considering critical infrastructure, specia l emphasis was placed on critica l
facilities in hazard areas/ zones, power outages, dam and/or levee failure, and publi c
service interruptions.
Goal Development: Step s ix (6), set goa ls, was addressed through an exerc ise during th e
December 7, 2017 mee ting. Wo rk in g within the same groups from step five, meeting
participants utilized the talki ng points from step five to deve lop a minimum of three
priority goa ls. They were instructed t o comb ine topics and/or includ e new topics as
needed. The OHSEM utilized the products d eveloped within th e exercise to crea te
comp reh ensive goa ls and guid elin es for the plan. The Workgroup reviewed, revised, and
approved these goals -which can be found within Chapter 3 -during the January 4,
2018 meeting.
Mitigation Strategies: Step seven {7), review possible activit i es, was conducte d during the
Workgroup's third meeting on January 4, 2017. Working within three sma ll groups, the
Workgroup examined t he mitigation efforts from th e 2012 plan as outlin ed within the
action items, current mitigation efforts o utside of th e pla n, and then conside red a variety
of meas ures that could affect the impact of these ha za rd s. Special emphasis was placed
on co llaborative activiti es that would allow for multi-jurisd ictional parti cipation, projects
th at would allow for cost sharing and therefore wou ld be cost effective, and projects
invo lving sustainable deve lopment. Strategies were reviewed in re l ationship to the
deve l oped mitigation goals and th e CRS 's six m itigation categories , then prio ritized to
develop guidelines for comp leting the goa ls. To see th e prioritized guidelines, see Ch apte r
Introduction 1-12 2018
Natural Hazard Mitigation Plan
3. I n addition, the mitigation strategies served as a basis for the development of an
action plan. The mitigation strategies are the subject of Chapters 4 - 9 in this Plan. The
action plan may be found within Chapter 10. Mitigation activities discussed by the
Workgroup on January 4, 2018:
• Preventative: Encouraging the adoption of current bui lding codes.
• Property Protection: Requiring deeper foundations/ basements especially in
floodplain areas to prevent erosion, enforcement of sub-surface damn
improvements, and increase overhead sewer rebates.
• Natura l Resource Protection: Stream bank stabilization, better protection of wells,
enhance water quality by minimizing lead and copper levels, and urban forestry
programs (i.e . Tree City USA).
• Emergency Services : Mo re co l laboration wit h publi c sectors, to include more
frequent exercises (i.e . tabletops), safe rooms, Storm Ready certification ,
emergency generation, and enhanced communications.
• Structural Projects: Upgrade detention basins within floodplain areas, increase
downstream flood storage, and private damn stabilization repairs.
• Public Information: Siren messages, social media messages, utilization of
websites and newsletters .
Act ion Pla n: Step eight (8), draft an action plan, was conducted during an in-person
meeti ng, he l d on January 4, 2018, and a vi rtua l approva l process that took place f rom
January 9 to January 17. After the review of potentia l mit igation projects, the Workgroup
conducted an activity to devel op a draft "Action Plan" that specifies recommended efforts
and projects. Just as in the December meeting, the workgroup split into three smaller
groups. Each group was asked to identify action items that a l ign with the six mitigation
areas. Below are examples of action items discussed during the meeting:
• Identify the types of generation systems at critical facilities and if there is an
automatic switchover (i.e. if an electrician is needed to start the generated power)
• Increase communications capabilities for loca l pub lic works departments (i.e.
obta i n radios, des ignated frequency, etc.), and e nh an ce dai ly operationa l
communications between public works and emergency management; emergency
services.
• Participate in Storm Ready program.
• Participate in Tree City USA program.
• Participate in Community Rating System (CRS) program.
• Establish exercises for the workgroup focusing on hazard response,
communication , and documentation for reimbu rsement.
• Enhance coordination between emergency services and schoo l d istricts.
• Increase utilization of substantia l damage and substantia l improvement
requirements of the Countywide DuPage County Stormwater and Flood Plain
Ordinance.
The action items discussed within the meeting were collated by the OHSEM, and
additional County-wide initiatives were introduced to form the Action Plan that can be
found within Chapter 10. The Action Plan describes who is responsible for implementing
each m it igation measure, an estimate of cost of implementation, and the benefits of
Introduction 1-13 2018
Natural Hazard Mitigation Plan
implementing each action item . Th e Action Plan took into consideration the countywide
coordination that takes place through the Stormwater Ordinance Administrator's
Workgroup, the DuPage County Public Works Directors Working Group, and the Local
Emergency Management Coordinators Group.
It should be noted that this Plan serves only to recommend mitigation measures.
Implementation of these recommendations depends on adoption of this Plan by the
DuPage County Board and the city council or board of trustees of each participating
municipality. It also depends on the cooperation and support of the offices designated as
responsible for each action item. In addition, each community was encouraged to include
additional community specific goals and action items. Products that were provided to the
County prior to the draft submittal are in cluded within Appendix E.
Introduction 1-14 2018
N atural Hazard Mitigation Plan
References
American Fa ct Finde r . (2016). Selected Housing Characteristics 2011-2015 American
Community Survey 5-Year Estimates. Retri eved on: Dec embe r 15, 2017.
Retrieved from: https://www.census.gov/acs/www/d ata/data-tables-a nd-
tools/ data-profi les/2016/
American Fact Finder. (2017). Selected Economic Characteristics 2012-2016 American
Community Survey 5-Year Estimates. Retrieved on: December 7, 2017. Retrieved
from: https://www.census.gov/acs/www/data/data-tab les-a nd -too ls/data-
profi les/2016/
ArcGIS . (2015a). 2015 USA Median Hom e Values. Retrieved on: December 7, 2017.
Retri eved from:
https ://www.a rcg is.com/home/item.html?id=6083de6b153 f434e9de82dc94ce3
d033
ArcGIS. (2015b). 2015 USA Average Household In come. Retrieved on: December 7,
2017. Retri eve d from:
https://www.arcgis.com/home/item.htm l?id =ff5993795fcf4689b10dd30285d4
5328
ArcGIS . (2017a). 2017 USA Population Density. Ret rieved on: De cembe r 7 , 2017.
Retri eved from:
https ://www.a rcg is.com /home/item.html?id =b16d74fba48a49 19aacfaac2cd77e
5e5
ArcGIS. (2017b). 2017 USA Average Household Size . Retrieved on: December 7, 2017.
Retrieved from:
https://www.arcgis.com/home/item.html?id =e1be0f080b3f42cdb51d530db6a4
48f5
ArcGI S. (2017c). 2017 USA Median Hom e Values. Retrieved on: Decembe r 7, 2017.
Retrieved from:
https ://www.a rcg is.com/home /item.htm l?id=4267d9a 2d7d84a79907a46e93d2
8af01
ArcGIS. (2017d). 2017 USA Average Hou se hold Income . Retrieved on: Dece mber 7,
2017. Retri eved from:
https://www.arcgis.com/home/item.htm l?id =4b3e17633560425fa1f68a64a b1b
573d
Best Places. (N.D.) DuPage County, Illinois Climate. Retrieved on: December 7 , 2017.
Retrieved f rom: http://www.bestplaces.net/c li mate/county/illinois/dupage
Ch i cago Metropolitan Agency for Planning {CMAP). (2017, June). MetroPulse Community
Snapshot Data DuPage County. Retri eved o n: Decemb er 7, 2017 . Retrieved from:
http://www.cmap.illinois.gov/d oc um en t s/10180/102881/DuPage+-+ALL.pdf
Choose DuPage. (N.D.a) Business Climate . Retri eved on: Dec ember 15, 2017. Retrieved
from: http://www.choosed u page.com/business-climate
Choose DuPage. (N.D.b) Location. Retrieved on: December 1 5, 2017. Retrieved from:
http://www.choosed u page.com/location
Department of Hom ela nd Security (OHS ). (2017, December 8). What is Critical
In f rastructure? Ret ri eved on: December 15, 2017. Retrieved from:
https://www.dhs .gov/what-criti ca l-i nfra st ructure
Introduction 1-15 2018
Natural Hazard Mitigation Plan
DuPage County Office of Homeland Security and Emergency Management. (2017).
Hazardous Materials (HAZMAT) Plan, Hazard Specific Railroad Appendix.
Retrieved on: December 7, 2017.
Federal Emergency M anagemen t Agency (FEMA). (2016, August 23). Federal Emergency
Management Agency Community Status Book Report Illinois Communities
Participating in the National Flood Program. Retrieved on: December 18, 2017.
Retrieved from: https://www.fema.gov/cis/IL.html
Federal Emergency Management Agency (FEMA). (2017a, November 28). Hazard
Mitigation Planning. Retrieved on November 15, 2017. Retrieved
from: https://www.fema .gov/haza rd -mitiga tion-planning
Federal Emergency Management Agency (FEMA). (2017b, October 31). Hazard Mitigation
Plan Requirement. Retrieved on: December 15 2017. Retrieved from:
https://www.fema.gov/hazard -mitigation-p lan-requ ir ement
Federal Emergency Management Agency (FEMA). (2017c). National Flood Insurance
Program Community Rating System Coordinator's Manual. Retrieved on:
December 7, 2017. Retrieved from: https://www.fema.gov/media-library-
data/14939054 77815-
d794671adeed5beab6a6304d8ba0b207 /633300 2017 CRS Coordinators Ma
nual 508.pdf
Forest Pres erve District of DuPage County. (N.D.) This Land Is Your Land. Retrieved on:
December 15, 2017. Retrieved from:
http://www.dupageforest.org/about/preserving-open-s paces
Illinois Demographics. (N .D.). DuPage County Demographics Summary. Retrieved on:
December 7, 2017. Retrieved from: https://www.illinois-
demographics.com/ du pa ge-cou nty-demograp h ics
New York Tim es . (N.D.) 52 Water Systems in DuPage County, Ill inois. Retrieved on:
December 15, 2017. Retri eved from:
https://www.nytimes.com/interactive/projects/toxic-
waters/contaminants/il/dupage/ind ex.htm l
U.S. Government Publishing Office. (2011, January 7). 42 U.S.C. 5165 -Mitigation
Planning. Retrieved on December 15, 2017 . Retrieved from:
https://www.gpo.gov/fdsys/granule/USCODE-2010-title42/USCODE-2 010-title42-
chap68-subchaplll-sec5165
U.S. Government Publishing Office. (2013, October 1). 44 CFR 201.6 -Local Mitigation
Plans. Retrieved on: December 15, 2017. Retrieved from:
https://www.gpo.gov/fdsys/search/pagedetails.action?collectionCode=CFR&brow
sePath=Title+44%2FChapter+l%2FSubchapter+D%2FPart+201%2FSection+201.
6&granuleld=CFR-2013-title44-vol1-sec201-6&packageld=CFR-2013-title44-
voll&collapse =true&fromBrowse =tru e
Introduction 1-16 2018
Natural
Hazard:
Natural Hazard Mitigation Plan
Chapter 2 -Hazard Analysis
This chapter will discuss the natural hazards that cou ld i mpact DuPage County. A list of
potential hazards was reviewed and assessed by the Hazard Mitigation Workgroup on
December 7, 2017, and priority hazards were selected for ana lysis . For each hazard,
there i s a hazard and vu l nerability analysis . The hazard ana lysis includ es a description of
the hazard, past occurrences and damages, and li kelihood or probability of the hazard
occurring in the future. The vulnerability ana lysis compares the probability of the hazard
occurring against the possib le im pacts on resident hea lth and safety, includ ing warning
and evacuation, and property, including impacts to critica l infrastructure.
The Mitigation Workgroup met to discuss and prioritize natural hazard s id entified by the
County on Decemb er 7, 2017. The DuPage County Office of Homeland Security and
Emergency Management {OHSEM) collated the workgroup's information and produced an
overa ll DuPage County Natura l Hazard Assessment, which can be seen in Exhibit 2-1.
The following natural hazards were identified by the County, and will be t he subjects of
this chapter: tornadoes, f lood, severe summer storms to inc l ude lightening, hai l, high
winds, and microbursts, severe winter storms to in c lu de blizzards, extreme cold, and ic e
storms, extreme heat, earthquakes, drought, and ground failure. Ground fai l ure was
added to this chapter after the workgroup meetings conc luded, and is therefore not
included in the hazard ana lysis . For more information on t he Workgroup's ranking
process, see Chapter 1. For comparison, Exhibit 2-2 shows the State of Il linois's Hazard
Rankings for DuPage County {IEMA, 2013).
Ex hibit 2-1
DuPage County Natural Hazards
Probability:
Likelihood
the hazard
will occur
within the
next y ear
Probability: Frequency: Frequency: Human Business Property
Likelihood Likelihood the Likelihood the Impact: Impact: Impact:
the hazard hazard will hazard will Potential for
will occur occur multiple occur multiple Possibility Potential for physical of death or service within th e times in th e times in the injury interruptions losses and/or
next 5 years next year next 5 years damages
Severe Summer High High Low High Low Guarded Elevated Storm
Floods
Severe Winter
Storm
Extreme Heat
Tornado
Drought
Earthquake
High
E leva ted
El evated
Low
Low
Low
Severe
Storms
Hazard Analysis
High Low Elevated
High Low Elevated
Elevated Guarded Elevated
Low Low Low
Low Low Low
Low Low Low
Exhibit 2 -2
State of Illinois Hazard Rankin
Floods
Hi h
2-1
Low Low Elevated
Low Guarded Low
Low Low Low
Low Elevated Elevated
Low Low Low
Low Guarded Guarded
Tornado
Elevated
2018
Area
Affected:
Potential
incident
size
Multiple
Multiple
County
Coun ty
Multiple
County
County
Natural Hazard Mitigation Plan
Wildfires, levee failure, and dam failure have not been includ ed as hazards within thi s
Plan. The State of Illin ois does not conside r DuPage County to be at risk for a wildfire
(IEMA, 2013), and due to the County's high urban footprint, it has been exc luded . DuPage
County has experienced one f i re since 1950, occurring in Apri l 2003. The fire resu lted
from a larger fire that originated within neighboring Lake County. Approximately 100
acres of forest preserve was burned with no adve rse effects to structures or the
su rroundin g
com munities. Finally, Tab l e 2-1
while levees and dams DuPage County Natural Haza rd Frequency
Hazard Area affected or Past Frequency
have been includ ed
within this Plan as a
mitigation effort for
naturally occurring
riverine f looding, these
• Elements of severe
summ er storms potentially affected Last 5 years Last 10 years Last 30 years
are man-made
structures. Therefore ,
remain ing in alignment
wi th federal gu idance
(F EMA, 2013, P. 6),
DuPage County
considers levee or dam
fai l ure to be a
technologica l ha zard.
Drought
Earthquake
Extreme heat
Extreme cold
Flood occurrences
Hail*
Lightning*
Thunderstorm-
microburst*
Tornado
Winter Storm -Ice
Winter Storm -Snow
Countywide 9 --
Countywide 0 0
Countywide 0 2
Countywide 3 4
Countywide 14 19
S torm locat ion 32 56
Storm location 5 --
Storm location 26 56
Storm location 0 1
Countywide 0 0
Countywide 8 16
Whi le flooding ha s been the most significant natural hazard DuPage has experienced,
tornadoes, severe summer storms, and severe winter storms have all created damage
that has rece ived a f edera l disaster declaration over the past 39 years . Table 2-1 lists the
es timated frequency of each hazard within 5, 10 and 30 years. Tab le 2-2 lists the
presidential, or federal, disaster declarations for the County since 1967.
Table 2-2
State and Federa l Disaster Declarations for DuPage County
FEMA
Disaster Public
Fall Winter SorinQ Summer Declaration Date Number Location Assistance•
Tornado x 4/25/1967 227 Unknown Unknown
Flood x 9/5/1972 351 Unknown Un k nown
Flood x 6/25/1974 438 Unknown Un known
Flood x 9/13/2008 1800 Countywide $2,328,929
Flood x 7/24/2010 1935 Eastern Unknown
DuPaQe
Flood x 8/21/1987 798 Eastern Unknown DuPaQe
Severe Storms x 6/18/1976 509 Unknown Unknown
Severe Storms x 1/16/1979 3068 Unknown Unknown
Severe Stonns x 5/10/2013 41 16 Countywide Unknown
Severe Storms x 7/25/1996 1129 Western $2,460,000 Du Pa Qe
Winte r Storms x 1/8/1999 313 4 Countywide $2 ,300,000
Winte r Storms x 1/18/2001 316 1 Countywide $1,880,000
Winter Storms x 1/31/2011 1960 Countywide $3,041 ,412
• Dollar amount of oubli c assistance co mmunitie s received . Th is estimate does not include individual assistance orovid ed to indiv idu al orooertv own ers.
Hazard Analysis 2-2 2018
--
--
--
--
--
75+
--
86+
6
1
--
Natural Hazard Mitigation Plan
2.1 Floods
Acco rd ing to th e Nationa l Ocea ni c and Atmos ph eric Administration (NOAA), a watersh ed
is "a la nd area t hat cha nn e ls ra i nf a ll and snowme lt in to c reeks, strea ms, ri vers, an d
eve ntua lly to outflow points such as reservoirs, bays, and the ocean" (NOAA, 2017a).
There are six main watersheds in DuPa ge County: Salt Creek, the East Branch DuPage
River, the West Branch DuPage Ri ver, Sawmill Creek, Des Plaines River Tributaries, and
Fox River Tributaries. The watersheds associated with these streams encompass most of
DuPage County. Exhibit 2-3 shows the DuPage County watersheds. Table 2-3 lists DuP age
Co u nty's watersheds and s ub-watersheds. During times of high precipitation, or during a
J
Hazard Analys is
Exh ibit 2 -3
DuPage County Watershed Referenc e Map
DuPage County Watershed Referen ce Map
(
f
·' _,
2-3
J
... i -' -,~·
·\._. lfV'·•--
"l ........
2018
Natural Hazard Mitigation Plan
Tab le 2-3
DuPage County Wate rsh eds
Area Area
Watershed Tota l Within
Area DuPage Watershed Total Within
Area DuPage
County County
Sub-watershed Square Square
Miles Miies Sub-watershed Square Square
Miles M il es
Des Pla ines River Tributaries 39.60 38.51 Salt Creek 65.23 57 .92
A ddison Creek 9.09 9 .09 Bronswood Creek 3.27 3.27
B ense nville Ditch 2.56 2 .56 Devon Avenue 3.08 1.81
Black Partridge 2.73 2.43 Ginger Creek 5 .36 5.36
Crystal Creek 0.42 0.42 Oakbrook 1.20 1.20
Des Plaines Main Stem 7.82 7.79 Spring Brook 14.68 11 .82
F lagg Creek 11.89 11 .14 Salt Creek Main Stem 27.64 24.45
Willow Creek 5.09 5.09 Sugar Creek 4 .06 4 .06
DuPage River Tributaries 14.39 10.88 Westwood Creek 5 .95 5.95
Lily Cache 1.84 1.84 Sawmill Cr eek 12.55 12 .65
Spring Brook 2 12.55 9.03 Sawmill Creek Main Stem 9.48 9.48
East Branch DuPage River 81.29 75.22 W ards Creek 3.07 3.07
Armitage Creek 2.13 2.13 West Branch DuPage River 127.64 1 13 .15
A rmy Trail 0.44 0.44 Cress Creek 4 .21 4.21
Crabt ree Creek 1.54 1.54 Ferry Creek 12.38 12 .35
Tributary 1 0.67 0 .67 South of Foxtrot 0.92 0.88
Tributary 2 1.23 1.23 Kl ein Creek 12.65 12.65
Tributary 3 0.49 0.49 Kre ss Creek 18.93 15 .95
Tributary 6 1.85 1.85 Spring Brook 1 7 .69 7 .69
Tributary 7 0.86 0.86 Steeple Run 2.75 2.75
DuPage Rive r Mai n Stem 33.61 27.54 Tributary 1 2 .69 2 .69
Glencrest Creek 2.72 2.72 Tributary 2 4 .69 2.16
Glen Park 0.71 0 .71 Tributary 3 1.69 1.69
Lacey Creek 4.62 4.62 Tributary 4 2.95 2 .95
Prentiss Creek 7 .04 7.04 Tributary 5 1.37 1.37
Rott Creek 5.99 5.99 Tributary 6 1.21 1.21
St. Joseph Creek 11.26 11.26 T ributary 7 0.59 0.59
Swift Meadows 0.87 0.87 South of 87th 0 .77 0.04
22nd Street 0.77 0 .77 W est Branch Main Stem 42.54 34 .36
Willoway Bay 4.50 4 .50 Winfield Creek 8.47 8.47
Fox River Tributaries 28.08 28.08 W inding Creek 1.14 1.14
Brewster Creek 7.00 7.00
I ndian Creek 5.16 5.16
Norton Creek 6.56 6.56
Waubansee Creek 9 .36 9.36
rapid snowme lt, if "water enters th e wate rshed too quickly for the land to absorb" (NOAA,
N.D.a), causing "surfa ce runoff" f looding (NOAA, 2017). This overflow can a lso cause
wate r to "run onto and off of im pervious surfaces such as parking lots, roa ds, buildings,
and o ther structures", caus ing urban fl ood ing. Urban flood ing , as defin ed i n the Urban
Flooding Awareness Act, is "the inund atio n of property in a built environment, particularly
in more dense ly popu lated areas, cau se d by rainfal l overwhelmi ng th e capacity of
Hazard Analysis 2-4 2018
Natural Hazard Mitigation Plan
drainage systems, such as storm sewers. 'Urban flooding' does not include flooding in
undeveloped or agricultural areas. 'Urban flooding' includes (i) situations in which
stormwater enters buildings through windows, doors, or other openings, (i i) water backup
through sewer pipes, showers, toilets, sinks, and floor drains, (iii) seepage through walls
and floors, and (iv) the accumulation of water on property or public rights-of-way. Urban
flooding is characterized by its repet itive, costly and systemic impacts on communities,
regardless of whether or not these communities are located within formally designated
floodplains or near any body of water. These impacts inclu de damage to buildings and
infrastructure, econom ic disruption, and negative effects on health and safety (IDNR,
2015, P. 2).
"When surface water runoff introduced in to streams and riv ers exceeds the capacity of
the natural or constructed channels to accommodate the flow, water overflows the
stream banks, spilling out into adjacent low lying areas. Riverine flooding occurs as a
consequence. (FEMA, N.D.a)". Rivervine flooding can cause two types of floods: overbank
flooding and flash floods. Overbank flooding is the "increase in volume of water within a
river channel and the overflow of water from the channel onto the adjacent floodplain
(FEMA, N.D.a)". "Flash floods are the most dangerous kind of floods, because they
combine the destructive power of a flood with incredible speed and unpredictability. Flash
floods occur when excessive water fills normally dry creeks or river beds along with
currently flowing creeks and rivers, causing rapid rises of water in a short amount of time.
They can happen with little or no warning (NOAA, N.D.b)". Additionally, a levee or dam
failure can also produce a flash flood. Flooding is one of the most common natural
hazards that occur within DuPage County, and within the Country.
Probability and Frequency: On average, the County receives 37 inches of rain and 26
inches of snow annually (Best Places, N.D., P. 1). In DuPage County, a 24-hour
precipitation amount between 7 and 8 inches, depending on your location within the
County, is considered to be a 100-year ra infall event (NOAA, 2006). For a relatively short,
intense rainfall event of 3 hours, the 100-year rainfall amount is approximately 4.1
i nches (NOAA, 2006).
"DuPage County has grown dramatically over the last half decade. From 1950 to 2002
DuPage County saw a 600% increase in population alone. This rapid urbanization from
what was mostly agricultural land to la rge residential, commercial, and industrial areas
have had a profound impact on many of DuPage County's rivers and streams (DuPage
County, N.D.a)". DuPage County has experienced severa l major flood events over the past
30 years, the most notable events where overbank flood ing has occurred and damages
have been documented to be the following flood events which all were declared state
and/or federal disasters: August 1987, July 1996, September 2008, and April 2013.
Overbank flooding occurs when water rises overflows over the edges of a river or stream
and expands beyond the banks. This is the most severe type of flooding and can occur in
any size channel -from small streams to huge rivers.
In Lower Salt Creek, the most urbanized portion of DuPage County, overbank flo od ing
occurs quickly within a storm duration where the water surface eleva tion rises rapidly due
to the high percentage of impervious areas within this watershed, this stream description
is commonly termed "flashy" in addition to t he flood events listed above, the Salt Creek
Hazard Analysis 2-5 2018
Natural H azard Mitigation Plan
Watershed has been high ly impacted by the more extreme events that produce l ess
overa l l rainfall but occur over a short time duration (ie 4.25 inches of ra in in 6 hours).
The East Branch DuPage River watershed is less urbanized but the floodplain within this
watershed is extremely flat, therefore elevation rise in the stream has a broad
geographical expansion but is less like ly to be impacted by the smaller, more extreme
events the reg ion ha s been experiencing with climate change. Areas within this
watershed experience flooding from both overbank flooding and depressiona l flooding
(Urban Flooding). Because of the flatter topography within the East Branch DuPage River,
there often isn't a conveyance mechanism t o move water from the topographical
depression areas to the f loodp lain s . Due to this occurrence, areas outside of the mapped
floodpl ain are exp er iencing flooding due to this poor conveyance , this type of flooding is
also often termed as "urban flooding" within this region a nd has been documented to
occur at a higher freq uency than overbank flooding within the East Bran ch DuPage River
watershed.
The West Branch Du Page River watershed has the largest land area of the County's three
major watershed . In add ition to the large land area, it a lso has area s that are urbanized
th e refo re it a lso experiences urban f l ooding within the flatter areas outside of the
floodplain and overba nk flooding in large event. Du e to the large land area tributary to the
river, the "extreme" event result in a higher peak later in the event. Th is does allow for
emergency assistance for sandbagging, pumping and in some cases evacuation .
"In the late 1970s and ear ly 1980s the Federal Emergency Management Agency issued
Flood Insurance Rat e Maps (FIRM) that esta bl ished the 1% annual chance (100-year)
floodplains for DuPa ge County. The se and other FIRM s have since bee n rendered
obsolete due to changes in land use, topography, modeling standards and t ec hnologies
(DuPage Cou nty, N.D.a)". "The Stormwater [Management] has been conducting ne w
watershed studies that will conform to current topograph ica l conditions and meet today's
stan d ards and pra ct i ces in hydrolog ic and hydrau lic ana lysis (DuPage County, N.D.a)".
"The County is uniqu e in its deve lopment of the hydrol ogic and hydrauli c models used in
its watershed planning and flood plain mapping [and incorporating the County's flood
control fac il ities]. Rather tha n using single event, steady sta te models such as HEC1 and
HEC2, the Stormwater Management utilizes continuous sim ulation and dynamic routing
mod e ls. The reason s DuPage County se l ecte d this m etho do logy was; (1) the con tinu ous
simu l ation hydrologic mode l is used to capture the effect s of anteced ent moisture on
runoff vo lumes and peaks, and to account for a non -uniform precipitation distribution
over the watershed; (2) the effects of backwater, flood plain storage, and comp lex urban
st r eam systems have a significant impact on the hydraulics of DuPage County streams
(DuPage County, N.D.b)". Utilization of this system a ll ow for fl ood wa rn ings to be
distributed to communities and emergency operator to prepare for the pote ntial flood
event. This forecastin g is posted to th e County's public access webpage with stream
height predications a nd an updated blog to assist with data interpretatio n. I n addition to
this system, staff is a lso working on a rea l time inundation map to assist with emergency
response and coordination, this is exp ected to be "ro ll ed out " for countywide usage in July
2018.
Hazard Analysis 2-6 2018
N atural Hazard Mitigation Plan
Table 2-4 s h ows DuPage County's cu rr ent 100-yea r flood elevation ca lcu latio ns for
specific po ints a lon g major rivers, which a re included in th e FEMA Flood Insurance
Studies. Tabl e 2-5 provides additional ca l c ul ations, for specific locations, including flood
stage , 10-year flood, 50-year flood, and 100-yea r flood calculation s. Exh ibit 2-4 shows th e
Ch icago land region's susceptibility to urba n flooding (CMAP, 2017). This map s hows the
risk for floodin g outside of the FEMA mapped fl oodp la in. In st ead of proximity to floodpl ain
as the primary ri sk factor, this map uses age of development, base flood e levation
co m pared t o parcel e levation, combined sewer service areas, impervious cover, and soils
to determine how preva lent flooding -resulting f rom overwhelmed drai nage systems -
would be. Exhibit 2-5 shows th e Chicagoland region's sus ceptibi li ty to ri ver ine floodin g
(CMAP, 2017). This map shows flood i ng caused by streams and riv ers within the FEMA
mapped floodpl ain, which is the primary fo cus of hydraulic mod elin g. Exhibit 2-7 shows a
map of th e DuPa ge County 100-Year Flood Map. For additional in fo rmation on hazard
mapping, including f loo dplai n maps, see Chapter 4.
Exh ibit 2-4
Chicago Metro Area Urban Flooding Susceptibility Index
Urban Flooding Susceptibility Index
Combined F.requency
Ratio*· Urban _,
2
c::J 3
c=J 4 -5
'Combined Urban FR Includes : Age of
First Oo'iolopmen~ BFE . COmblnod
Sewer Serv ice Area&, IC, -and 1\\1
Accuracy assessment using validation data
Hazard Analysis 2-7
••... ·: . ...
206,234 33
244,497
255,748
286,967
262,258
88
185
457
1,867
Flood
Occurrence
(%}
3.3%
7.0%
17.4%
71.0%
2018
Natural Hazard Mitigation Plan
Exhibit 2-5
Chicago Metro Area Riverine Flooding Susceptibi l ity Index
Riverine Flooding Susceptibility Index
f .. '.
l ~r ' :· ,•' •
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I f j
I (
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\
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f
CoMb lned Frequency
Ratio* -Riverine
1
2
c=:J 3
c:=J 4 -5
•com1>111od RiYelfne F ~ Includes; >-00
ol First Oeve~pmol)I, Combine,d Sewer
Service Areas , eod lmperv oilS Cover
Acc uracy as se ssment usi ng validat ion data ••... ·: . ....
1_6,34S 33
14,251 60
3 14,774 196
~ 14,413 321
14,460 1,129
Table 2-4
Flood
Occu rrence
(%)
1.9%
3.5%
11 .3%
18.5%
64.9%
DuPage County 100-year Flood El evations
Rive r L ocation Approximate 100 -year
Fl ood Elevat ion
East Branch DuPage River Butterfield Rd (Rte. 56) 677.3 feet
East Branch DuPage River (downstream) DuPage-Will County Line 649.0 feet
Salt Creek North Avenue (Rte. 64) 672.6 feet
Salt Creek (downstream) DuPage-Cook .County Line 643.5 feet
West Branch DuPage Ri v er Lake Street (R te 20) 674 .5 feet
West Branch DuPage River (downstream) DuPage-Will County Line 646 .2 feet
Hazard Analysis 2-8 2018
Natural Hazard Mitigati on Plan
Tab le 2-5
DuPage County Comparison of Flood Elevations (In feet)
Stream 10-Year 50-100-Year year
East Branch DuPage River at 665.6 667.0 668.5 Rte 34 in Lisle
Salt Creek at North Avenue in 670.5 671.8 672 .6 Addison
West Branch DuPage River at 673.7 674.2 674.5 Lake Street near Bartlett
Exhibit 2-6
During a precipitation
or snowmelt event,
the County can use
their hydrologic and
hyd raulic modeling
sta t istics, in
coordination with their
rea l-t ime monitoring
DuPage County Rain and Stream Gage Locations
of r ain and stream
gages , to predict
Legend
• Raln G09415'l-
.6 Sllum 0.0-s .. ,;o,,
~
--_,MIJY..!..'!ta G
~
when and where
flooding will occur.
Exhibit 2-6 shows th e
locations of the
County's gages. Blue
dot s with numbers are
rain gage and stream
gage l ocations. Red
do t s with numbers are
ra in gages only.
-.---...-~ :z ~--o----li~-1-1------+--~·
Pa st Eve nts: Utilizing
information from the
National Weather
Service a nd OHSEM
report logs, Table 2-6
provides a su mmary
of a ll flood events that
have occu rred within
the County (excluding
loca li zed flooding)
from Jun e 1967 to
May 2016. A
historical summary of
damages from se lect
floods within Tabl e 2 -6 Is provided immediately following the table .
Hazard Analysis 2-9 2018
Natural Hazard Mitigation Plan
Ex hi b it 2 -7
DuPage County Revised Prel i minary DFIRM 100-Year Flood Map
FLOOD PRONE .AREAS ALONG: WATER WAYS:
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ti
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-
fl
fl
~ ~ 't"lt~p..>lff
t t>O'<l>J•I'(
Hazard Analysis 2-10 2018
Natural Hazard Mitigation Plan
Tabl e 2-6
DuPage County Record ed Flood Events
Loca tion: Date: Time : Description:
W estern DuPage 6/10/1967 Unknown Flooding in Winfi eld and W es t Chicago.
Cen tral and 8/27/1972 Un known Flood ing in Elmhurst. Residents in Glen Hill area in Glenda le Heig hts were evacuated in boats.
Eastern DuPaoe
W est and Centra l 4/18/1975 Unknown Flooding in Lisle, W infield and West Chic ago.
DuPaae
Eastern DuPage 3/5/1976 Unknown Flooding in Wood Dale.
Eastern DuPage 9/1911977 Unknown Flooding in Wood Dale .
Central DuPage 5/13/1978 Unknown Flood in g in Lisle.
Central and 3/411979 Unknown Flood ing in Lisle , Wood Dale .
Eastern DuPaqe
Western DuPage 3/19/1979 Unknown Flood ing in Winfield and West Chicago.
Eastern DuPage 12/3/1982 Un known Flooding in Elmhurst at Route 83 and North Avenue. 23 businesses in the are a received
maior damaaes· 3 with minor damaae.
W estern DuPage 12/2/1982 Unknown Flooding in Winfield and We st Chicago .
Central DuPage 7/2/1983 Unknown Flo oding in Lis le.
Countywide 8/1411987 Unknown Flooding th rough County.
South and Central 7/1711996 6:00 PM Damage est ima tes between S74 and S150 milli on.
DuPaae
South and Central 2/20/1997 6:00 PM
4 inches of rain in Aurora ; 3.6 inches of rain in W he aton . Woman died in Matteson after
DuPage driving into a barricaded fl ooded railroad viaduct.
Northeast DuPage 8/16/1997 6:00 PM 3 to 9 inches of ra in over northeast DuPage County into north-central Cook County.
Bolingbrook 8/3/1998 11 :00 PM 5 inches of rain in Will County; 3.5 inches in Bolingbrook . Roads with underpasses flooded .
Sou thwest DuPage 8/4/1998 11 :00 AM 6 inche s of rain in Bo li ngbrook and 5 inches in Naperv ille. Lisle experienced flood ing .
Wh eaton 7/21/200 1 7:35 PM 1 foot of water over Mai n Street in Wheaton.
Coun tywid e 10/13/2001 3:25 PM Numerous stree ts and major roads flooded and closed, including Route 53 where several
motorists were tr apped in the ir vehicles and had to be rescued.
Coun tywide 10/24/2001 1:30 PM Minor stree t flooding in DuPage.
Wheaton and West 7/9/2002 2:00AM 2.92 inches of rain in Wheaton 5.6 inches in Bata via. Street and basement fl ooding in
Ch icaao Wheaton and West Chicaao .
Carol Stream 8/2 212002 3:00AM Basement flooding in Carol Stream
Southeast DuPage 111412003 7:30 PM 2.4 inches of rain in Westmont; 1.68 inches in Wheaton . Low areas in Clarendon Hills flooded.
Clarendon Hills 3/28/2004 5:00 PM 1.5 to 2 inches of rain in 3 hours in Clarendon Hills.
Lisle 5/1312004 5:00 PM Flooding on Route 53 south of Burlington rai lroad traci<s in Lis le.
Naperville 5/21/2004 8:54 PM Washington Avenue and Route 34 flooded in Nap erville.
Central-we st Street flooding in Napervil le, Winfield , Clarendon Hills, and Wh ea ton . Pa rk and Main Streets
DuPage 5/30/2004 10:05A M in Wheaton closed.
Naperville 6/12/2 004 12 :25AM
River Road and Wil shire Blvd., and Route 59 and North Aurora Road in Naperville flooded ,
along with 59 th Street and Fairview Avenue i n Downers Grove .
Glendale Heights 10/2/2005 2:30 PM 1 foot of water over North Avenue in Glendale He ights .
Countywide 10/2/2006 8:50pm Underpasses were flooded and buildings took on water throug hout the County.
Countywide 9/13/2008 S:OOam Lowell and hurricane Ike moved across the region . These two features combined to produce
heavv rain and flash floodina across manv areas of northern Illinois.
Central DuPage 12/27/2008 Unknown Flood ing in Glen Ellyn and Lisle resulting in flood insurance claims
Th understorms developed in the late evening of July 23rd and lasted in the early morning
Countywide 7/24/2010 12:13am hours of July 24th producing very heavy rain and widespread flas h flooding in many parts of
the Chicago Metro Area. Rainfall rates were as much as two to three inches per hour .
North Ha lf of 7/1/2012 11 :00AM A Severe thunderstorm (equiva lent to 4-F2 Torn ados) stru ci< caus ing 56% of the County to
DuPage lose power for up to 7 days.
Countywide 4/1812013 4:00PM
This was a massive flood tha t activate d the DuPage EOC for (5) days and initiated a
Pres identia lly declared disaster, with Public and Ind ividual Assistance approval.
Countywide 8/22/2014 2:20AM W idescale flooding was experienced across the County.
Central DuPage 5/2512016 5:50 PM A severe thun derstorm struck Wheaton causing power outages .
Hazard Analysis 2-11 20 18
Natural Hazard Mitigation Plan
August 1987: On August 13 to 14, 1987, 3 inches to 9.4 inches of rain fell on DuPage
and Cook Counties. Four deaths were attributed to the flood. An estimated 400 vehicles
were stranded at depths as much as six feet. At least 30 intersections and stretches of
roadway were closed due to flooding. 3,000 homes were damaged. Total damage
estimates range from $75 to $150 million.
DuPage County suffered the worst damage in the Salt Creek watershed. The Village of
Addison estimated that 30% of the community was affected, and over 100 homes were
damaged. Businesses were significantly impacted, along with critical facilities, such as
treatment plants. Damage totaled to several million dollars.
In Elmhurst the southwest third of the City was impacted, 3,100 homes were damaged,
their wastewater treatment facility was flooded, and 3,500 phones were lost due to
submerged phone cables. Damage totaled over $33 million.
Flooding extended to Ute East Branch DuPage River watershed. For example, in Glendale
Heights several businesses flooded at the intersection of North Avenue (Illinois State
Route 64) and Glen Ellyn Road. In Wheaton, homes and businesses in the floodplain
were flooded, and City Hall was damaged. Also impacted were two water mains, storm
and sanitary sewers and a bridge abutment. Some businesses and schools were forced
to close due to the impact of the flood in the region.
July 1996: Beginning on July 17, 1996, rain from thunderstorms began to fall across
northeastern Illinois. Naperville reported that the first of the thunderstorms began around
10:00 a.m. By 7:00 p.m. Route 59 in Naperville was closed. The thunderstorms
continued into the next day. Record rainfall came from several thunderstorms that
tracked along a stalled west to east low-pressure front. Around 1:45 a.m. on July 18,
1996 the National Weather Service issued a flash flood warning. Around 2:00 a.m. By
6:00 a.m. the mayors of Naperville and Lisle declared a state of emergency. The County
worked to evacuate portions of Steeple Run subdivision in Lisle Township. The West
Branch DuPage River crested around 6:00 p.m. on July 18th.
The heaviest rainfall concentrated over southeastern Kane County and northeastern
Kendall County. An Aurora rain gage recorded 16.91 inches in 24 hours, a record for the
state. Record peak flows were recorded at 19 stream flow gages in the area. The US
Geological Survey estimated that the flooding was greater than a 100-year flood on
Blackberry Creek near Yorkville and the Fox River at Dayton.
The severity of the July 1996 flood was due to a combination of wet conditions (July was
the wettest month on record for Aurora) and heavy local rain. The Cities of Naperville and
Aurora were hit extremely hard. Naperville estimated total public damage at $2.2 m illion.
Private property damage was estimated at $30. 7 million. Many businesses were forced to
close temporarily. Downtown businesses with basements were adversely affected.
For the 1996 flood, the cost to the Village of Woodridge for response and clean-up was
$256,061. The flooding was village-wide. Homes and cars were flooded throughout the
village. Some businesses were closed temporarily. Woodridge also experienced
streambank erosion, sewer back-ups and street flooding. Total damages were not
recorded in the Village of Lisle, but the Village was reimbursed $28,590 by the Illinois
Hazard Analysis 2-12 2018
Natural Hazard Mitigation Plan
Emergency Management Agency for emergency response and recovery costs. In Downers
Grove an estimated 180 homes were damaged. Damage was estimated at $1,020,000.
September 2008: On September 13, 2008 major flooding was expe ri enced throughout
much of DuPage County . The severe storm and f lood event was a res ult of the remnants
of Hurricane Ik e that struck the Gulf coast and traveled up through the Midwest of the
United States. The Chicago area rainfall for September 13, 2008 set a new daily ra infall
record . As shown on the figure to the right, the northeast portion of DuPage County
received over six i nches of rain . Thirteen counties i n Illinois, including DuPage County,
received a federa l disaster declaration on October 3, 2008 (FEMA 1800-DR, Il linois) for
the severe storms and fl ooding.
From a survey of municipa lities (conducted for the 2009 Natural Hazard Mitigation Plan
An nua I Report), 30% of streets within severa l mun ic ipalit ies were impacted by the
September 13, 2008 flooding. Entrance and exit ramps of Interstates 290 and 88 were
affected , along with a notable number of major intersections in the northern and eastern
halves of the County. Eighteen commun iti es reported resi dentia l flooding, and nine
communities reported flooding in downtown or commercial areas.
Jul y and August 2010: During a period from Monday July 19th, 2010 through Saturday,
August 7th, 2010, severa l severe rain storms produced record rainfall totaling over 11
inches. This rainfa ll res ulted in serious roadway and residential flo oding throughout
DuPage County. Th e heaviest rain fell across north cen tra l DuPage County duri ng the
early morning hours of July 24th producing widespread flood ing and f las h flooding.
Widespread street and basement flooding was reported . North Avenue at Interstate 290
was flo oded with a car stuck in the water. Lake Ellyn overflowed its banks with six inches
or more of water covering nearby streets. The Village Links Golf Course was flooded with
waist high water and a mail truck was submerged in the flood waters. In Elmhurst,
Interstate 290 was closed near York Street with two cars floating in water at least four feet
deep; Rout e 83 was f looded and c losed under the Union Pacific tracks with seve ra l cars
f loatin g in the water; Robert Palmer Drive was f looded and closed be low the railroad trac k s
and a ll roads near Elmhurst Memorial Hospital were impassab l e. In Lombard, the Main
Street viaduct was flooded with stranded cars in the flood waters and 15 residents were
evacuated by boat a long Fin ley Road. In Vil la Park, significant flooding occu rr ed near
Wi l dwood and Monterey Avenues. Salt Creek quickly rose out of its banks and flooded
nearby areas. In the Graue Mill Condominiums, 250 resid ents were evacuated after four
feet of water surrounded the community when Salt Creek overflowed its banks. Storm total
rainfall amounts included 7.26 inches one mile northwest of Villa Park; 7.19 inches near
Caro l Stream; 7.08 inches one mile northwest of Glen Ellyn; 7.01 inches two miles west of
Elk Grove Village; 6.98 inches in Oak Brook; 6.92 inches one mil e northwest of Lombard;
6 .52 i nches near Wheaton; 5 .57 inches two and a half miles north of West Chicago; 4.51
inches two miles southwest of Burr Ridge; 4.40 inches one mile southeast of Westmont
and 3.45 inches in Lisle.
Throughout the entire event (including response and recovery) the DuPage County
Emergency Operations Center (EOC) conducted and facilitated conference ca ll briefings
with subject matter experts including the National Weather Service, DuPage County
Storm Water Department, FEMA and IEMA, to over 121 DuPage County stake holders.
Hazard Analysis 2-13 2018
Natural Hazard Mitigation Plan
Additionally, during the ongoing recovery phase of the disaster, the OHSEM facilitated
individual community damage assessment tours with FEMA, IEMA, and Small Business
Association (SBA). As a result of these meetings, DuPage County residents were able to
recover $17.5 million. Additional data can be found within Table 2-7 and Exhibit 2-8.
Table 2-7
DuPage County 2010 Flood Federal Reimbursement Totals
Individual Assistance:
Housing Assistance:
Other Needs Assistance:
Small Business Loans Approved:
Total Assistance Granted for DuPage County:
Exhibit 2-8
$7,228,007.12
$6,717,179.88
$510,827.24
$3, 116,400.00
$17,572,414.24
DuPage County 2010 Flood Federal Individual Assistance Applications
l
Hazard Analysis
FINAL INSTALLMENT
ELIGIBLE IA APPLICANTS by ZI P CODE OU PAGE COUNTY as of November 17, 2010
Sevete SlornB and floodlll{I FEMA.19.l5 ORll
2-14 2018
April 2013: In April 2013, flooding
occurred throughout DuPage County. The
East Branch of the DuPage River
experiencing record breaking flood depths,
the result of a severe storm. Rainfall
amounts of more than 6-inches (Exhibit 2 -
9) was recorded in 24 hours from a slow-
moving system, falling on pre-saturated
ground (DuPage County, 2013). Road
closures were required in Lisle, Downers
Grove and unincorporated DuPage;
including portions of Route 53, Maple
Avenue, Highland Avenue and 55th Street.
In Lisle, over 200 properties were flooded
along the East Branch DuPage River and
Natural Hazard Mitigation Plan
Exhibit 2-9
Northern Illinois Precipitation -April 2013
Multi-sensor Preclpilatlon : Observed (Inches)
7-0ay Period Ending th e Morn in g of 412 212 013
0 :• 100
e 8.0 IU 10 0
• 1).0108.0
• 501060
• 4 .0ro.5.0
0 30ln40
o 2 .~lu3.0
0 'Otn2 5
0 Utu2.U
e IOlo 1 .~
• 0751o 1 00
0 0.50 klO./~
• 0,5!<>050
O 010klU.2~
& 0.01 to0.10
0 < 0.01 (llol ~IU W ll)
0 l.fi$Sillg Oal3
St, Joseph Creek. Flood depths of 4 feet were recorded requiring rescues by boat. Lisle
estimated over $7 million in private, real property damage within the regulatory floodplain
and 113 flood insurance claims were paid. Over 500 vehicles were also lost, many
located in below grade parking structures.
The Tower of Four Lakes Villages apartment
complex suffered a reported $4 million in
damage due to flooding of the underground
parking garage, lobby, building's electrical
system , and elevators. Tower residents were
displaced due to the damage, finally
returning in June. Downers Grove
experienced flooding throughout the St.
Joseph Creek watershed, including
numerous residential structures and
downtown businesses. An overflow from a
detention pond in Westmont reportedly
overtopped a home's foundation flooding a
basement with enough force to tear
basement doors from their hinges. A
summary of all reported housing damage
from the event can be found in Exhibit 2 -10.
The DuPage County EOC was activated from
April 17 to April 19. During that time, the
OHSEM facilitated conference calls,
collaborated with subject matter experts, and
Exhibit 2-10
DuPage County Damage -April 2013
@
coordinated resource procurement and deployment to affected communities. A shelter
was established at Benedictine University, approximate ly 60 individuals utilized the
Hazard Analysis 2-15 2018
Natural Hazard Mitigation Plan
facility. Carol Stream, Naperville, Oak Brook, Bartlett, Downers Grove, Addison , and West
Chicago activated their EOC's on Apri l 18. During the recovery phase of the disaster, the
OHSEM facilitated individual community damage assessment tours with FEMA and I EMA.
As a result of these meetings, DuPage County as a whole was able to recover
approximately $17.6 million. Approximate ly 3,935 families qualified for Individual
Assistance, totaling approximately $14.7 million . And 26 communities, including DuPage
County, qualified for approximate ly $2.9 mil lion.
Other Flooding: While in-depth data similar to riverine flooding does not exist for urban
flooding, DuPage County Stormwater Management has collated all claims for urban
flooding from 2007 to 2014. This information can be found within Exhibit 2-11.
Hazard Analysis
Exhibit 2-11
DuPage County Urban Flooding Claims from 2007 to 2014
DuPage County Urban Flooding Claims
N
W ""-f;~....,_E
i I•; I ; I I I ~~--s
2-16
Number of Claimi by ZtP Cod• from 2007-2014
ro-!-00 -1000 ·WOO
500. 1000 -2000 .
2018
Natural Hazard Mitigation Plan
Life Safety and Public Hea lth: Safety and health concerns during a flood ra nge greatly.
One of the primary issues communi t ies experience, especia lly during flash floods, are
vehic l es getting stuck and/or swept away by rapid ly moving waters . These scenarios also
present danger to first responders and bystanders attempting to rescue ve hicle
occupants. "It's easy to misjudge the depth of fl oodwater, particularly at night. Sometimes
the br idge or road masked by fl ood wate r may have been undermined or completely
washed out (The Weather Channel, 2015)". According to the Federa l Emergency
Management Agency:
• "Six inches of water will reach the bottom of most passenger cars, caus ing loss of
contro l and potential stalling.
• A foot of water will float many ve hicl es .
• Two feet of rus hi ng water wi ll carry away most ve hi cles, including SUVs and
pickups."
(Th e We ather Channel, 2015}
Ju st as it is recommended for vehicles to stay away from sta ndin g and/or moving flood
waters, t he same is recomm ende d for ind iv idu a ls. Flood waters can be both unsanitary
and dangerous. According to Dr. Greg Forbes, a severe weathe r expert for The Wea ther
Channe l, water flowing at just 6 miles per hour (mph} can exert the same force as the
winds of an EF5 tornado (The Weather Cha nne l, 2015). And, wa t er moving at
approximate ly "25 mph has the pressure equivalent of wind blowing at 790 mph, fa ster
than the speed of sound" (The Weather Channe l, 2015}. When individua ls do get stuck
wit hin flood waters, some experience heart attacks and other medical conditions while
trying to free t hemse lves from the water.
Contact with flood waters can increa se the possibi lity of contract in g a communicable
disease (WHO, N.D., P. 1), and other medica l issues as a result of pollutants, chemicals,
waste, and a n in creased number of ins ect s (CDC, N.D.). When reced ing, flood waters can
also saturate the ground which leads to infiltra tion into sanit ary se wer lines. When
wastewate r treatment facilities are flooded, there is ofte n nowh ere for the treated
se wa ge to be discharged or inflowing sewage to be stored. Infiltration and lack of
treatment lea d to overloaded sewer l ines which bac k up into low-lying areas and some
hom es. Even though diluted by flood waters, raw se wage ca n be a breeding ground for
bacteria, suc h as E.coli, and other disease-ca using agents. Because of this threat,
tetanus shots are given t o people affected by a fl ood.
Stagnant water is often a perfect breeding ground for insects, specifically mosquitoes,
know n to ca r ry a nd distribute various types of diseases. Standing wate r also crea tes
mold, which can be a health issue to everyone, but is an ex treme hazard t o those with
breathi ng issues, chi ldren, and the elderly. If forced-air systems are affected by floods,
and are not subsequently cleaned proper ly, individua ls may i nadvertentl y breathe in
po llutants. If the water system loses pressure, a boil order may be iss ued to protect
peop le and an i mals from contaminated water.
The force of flood waters can damage gas l in es, which creates the potential for secondary
hazards s uch as gas lea ks and fires. This force, a long with st and in g water, can also
damage the structural integrity of bui ldings, which ca n cause injuri es if issues go-
unn oticed or unrepaired. While fires have not resulted from flooding within DuPage
Hazard Analysis 2-17 2018
Natural Hazard Mitigation Plan
County, history shows that floods ca n prevent fire departments and protect ion agencies
from successfully combating and sometimes eve n accessing a fire, all owing it to spread.
In add ition to the Nationa l Weather Servic e (NWS) flood warn ings and watches, DuPage
County maintains the ability to predi ct floodin g throughout the County, as previously
mentioned . Us in g these gages , the County can ass ist mun ic ipaliti es in determining if an
evacuation may be needed in the event of a seve re flooding scenar io.
Property Damage and Cr it ica l I nfrastructure: To exami ne t he exposure of bu i ldings t o
flooding, t he DuPage Coun t y Geographic In formation System (GIS) department, estimated
the total number .of bu ildings within in the 100-yea r floodplain. Approximately 2,895
buildings we re lo cated within the FEMA floodp la in, which represe nt a range of land uses.
Table 2-8 summari zes t he findings for buildin gs exposed to the 100-year flood event and
t he estimate of losses that co ul d occur. Note, th e esti mated va lu es are from 2012, usin g
2001 guidance from FEMA (FEMA, 2001). For residential structures, conten t s are va l ued
at 50 percent of th e build ing's va l ue . For non -residentia l structures, 100 percent is used.
These numbers are provided as a rough reference. Given the inc rease in property and
structure va lu es since 2012, a nd th at these numbers do not includ e eco nomi c losses,
and repairs to transportation and envi ronm ental infrastructure, it is esti mated that the
true va lue of losses from a 100-year flood wou ld be much greater.
Tabl e 2-8
Estimate of Vulnerable Structures within the DuPage County 100-Year Floodplain
Estimate o f
Building : Number o f Estimate of Estimate of 100-year Flood
Buildings: Structure Value: Contents Floodplain
Exposure:
Resid e nti al (90%) 2,605 $301,000 $150 ,5 00 $1.176 billion
Non-Res i dentia l 260 $2,500,000 $2,500,000 $1.130 b illion (9%)
Critical Facilities 29 $2 ,500,000 $2,500,000 $0.145 billion (1%)
Total 2 ,895 $2.421 billion
Repet itive Loss Properties: There are several diff erent definitions of a "repetitive loss
pro perty." Th e current FEMA definition of a repetitive loss property is:
"Repetitive Loss Stru cture : An NFIP-in sured structure th at has had at l east 2 paid
flood lo sses of more than $1,000 eac h in any 10-year period s inc e 1978." (FEMA,
2017a)
Additiona ll y, t he definitio ns of a severe repetitive loss bui ldi ng and severe repetitive loss
prope rty are:
"Severe Repetitive Loss Bu i lding: Any bui lding that:
1. Is covered under a Standard Flood In su rance Policy made ava ilable und er
this title;
Hazard An alysis 2-18 2018
Natural Hazard Mitigation Plan
2. Has incurred flood damage for which:
a. 4 or more separate claim payments have been made under a Standard
Flood Insurance Policy issued pursuant to this title, with the amount of
each such claim exceeding $5,000, and with the cumulative amount of
such claims payments exceeding $20,000; or
b. At least 2 separate claims payments have been made under a Standard
Flood Insurance Policy, with the cumulative amount of such claim
payments exceed the fair market value of the insured building on the day
before each loss" (FEMA, 2017a}.
"Severe Repetitive Loss Property: Either a severe repetitive loss building or the
contents within a severe repetitive loss building, or both" (FEMA, 201 ?a}.
'
1More than 2,100 properties across the U.S. enrolled in the National Flood Insurance
Program have flooded and been rebuilt more than 10 times since 1978, according to
a new analysis of insurance data by the Natural Resources Defense Council (NRDC} (Yale
Environment 360, 2016)". These severe repetitive loss properties "make up just 0.6
percent of federal flood insurance policies. But they account for 10.6 percent of the
program's claims -totaling $5.5 billion in payments (Yale Environment 360, 2016)."
FEMA encourages the mitigation of severe repetitive loss and repetitive loss properties
through distribution of mitigation grants, the NFIP's Increased Cost of Compliance
program and the Community Rating System (CRS} program. Depending on the number of
repetitive loss properties within a CRS community, the community may be required to
develop a specific plan to determine the causes of the repetitive claims and ways to
mitigate the causes for the repetitive claims. At a minimum, each CRS community must
conduct an annual outreach project to these properties advising the owners of their
location in the regulatory floodplain, property protection measures, any funding options
for property protection and flood insurance.
There are several FEMA programs that encourage communities to identify the causes of
their repetitive losses and develop a plan to mitigate the losses. These include the
Community Rating System (CRS} program, which as stated within Chapter one, this Plan
meets the requirements for. Based on an initial review of 1,546 paid insurance claims,
there are potentially 326 properties that at one time were repetitive loss properties in the
County. There are relatively few remaining repetitive loss properties in DuPage County
municipalities and the unincorporated areas. For additional information on repetitive loss
properties within DuPage County, see Chapter 5.
2.2 Severe Summer Storms
In this Plan, severe storms are considered to be thunderstorms, lightning events,
microbursts or damaging wind events, and hail storms.
Thunderstorms: "A thunderstorm is a rain shower during which you hear thunder. Since
thunder comes from lightning, all thunderstorms have lightning" (NOAA, 201 ?a}. "A
thunderstorm is classified as "severe" when it contains one or more of the fo llowing: hail
one inch or greater, winds gusting in excess of 50 knots (57 .5 mph}, or a tornado (NOAA,
Hazard Analysis 2-19 2018
Na tural Hazard Mitigation Plan
2017a)". "Th ree basic ingredients are required for a thun de rstorm to form: moisture,
rising unstable air (air that keeps r ising when g iv en a nudge), and a lifting mechanism t o
provide th e "nudge"" (NOAA, 2017a).
"Th e sun heats th e s urface of the earth, wh ic h warms the air above it. If this warm
surface ai r is forced to rise-hill s or mounta in s, or a reas where warm/cold or wetjdry air
bump together can cause rising motion-it will continu e to rise as long as it weighs less
and stays warmer t han the air around it. As the air rises, it transfers hea t f rom th e
su rface of the earth to the upper levels of th e atmosphere (the process of convection).
The water vapor it contains begins to coo l, releases th e heat, condenses and forms a
cloud. The cloud eventua ll y grows up wa rd into areas whe re the temperature is below
freez ing" (NOAA, 2017a).
"As a storm ri ses in to freezing air, different types of ice particl es ca n be c reated from
freezing li quid drops. The ice particles ca n grow by condensing vapor (like frost) and by
co llecti ng smaller liquid drops th at haven't frozen yet (a state called "supercoo led"). When
two ice particles co ll ide, they usu ally bounce off each other, but one pa rtic le can rip off a
little bit of ice from the other on e and grab some e lectric charge. Lots of these collisions
bui ld up big regions of e lectric charges to cause a bolt of li ghtning, which c rea tes th e
soun d waves we hear as thunder" (NOAA, 2017a).
Lightning: Lightnin g is a gian t spark of e lectricity in the atmo sphere betwee n clouds, th e
air, or th e ground. In the early stages of deve lop ment, air acts as an in s ulator between
the positive and negative c harges in th e c loud and between the c loud an d the ground .
When the opposite charges build up enough, th is insulating capacity of the air breaks
down and there is a ra pid discharge of electri c ity that we know as li ghtn i ng. The flash of
lightning temporarily equalizes the charged regions in the atmosphere u ntil t he opposite
charges build up again. (NOAA, 2017b)
Lightning can occur between opposite cha rges within the thund ersto rm cloud (intra -c loud
lightning) or betw ee n opposite charges in th e cloud and on the ground (cloud-to-ground
lightning). (NOAA, 2017b)
Lightning is one of the o ld est observed natural phenomena on earth. It can be seen in
vo l can ic eru ptions , extremely i ntense fo rest fires, surface nuclear detonations, heavy
snowstorms, in large hu rr icanes, and obviously, thunderstorms. (NOAA, 2017b)
Microbursts (Damaging Winds): A microb urst is a sma ll concentrated downburst that
produces an outward burst of strong wind s at or near th e surfa ce . Mi crob ursts are small
-l ess than 4 km ac ro ss -and s hort-lived, lasting only five to 10 minutes , with maximum
windspeeds sometimes exceed in g 100 mph . There are two kinds of microbursts: we t and
dry. A wet microburst is acc om pa nied by heavy precipitation at the surface. Dry
microbursts, commo n in places like the high plains and the intermoun t ain west, occur
with little or no preci pitation reach ing the grou nd . (NOAA, 2017c)
Hail Storms: Hail is a form of precipitation that occu rs when updrafts in thunderstorms
ca rry raindrops upwa rd into extrem e ly co ld areas of the atmosphere where they free ze
into balls of ice . Hail ca n damage aircraft, homes and cars, and ca n be dea dly to livesto ck
Hazard Analysis 2-20 2018
and people (NOAA, 2017c). Table 2 -9 outlines the potential
sizes of hail, and provides a description of physical items for
comparison (NOAA, 2017d).
Hailstones grow by colliding with supercool ed water drops.
Supercooled water will freeze on contact with ice crystals,
frozen raindrops, dust or some other nuclei. Thunderstorms
that have a strong updraft keep l ifting the hailston es up to the
top of the cloud where they encounter more supercooled water
and continue to grow . The hail falls when the thunderstorm's
updraft can no longer support the weight of the ice or the
updraft weakens. The stronger t he updraft the larger the
hailstone can grow (NOAA, 2017d).
"Hailstones can have layers like an onion if they travel up and
down in an updraft, or they can have few or no layers if they are
"balanced" in an updraft. One can tell how many times a
hailstone travel ed to the top of the storm by count ing the
layers . Hailstones can begin to melt and th en re-freeze together
-forming large and very irregularly shaped ha il " (NOAA, 2017d).
Natural Hazard Mitigation Plan
Table 2-9
National Weather Se rvice
Hail Descriptions
I Dtscrlptlon
I Pea
I
Marbleor
Mothball
!Penny or Dime
INIC!<el
lauarter
JHalf Dollar
!
Walnut or Ping
POO!l Ball
JGolfball
JHen's Egg
jTennlsBall
I Baseball
Jrea cup
!Grapefruit
[Sonball
I Diameter (Inches)
I 0.25
I 0.50
I 0.75
r-o.88
1.00
1.25
1.50
1.75
2.00
2.50
2.75
3.00
4.00
4.50
Past Events: During the July 6, 2003 hail event, 4,400 to 5,000 properties in Glendale
Heights suffered roof or siding damage from 2-inch hail. In the summer of 1992, a
microburst in Woodridge knocked down a wall under construction. Multiple injuries were
sustained with one fatality from falling debris. In November 2004, a wind event in
Woodridge cost the Village around $40,000 for the re mova l of tree debris.
In the June 2017, Itasca and Wood Dale experienced a microburst which encompassed
approximately 5 square m iles. DuPage County assisted in the respons e. In the end,
DuPage County Department of Transportation alone spent approximately 2,000 man
hours assisting in the recovery operation. With an approximate total of $35,000 spent
from DuPage County in equipment and man hours in three days. In theory, the local level
probably spent at least three tim es that amount. Exhibit 2-12 provides an estimate of the
costs incurred by DuPage County during th is incid e nt by category.
Hazard Analysis
g ;.1\(\(11) tA)
~ m.!-~.co s ;10,t'fll•(l()
H $7~~oo or.
6 ~5.l'~l}l)
~!,$1)..\flfl
Exhibit 2-12
DuPage County Assistance to Itasca, IL
DuPag e County R ~ou r c es & A ssets for Itas ca, IL
11111
01-H~' C !io l l 2~W f .J ~l:·!U:: E ~l C?11~ (t!!:!t.f
2-21 2018
Natural Hazard Mitigation Plan
Exhib it 2-13 summarizes severe wind and hail events within Northern Illinois from 2003
to July 2017 (NOAA, 2017e). Table 2-11 shows the top 10 states within the U.S . for hail
loss c l aims (NOAA, 2017e). Exhibits 2-14, 2-15, 2-16, and 2-17 outlin es information from
t he National Wea ther Serv ice database between January 1, 1997 and December 1, 2017
for the severe types of storms l ist ed in this plan within DuPage County (NOAA, 2017e}.
Exh ibit 2-13
Northern Illinois Record Wind/ Hail Events
July 19-23, 2017: Multiple rounds of heavy rain producing stomts bring flooding & areas o f wind
damage
June 14, 2017: Storms bring scattered wind damage and near three Inches ofraln to parts of
northern IL
May 15, 2017: Hall to golf ball s ize In the Rockford Area
Ma rch 7, 2017: Early season line of sto11ns b1·lngs strong winds
July 21-24, 2016: Humid and hot weather brings multiple days of storms, with scattered wind
damage In Chicago and flash flooding In Belvidere
May 25, 2016: Isolated wind damage and locally heavy rainfall
August 10, 2015: Severe mlcrobu1·st In Glen Ellyn, IL; the role of boundaries In severe weather
Aui1J st 2. 2015: Large hall In DeKalb, IL and damaging winds In Wood Dale and Evanston, IL
June 8, 2015: Many hall-producing stomts, Including up to golf ball size
May 30, 2015: Cold and w indy with heavy rainfall & high waves
June 30. 2014: Widespread wind damage across northern IL & northem IN w ithin t he second of two
derechoes
hme 21. 2014: Damaging winds & heavy rainfall event
May 20, 2014 : Baseball size hall In Chana, IL & damaging winds in DeKalb, IL
May 11. 20'14: Scattered large hall & damaging winds
Aprll 12. 2014: Large hall up to golf ball size In the 11011h Chicago metro
Auiust 30, 2013: Severe storms Impact the nol'th Chicago metro
August 4. 2012: Severe wind producing complex of storms with thousands ofllghtnlng strikes
crosses area
July 26. 2012: Down burst over O'Hare lnternat lonal All'port brings 70 mph gust
May 3 -4, 2012: Hall and heavy rain across Chicago
July 11. 2011: Oerecho brings wtdespl'ead wind damage to northern IL, lnchtdlng six lnfurtes In
Palos Heights, IL
June 18, 2010: Two bow echoes with severe winds move across the are a
hme 19. 2009: Widespread hall, winds, and flooding across northern IL
July 25. 2007: Micro bursts In Burr Ridge & Homer Glen, IL In Cook County
March 31. 2007: Mlcroburst in Carol Stream & Glendale Heights, IL In DuPage County
May 18 & 20, 2004: Multiple severe weather episodes across northern IL & northwest IN
luly 27 . 2003: Damaging winds & heavy rain across the far southwest & so uthern suburbs
lul y 6. 2003: Golf ball size hail In Buffalo Grove & Carol Stream, IL
Table 2-11
Hail Loss Claims by Top 10 States in U.S. (66% total )
.Hall Loss Cla l ma 2013 • 2015: Toi _ 10 t:fall_'Loss States
State 2_01~ 2014 '2 015 roU..t $t;te % of us Hill .cratm tota l'
Texa s 122 005 134 028 138 539 394 572 19%
Colorado 32741 99 565 60 285 182 591 9o/o
Nebraska 45 860 80 293 22193 148346 7%
Kan sas 52 404 39 222 36 337 127,963 6%
llllnols 24 002 63 723 32 788 120513 6%
Oklahoma 60131 11 760 26 302 98193 6%
Missouri 14 703 45 264 34 953 94920 4 % .
Minnesota 45860 16688 30641 93189 4 %
South Dakota 27,819 30634 16428 74,88 1 4 %
lndlan a 30,733 21,996 12,652 65,281 3o/o
VeatlvToo 10 State Totals 4~25 8 543173 401 018 1-400449
ToD 10 : % of Yaarlv Total 63 % 86Y1 70% 66%
Ha z ard An alysis 2-22 2018
Natural Hazard Mitigation Plan
Exhibit 2-14
Nationa l We ather Service Thunderstorms a nd Damaging Wind Ev ents
I Number of County/Zone areas affected :
I
Number of Days with Event:
Number of D ays w ith Event and Death:
I Number of Days w ith Event and Death or Injury:
I Number of D ays with Event and Property Damage:
I Number of Days with Event and Crop Damage:
I Number of Event Types reported :
L
Exhibit 2-15
National Weather Service Lightning Events
J N umber of County/Zone areas affected:
J N umb~r of Days ~ith Event:
l Number of Days with Event and Death:
I N umber of Days with Event and Death or Injury:
[Numbe~~~ys with Ev ent and Property Damage:
I Number of Days with Event and Crop Damage:
J Number of E~ent Types reported :
Exhibit 2-16
National Weather Service Hail Events
[Number of County/Zone a reas affected:
Number of Days with Event:
Number of Days with Event and Death:
~ -
Number of D ays with Event and Death or Injury:
Number of Days with Event and Property Damage :
Number of D ays with Event and Crop Damage:
Number of Even t Types report ed:
Exhibit 2-17
National Weather Service Ha i l Events
Number of County/Zone areas affected :
Number of Days with Event:
Number of Days with Event and Death:
Nu mber of Day s with Event and Death or Inju ry :
Number of Days with Event and Property Damage:
Number of Days with Ev ent and Crop Damage:
Number of Event Types reported:
1
87
2
\9
123
0
11
11
1:·
J3
j 15
Jo-
11
11
J74
Jo
0
0
0
11
74
0
0
lo
lo
I 1
Probability and Frequency: The DuPage Coun ty area averages 5.8 th understorm events
each year with winds in excess of 50 mi l es per hour. They ave rage a n hou r in duration. It
is estimated that only five storms each year have the hailstorms and high winds to be
considered a severe t hunderstorm. Assuming the average severe storm affects 100
Ha zard Analysis 2-23 2018
Natural Hazard Mitigation Plan
square miles, the odds of a severe thunderstorm hitting any particular square mile in
DuPage County are 1:1or100 percent. Based on the data collected for this plan, it is
reasonable to assume the probability for these types of storms to happen in the future is
high. Not all of these storms amount in death, but the damage of these storms is
measurable.
life Safety and Public Health: The threat to life and the cause of death vary by the type of
storm. Exhibits 2-14, 2-15, 2-16, and 2-17 provide injury and death information from
severe summer storms that occurred between January 1, 1997 and December 1, 2017
within DuPage County (NOAA, 2017e).
Property Damage and Critical Infrastructure: As with tornadoes, mobile homes are at a
high risk for damage from thunderstorms, because of their lightweight building
construction and vulnerability to flying debris. (Insurance Institute for Business & Home
Safety, 2017). Wind and water damage can result when windows are broken by flying
debris or hail. Lightning can cause direct damage to structures (especially those without
lightning protection systems) and can cause fires that damage forests and structures.
If you divide the County's total number of housing units, 305,016 (American Fact Finder,
2016, P. 1), by the County's total square miles, 334, the County's housing density is
approximately 1,069 homes per square mile. If a severe summer storm impacts a 100-
square mile area of the County, then approximately a third of the of the County would be
affected (DuPage County area equals 334 square miles). If 1 percent of the homes in that
area were subject to damage, based on the average home price in DuPage County
(ArcGIS, 2017), then the vulnerability of DuPage County buildings would be
approximately:
(100 square miles x 1,069 housing units per square mile x $304,449 per home) x 1% =
= $325.45 million in property value exposed
Critical facilities are susceptible to the same damage and disruption from thunderstorms
as other buildings. Emergency operations can be disrupted as thunderstorms and
lightning affect radio communications and antennas are a prime target for lightning. To
date, there is not record of critical facilities in DuPage County having incurred any
damages due to severe storms.
Thunderstorms can impact transportation and utilities. Automobiles and their windshields
are subject to damage by hail. Power lines can be knocked out by lightning or knocked
down by wind and debris. In Addison, at Lake Street and 4th Avenue, a billboard was
damaged due to high winds on March 31, 2006. Repair costs were in the tens of
thousands. Lightning can also cause power surges that damage appliances, electronic
equipment and computers. Cost of clean-up by towns can add up.
2.3 Severe Winter Storms
The Illinois Emergency Management Agency defines a severe winter storm as a storm
that meets one or more of the following criteria (IEMA, 2013, P. 159):
• "A snowstorm that produces six inches or more of snow within 48 hours or less,
Hazard Analysis 2-24 2018
Natural Hazard Mitigation Plan
• An ice storm in which 10 percent of the cooperative National Weather Service
stations in Illinois report glaze, and/or
• A snowstorm or ice storm in which deaths, injuries, or property damage occurs."
(IEMA, 2013, P. 159)
"A winter storm is an event in which the main types of precipitation are snow, sleet or
freezing rain" (NOAA, 201 ?f). "Blizzards are dangerous winter storms that are a
combination of blowing snow and wind resulting in very low visibilities. While heavy
snowfalls and severe cold often accompany blizzards, they are not required. Sometimes
strong winds pick up snow that has already fallen, creating a ground blizzard" (NOAA,
2017f). "An ice storm is a storm which results in the accumulation of at least .25" of ice
on exposed surfaces. They create hazardous driving and walking conditions. Tree
branches and powerlines can easily snap under the weight of the ice" (NOAA, 2017f).
"Lake effect storms are not low-pressure system storms. As a cold, dry air mass moves
over the Great Lakes regions, the air picks up lots of moisture from the Great Lakes. This
air, now full of water, dumps the water as snow in areas generally to the south and east
of the lakes" (NOAA, 2017f). "Snow squalls are brief, intense snow showers accompanied
by strong, gusty winds. Accumulation may be significant. Snow squalls are best known in
the Great Lakes region" (NOAA, 201 ?f).
"Just like any other storm at other times of the year, the right combination of ingredients
is necessary for a winter storm to develop" (NOAA, 201 ?f): Three essentials are
necessary to make a winter storm:
• "Cold air. Below freezing temperatures in the clouds and near the ground are
necessary to make snow and/or ice.
• Lift. Something to raise the moist air to form the clouds and cause precipitation.
An example of lift is warm air colliding with cold air and being forced to rise over
the cold dome. The boundary between the warm and cold air masses is called a
front. Another example of lift is air flowing up a mountainside.
• Moisture. To form clouds and precipitation. Air blowing across a body of water,
such as a large lake or the ocean, is an excellent source of moisture."
(NOAA, 201 ?f)
Extreme Cold: While there is no official definition of extreme cold, it is generally
considered to be temperatures that subject the body to frostbite and hypothermia.
Additional information on these conditions can be found on page 2-30.
Snow: "Most precipitation that forms in wintertime clouds starts out as snow because the
top laye r of the storm is usually cold enough to create snowflakes. Snowflakes are just
collections of ice crystals that cling to each other as they fall toward the ground.
Precipitation continues to fall as snow when the temperature remains at or below 0
degrees Celsius from the cloud base to the ground" (NOAA, 201 ?f).
• "Snow Flurries. Light snow falling for short durations. No accumulation or light
dusting is all that is expected.
• Snow Showers. Snow falling at varying intensities for brief periods of time. Some
accumulation is possible.
• Snow Squalls. Brief, intense snow showers accompanied by strong, gusty winds.
Accumulation may be significant. Snow squalls are best known in the Great Lakes
Region.
Hazard Analysis 2-25 2018
Natural Hazard Mitigation Plan
• Blowing Snow. Wind-driven snow that reduces visibility and causes significant
drifting. Blowing snow may be snow that is falling and/or loose snow on the
ground picked up by the wind.
• Blizzards. Winds over 35mph with snow and blowing snow, reducing visibility to
1/4 mile or less for at least 3 hours.
• On average, thirteen inches of snow equals one inch of rain in the US, although
this ratio can vary from two inches for sleet to nearly fifty inches for very dry,
powdery
snow under Exhibit 2-18
certain
conditions."
(NOAA,
2017f)
Exhibit 2-18
provides an
illustration on how
snow is formed
(NOAA, 2017f}.
Sleet: "Sleet occurs
when snowflakes
only partially melt
when they fall
through a shallow
precipitation falls as
SNOW
How snow is formed
when air temperature remains below
freezing throughout the atmosphere ~ .'
0°C T>O"C
layer of warm air. These slushy drops refreeze as they next fall through a deep layer of
freezing air above the surface, and eventually reach the ground as frozen rain drops that
bounce on impact (NOAA, 2017f)." "Sleet falls when snowflakes partially melt as they fall,
and then refreeze before they reach the ground (NOAA, 2017f)." Exhibit 2-19 shows how
sleet is formed (NOAA, 2017f).
Freezing Rain: "Freezing rain
occurs when snowflakes
descend into a warmer layer of
air and melt completely. When
these liquid water drops fall
through another thin layer of
freezing air just above the
surface, they don't have enough
time to refreeze before reaching
the ground. Because they are
"supercooled," they instantly
refreeze upon contact with
anything that that is at or below
0 degrees C, creating a glaze of
ice on the ground, trees, power
lines, or other objects. A
significant accumulation of
snow
partly metted snow
Exhibit 2-19
How sleet is formed
freezing rain lasting several hours or more is called an ice storm (NOAA, 2017f}."
Hazard Analysis 2-26 2018
Natural Hazard Mitigation Plan
Exhibit 2-20
provides an
illustration on how
freezing rain is
formed (NOAA,
2017f).
Forecasting:
"Accurately
forecasting winter
weather is a
complicated
process. It starts
with a wide network
of observing
systems such as
satellites, Doppler
Exhibit 2-20
How freezing rain is formed
snow
snow melts completely
radars and automated surface observing systems. Computer forecast models take this
information and estimate what will happen next. Forecasters then use their experience to
write and issue forecasts" (NOAA, 2017f).
"Knowing the climatology for a given area is very important to be able to forecast winter
weather. Severe Winter storms come in different sizes and are created by different
combinations of atmospheric conditions and local geography" (NOAA, 2017f).
When snow, or the potential for snow, is detected by the National Weather Service (NWS),
several types of winter weather notices can be issued:
"Blizzard Warning: Issued when winds of 35 mph or greater are combined with
blowing and drifting snow with visibilities of Y4 mile or less. Seek indoor shelter
immediately and stay indoors until the severe conditions end.
Winter Storm Warning: Issued when a combination of hazardous winter weather in
the form of heavy snow, heavy freezing rain, or heavy sleet is imminent or
occurring. Winter Storm Warnings are usually issued 12 to 24 hours before the
event is expected to begin.
Winter Storm Watch: Issued 12-48 hours in advance of the onset of severe winter
conditions. The watch may or may not be upgraded to a winter storm warning,
depending on how the weather system moves or how it is developing.
Winter Storm Outlook: Issued prior to a Winter Storm Watch. The Outlook is given
when forecasters believe winter storm conditions are possible and are usually
issu ed 3 to 5 days in advance of a winter storm.
Winter Weather Advisories: Issued for accumulations of snow, freezing rain,
freezing drizzle, and sleet which will cause significant inconveniences and, if
caution is not exercised, could lead to life-threatening situations.
Hazard Analysis 2-27 2018
Natural Hazard Mitigation Plan
Lake Effect Snow Warning: Issued when heavy lake effect snow is imminent or
occurring.
Lake Effect Snow Advisory: Issued when accumulation of lake effect snow will
cause significant inconvenience.
Wind Chill Warning: Issued when wind chill temperatures are expected to be
hazardous to life within several minutes of exposure.
Wind Chill Advisory: Issued for a wind chill situation that could cause significant
inconveniences, but do not meet warning criteria. Criteria for issuing Windchill
Warnings and Advisories are set locally.
Dense Fog Advisory: Issued when fog will reduce visibility to% mile or less over a
widespread area.
Snow Flurries: Light snow falling for short durations. No accumulation or light
dusting is all that is expected.
Snow Showers: Snow falling at varying intensities for brief periods of time. Some
accumulation is possible.
Blowing Snow: Wind-driven snow that reduces visibility and causes significant
drifting. Blowing snow may be snow that is falling and/or loose snow on the
ground picked up by the wind" (NOAA, 2017f).
Past Events: Recorded [severe] winter storm events are shown Table 2-12 (NOAA,
2017g).
January 1999: The January 1999 snow event blanketed the entire County. In Naperville,
11 inches of snowfall was recorded. The event brought a federal disaster declaration.
DuPage County spent $187,000 over their regular costs. Woodridge spent over
$102,000, Downers Grove spent over $44,000, and Wheaton over $82,000. Elmhurst
spent over $90,000 and Lisle over $40,000.
December 2000: December 2000 snow event cost Elmhurst $74,000, Lisle $21,500,
and Wheaton $51,103. Numerous deaths of people had been recorded for people
suffering heart attacks following snow shoveling.
February 2007: Heavy snow fell across northern Illinois on February 13th with some
areas receiving over one foot of snow. In addition, wind gusts were frequently blowing at
or above 35 mph, creating blizzard and whiteout conditions across many areas.
Willowbrook measured 11.8 inches of snowfall, Oak Brook measured 11.0 inches of
snowfall, Winfield measured 10.5 inches of snowfall and Wheaton measured 10.1 inches
of snowfall.
Hazard Analysis 2-28 2018
Natural Hazard Mitigation Plan
January and February 2011: Between January 31 and February 3, 2011, Northern Illinois,
including all of DuPage County, experienced heavy snowfall. Most areas in DuPage
Table 2-12
DuPage County Recorded Winter
Events
1/9/1997 Winter Storm
1 1/1 §/1997 J!Yinter Storm
3/9/1998 Heavy Snow
1 /111 ~99 Lt:!.eavy -~now
~{~/1_ll9§! .. t!e§IVY S !!O~
3/8/1 _99~ Heavy Snow
2/18/2000 Heavy Snow
1211112000 I Blizzard--~ 1 /30/2002 [ Winter Storm I ;3/2t2ooL[ W inter Storm
, 3/4/2003 I W inter ~torm
i--1!412004 _tleavy _§now
I 1/4/2005 Heavy S~.c...ow __ _
I 1/21/2005 l Heavy Snow
12/8/2005 Winter Storm
_ !@.0/200tl_ Winter Storm
~ 11 /~Q/2006 Winter Storm
1 12/1/2006 Winter Storm
21312007 Extreme Cold/wind Chill
2/13/2007 Blizzard
2/25/2007 Winte r Storm
1 /29/2008 Winter Storm ----1 /31 /2008 Winter Storm
2/1 /2008 Winter Storm _...__ -------
~/5/2008 Winter Storm
211012008 E xtreme Cold/wind Chill -----------
f 2/25/2008 Winter Storm
3/21/2008 Winter Storm
r 1271 8/2008 Winter Storm ----
12/21/2008 Extreme Cold/wind Chill
1/9/2009 Winter Storm ------------
1 /15/2009 Extreme Cold/wind Chill
2/5/2009 Extreme Cold/wind Chill ----12/26/2009 Winter Storm
1m2010 Winter Storm
~ 2/8/2010 Winter Storm
I 12/11/2010 Winter Storm
I 2/1/2011 Blizzard
I 111. 2_12012 1 IM"-~e-r S-_!o-rm-
1 /20/2012 Winter Storm --------
2/26/20!_3 Heavy Snow _
3/5/2013 , Winter Storm
!£..4{2011 I _8_~yy Snow_ . . . .
1/6/201~ s_xtreme Cold/V!lnd Chill
1/27/2014 Extreme Cold/wind Chill
2/1 /2014 He<!Yy ~now
2/4/2014 Heavy Sno~
2/17/2014 Heavy Snow
1 /8/2015 I Extreme Cold/wind Chill
2/1 /2015 He~vy S119w
11 /20/2015 Heayy Snow
12/4/2016 Heavy Snow
Hazard Analys is
County received over 20 inches of snow. O'Hare and
Midway airports reported totals of 21.2 and 20.9 inches,
respectively. Both airports were closed for several days.
Peak wind gusts were measured at over 65mph. Major
roadways such as Lake Shore Drive were shut down and
impassable. While there were no blizzard-related deaths
reported in DuPage County, every community in DuPage
County was significantly impacted. Response cost
countywide related to this event was estimated at over $3
million, resulting in State and Presidential Disaster
Declarations (IEMA, 2013) As a result of the Presidential
Declaration, Public Assistance re imbursements totaling
$3,041,412 were received by 133 entities throughout
DuPage County (FEMA, 2011).
Thousands of motorists and their vehicles became
stranded during the evening hours as conditions
deteriorated and snow quickly accumulated. The National
Guard was activated to assist stranded motorists traveling
on interstates but large sections of interstates, including
Interstate 80 and Interstate 39 were eventually closed.
Many communities began assisting stranded motorists
using plow trucks and many police officers began riding
with plow truck drivers to respond to emergency calls
because their cars were getting stuck in the snow. Many
communities also had plow trucks escort ambulances and
fire trucks. Other rescue personnel used snowmobiles to
respond to emergency calls (IEMA, 2013).
During the height of the storm from the evening of
February 1st into the morning of February 2nd, many
communities pulled their plow trucks off the roads out of
concern for the safety of their drivers. Many communities
declared roads closed to traffic with little hope of a rescue
for anyone who ventured out into the blizzard and needed
help. Whether roads were officially closed or not, most
were impassible.
The high winds also blew down tree limbs and power lines
causing numerous power outages. A portion of a garden
center roof collapsed under the weight of heavy snow in
Naperville. On Sunday February 13th, a 10-foot section of
brickwork on the parapet along the roof of a building
collapsed on Westmore Avenue in Lombard . Heavy snow
and ice slid into the parapet and knocked it down.
2-29 2018
Natural Hazard Mitigation Plan
Probability and Frequency: Since 1994 when the National Climate Data Center (NCDC)
started recording events, DuPage County has been impacted by one to three snow or ice
events each winter. Therefore, the odds of a severe winter storm hitting DuPage County
in any given year are 1:1 or a 100 percent chance.
Life Safety and Public Health: Severe winter storms bring the following two types of safety
hazards. The first, weather-related hazards, includes hazardous driving and walking
condit ions and heart attacks from shoveling snow. The second type, Extreme cold, is from
the low temperatures, wind chill, and loss of heat due to power outages.
In the United States, the number of deaths peaks in midwinter and reaches a low point in
late summer. Certain populations are especially vulnerable to the cold, including the
elderly, the homeless, and lower income families with heating problems. (Mayo Clinic,
2017). "Most deaths from [severe] winter storms are not directly related to the storm
itself:
• People die in traffic accidents on icy roads.
• People die of heart attacks while shoveling snow.
• People die of hypothermia from prolonged exposure to cold."
(NOAA, 2017f)
"Everyone is potentially at risk during [severe] winter storms. The actual threat to you
depends on your specific situation. Recent observations show that:
• Of injuries related to ice and snow:
• About 70% occur in automobiles.
• About 25% are people caught out in the storm.
• Majority are males over 40 years old.
• Of injuries related to exposure to cold:
• 50% are people over 60 years old.
• Over 75% are males.
• About 20% occur in the home."
(NOAA, 2017f)
"The effect of cold on people is usually made more severe by the impact of wind chill
factors. Wind chill is reported as a temperature, but is not the actual temperature. Rather
it is how wind and cold feel on exposed skin. As the wind increases, heat is carried away
from the body at an accelerated rate, driving down the body temperature. Extreme cold
can result in people and animals suffering from frostbite and hypothermia. Frostbite is
damage to tissue caused by the effects of ice crystals in frozen tissue. Extremities
(hands, feet, ears, and nose) with more circulation difficulties are most frequently
affected" (Mayo Clinic, 2017).
"Hypothermia is the lowering of the core body temperature. It is "clinically significant"
when the body temperature is below 95 ° F. Severe hypothermia occurs when the body's
temperature drops below 85 ° F, resulting in unconsciousness. If help does not come,
death follows. Great care is needed to properly re-warm a person, even mild cases" (Mayo
Clin ic 2017).
Property Damage and Critical Facilities: Historically, roofs would collapse due to heavy
snow loads, but most buildings are now constructed with low temperatures, snow loads
Hazard Analysis 2-30 2018
Natural Hazard Mitigation Plan
and ice storms in mind. With today's energy consciousness, buildings are much better
insu lated than they were 50 years ago. Severe winter storms do not have a major impact
on buildings. The major impacts of snow and ice storms on property are to utilities and
roads. Power lines and tree limbs are coated with heavy ice result ing in disrupted power
and telephone service, often for days. Even small accumulations of ice can be extremely
dangerous to motorists and pedestrians. Bridges and over passes are particularly
dangerous because they freeze before other surfaces.
Loss of power means businesses and manufacturing corporations must consider closure.
Loss of access due to snow or ice-covered roads has a similar effect. There are also
impacts when people cann9t get to work, to school, or to the store. Proper planning is
critical in winter weather situations.
2.4 Tornadoes
A tornado is a violently rotating column of air exte nd ing from a thundersto rm to the
ground. Since wind is invisible, tornados are hard to see unless one forms from water
droplets, dust, and /or debris. The most violent tornadoes are capable of tremendous
destruction with wind speeds of 250 mph or more. Damage paths can be more than one
mile wide and 50 miles long. Most tornadoes, have wind speeds of 112 mph or less.
"Dr. T. Theodore Fujita first introduced The Fujita Scale in th e SMRP Research Paper,
Number 91, published in February 1971 and titled, "Proposed Characterization of
Tornadoes and Hurricanes by Area and Intensity". Fujita revealed in the abstract his
dreams and intentions of the F-Scale. He wanted something that categorized each
tornado by intensity and area. The scale was
divided into six categories which can be seen Table 2-13
below and in Table 2-13 (NOAA and NWS, EF Scale
2017):" Derived Ef Scale Recommended EF Scale
• FO (Gale)
• Fi (Weak)
EF 3.Second Gust 3.Second Gust
Classes Speed mph Speed, mph
EFO 65-85 65 ·85
• F2 (Strong)
• F3 (Severe)
EF1 86-109 86 • 110
EF2 110-137 111-135
EF3 138-167 136-165
• F4 (Devastating) EF4 168-199 166. 200
• F5 (Incredible) EF5 200-234 >200
"Dr. Fujita's goals in his research in developing the F-Scale were:
• Categorize each tornado by its intensity and its area
• Estimate a wind speed associated with the damage caused by the tornado
Dr. Fujita and his staff showed the value of the scale's application by surveying every
tornado from the Super Outbreak of April 3-4, 197 4. The F-Scale then became the
mainstay to define every tornado that has occurred in the United States. The F-Scale also
became the heart of the tornado database that contains a record of every tornado in the
United States since 1950" (NOAA and NWS, 2017). "Tornadoes occ ur i n many parts of
the world, including Australia, Europe, Africa, Asia, and South America. Even New Zealand
reports about 20 tornadoes each year. Two of the highest concentrations of tornadoes
outside the U.S. are Argentina and Bangladesh" (NOAA and NWS, 2017).
Hazard Analysis 2-31 2018
Natural Hazarcl Mitigation Plan
"About 1,200 tornadoes hit the U.S. yearly. Since official tornado records only date back
to 1950, we do not know the actual average number of tornadoes that occur each year.
Plus, tornado spotting and reporting methods have changed a lot over the last several
decades" (NOAA and NWS, 2017). Tornadoes come in all shapes and sizes and can occur
anywhere in the U.S. at any time of the year. In the southern states, peak tornado season
is March through May, while peak months in the northern states are during the summer
months.
Past Events: Table 2-14 shows the recorded tornado events for DuPage County from
1950 to 2011, as recorded by NOAA's National Climate Data Center (NOAA, 2017h).
From 1950 to 2011, DuPage County has had one F3 tornado and one F4 tornado during
th e same month, June 1976. There have been seven F2 events. There were no deaths
attributed to the tornadoes shown in Table 2-14, however there were several i njuries.
Table 2-14
Tornadic Activity in DuPage County, Illinois (1950-2017)
Tote ls:
oU""PA"GEC"o.·
ou-t=>/iGE{<)"
OU PAGE CO,
bu PAGEco.
o-W5AGECo-
6u-Pi\(frco.
ou-e.A.Ge-C;o
DU PAGEC6:
DUPAGE-co· -
ou eAGf co.
i:iUPAGEco--:-
OiJ eilGE CO.
6UPAG°E"CO ou f>Af;'ECCI.
6U "i5..\GE-fo-:-
o-u'PilGEc·o. ----
2007: On August 23rd, 2007, an EF1 tornado touched down near Prince Crossing Road
south of Geneva Road in Winfield. The tornado had a path len gth of 2.67 miles and a
path width of 300 to 500 yards. The tornado lifted just west of Gary Avenue south of
Geneva Road. The main damage from the tornado included several large uprooted
hardwood trees. Shingles and power lines were also blown down.
2008: On August 4th, 2008, a brief EF1 tornado touched down in an industrial area near
Fox Court. It continued east northeast across South Gary Drive and dissipated near
Hazard Analysis 2-32 2018
Natural Hazard Mitigation Plan
Stratford Square Mall. A large warehouse had a wall blown out near Fox Court and
Madsen Drive (NOAA, 2008).
A second, brief tornado touched down in Bloomingdale near an apartment complex on
Century Point Lane (NOAA, 2008). There was roof and window damage at two apartment
buildings. Significant damage was done to roofs of houses and to trees from Cardinal
Drive east across Bloomingdale Road through Norton Lane and into the area around
Sterling Drive (NOAA, 2008).
2011: On June 21st, 2011, the National Weather Service storm survey confirmed an EF1
tornado touched down near Sunnydale Park and lifted near 55th and Main in Downers
Grove. Most of the damage was to trees. Many mature hardwood trees had been
snapped or knocked down. An estimated 35 homes were damaged by falling trees.
Probability and Frequency: For
DuPage County, most
tornadoes appear to occur
March through September
(Exhibit 2-21) (NWS, 2017). In
the 2013 Illinois Natural
Hazard Mitigation Plan (IEMA,
2013), DuPage County had 24
of the 2,199 tornadoes
recorded in Illinois between
1950 and 2012. This ranks
DuPage County 8th in the State
for the highest normalized
number of tornadoes per 100
square miles. DuPage County is
classified as having an
"elevated" tornado risk based
on historic tornado wind
speeds and the number of
recorded tornadoes per 1,000
square miles.
Exhibit 2 -21
Tornadoes by Month in Northern Illinois and Northwest
Indiana
Tornadoes by Month
ISO
16&
110
l lO
100
so
60 II
10
lO ~~[]
J AN f"EB ~IAK APK ~LI\"
""• ~1 ,e _,,. 19'• ?O!i.
I
I
'
Jl•N Jl'L AUG SEP oc r NO\" DEC
??% 4'• 1 M~ $~• l ~• .n a •~•
Though there are no official recurrence intervals calculated for tornadoes, with 20
occurrences over 57 years (1950 to 2007), the likelihood of a tornado hitting somewhere
in the county is 35% in any given year. The width and the length of a tornado's path can
vary greatly, but with an assumption that a tornado affects one square m ile of land, and
there are 334 square miles in DuPage County, the odds of a tornado hitting any particular
square mile in the County is 1 in 960 each year, or a 0.001% chance (NOAA, 2017h).
While at times DuPage County has experienced lulls in tornadic activity of nearly 10
years, when examining the intervals between tornadoes, outlined in Table 2-13, DuPage
County experiences a tornado approximately every 2 years. The paths of tornadoes from
1950 to 2012 can be seen in Exhibit 2-22.
Hazard Analysis 2-33 2018
I .
Natural Hazard Mitigation Plan
Exhibit 2-22
DuPage County Recorded Tornado Occurrences (1950-2012)
RECORDED TORNADO OCCURRENCES (1950·2012)
DU PAGf COUNlY, llllNOIS
.i
' •I
·'
Life Safety and Public Health: Although no deaths have been attributed to a tornado in
DuPage County, the r isk of loss of life is still great. The August 1990 twister in Plainfield,
Hazard Analysis 2-34 2018
Natural Hazard Mitigation Plan
Illinois caused 28 deaths. The Utica, Illinois tornado of 2004 killed eight people in one
location (NOAA, 2017h).
The major health hazard from tornadoes is physical injury from flying debris or being in a
collapsed building or mobile home. Based on national statistics for 2007 -2016, there
were 1,051 people killed, and 7,438 people injured by tornados. The August 1990
tornado in Plainfield, Illinois injured 350 people (NOAA, 2017h).
Within a building, flying debris or projectiles are generally stopped by interior walls.
However, if a building has no partitions, any glass, brick or other debris blown into the
interior is life threatening. Following a tornado, damaged buildings are a potential health
hazard due to instability, electrical system damage, and gas leaks. Sewage and water
lines may also be damaged.
DuPage County has lost a life to a tornado and had injuries. Residents living in mobile
homes are more vulnerable than people in permanent homes. People can inadvertently
put their lives in danger during a tornado, or have little or no warning.
Property Damage and Critical Facilities: Although tornadoes strike at random, making all
buildings vulnerable, three types of structures are more likely to suffer damage:
• Mobile homes,
• Homes on crawlspaces (more susceptible to lift), and
• Buildings with large spans, such as airplane hangars, gymnasiums and factories.
In areas subject to extreme wind events, those responsible for public safety-including
building owners, schools, hospitals, and neighborhood associations-should consider
building accessible community safe rooms. People who live or work in structures with
inadequate protection, such as mobile homes or buildings with long-span roofs, also
should discuss the option of building a community safe room or shelter. (FEMA, 2014)
In 1999, FEMA conducted an extensive damage survey (FEMA, 2009) of residential and
non-residential buildings in Oklahoma and Kansas following an outbreak of tornadoes on
May 3, 1999, which killed 49 people. The assessment found:
• The failure for many residential structures occurred where the framing wasn't
secured to the foundation, or when nails were used as the primary connectors
between the roof structure and the walls. A home in Kansas, for example, was
lifted from its foundation. The addition of nuts to the foundation anchor bolts
(connected to the wood framing) may have been all that was needed to prevent
this.
• Roof geometry also played a significant role in a building's performance.
• Failure of garage doors, commercial overhead doors, residential entry doors or
large windows caused a significant number of catastrophic building failures.
• Manufactured homes on permanent foundations were found to perform better
than those that were not on solid foundation walls.
If you divide the County's total number of housing units, 357,016 (American Fact Finder,
2016, P. 1), by the County's total square miles, 334, the County's housing density is
approximately 1,069 homes per square mile. If a tornado impacts a 5-square mile area of
Hazard Analysis 2-35 2018
Natural Hazard Mitigation Plan
the County, approximately 5,000 to 5,500 homes would be affected (DuPage County area
equals 334 square miles). If 50% percent of the homes in that area were subject to
damage, based on the average home price in DuPage County (ArcGIS, 2017), then the
vulnerability of DuPage County buildings would approximately be:
(5 square miles x 1,069 housing units per square mile x $304,449 per home) x 50% =
= $16.27 million in property value exposed
Because a tornado can hit anywhere in the County, all of them are susceptible to being
hit. Schools are a particular concern, though for two reasons:
• They have large numbers of people present, either during school or as a storm
shelter, and
• They have large span areas, such as gyms and theaters.
The 1990 Plainfield tornado was an unfortunate example of this. It struck the Plainfield
High School, Grand Prairie Elementary School, St. Mary Immaculate Church and the
gymnasium to the Church's elementary school. Cost to repair the two public schools was
estimated at up to $35 million. The cost for the church and its school was $5 million.
Large span buildings were also affected in 1990. In addition to the schools and their
gyms, hangers at the Aurora airport and Joliet's Essington Road Fire Station were
damaged. At this time, it is unknown which critical facilities in DuPage County may have
large span structures.
2.5 Drought
A drought is a prolonged period in which an area or community has a shortage of water.
This often occurs during an absence of precipitation for an extended period of time. There
are four types of drought:
• Meteorological drought: "Meteorological drought happens when dry weather
patterns dominate an area (NOAA, N.D.c)".
• Hydrological drought: "Hydrological drought occurs when low water supply
becomes evident, especially in streams, reservoirs, and groundwater levels,
usually after many months of meteorological drought (NOAA, N.D.c)".
• Agricultural drought: "Agricultural drought happens when crops become affected
(NOAA, N.D.c)".
• Socioeconomic drought: "Socioeconomic drought relates the supply and demand
of various commodities to drought (NOAA, N.D.c)".
Probability and Frequency: "Meteorological drought can begin and end rapidly, while
hydrological drought takes much longer to develop and then recover. Many different
indices have been developed over the decades to measure drought in these various
sectors. The U.S. Drought Monitor depicts drought integrated across all time scales and
differentiates between agricultural and hydrological impacts (NOAA, N.D.c)". The National
Oceanic and Atmospheric Administration, uses the Palmer Drought Severity Index to
determine drought conditions. Exhibit 2-23 shows the steps of this index (NOAA, 2017i).
The 2013 Illinois Hazard Mitigation Plan (IEMA, 2013) estimated that historically,
moderate to severe drought occurs about 17% of the time in Illinois. However, southern
Hazard Analysis 2-36 2018
Natural Hazard Mitigation Plan
Illinois is generally more vulnerable to drought due to soils that hold less water and water
supplies that are more likely to rely on shallow groundwater and surface water (IEMA,
2013).
Exhibit 2-23
Palmer Drought Severity Index
e:dl eino ~r<i----rliOOfrftl(!-~Id-ffiOO~e fy very i$i.1 t~
dr~t dtO<\.l~:.I ~~i lilf"9 0 nxttl r~! ,.~, ----$.00 -.3 «I ·2,C<> -U» •i OO •lOO +·t.OO
41\1 co ~ lO to I<) lllld
~ -3,:M -:ti.99 .. t9? t2,9') +3~ nbo\"9
Past Events: "The nine months from March 1, 2005 to November 30, 2005, was the
driest Spring, Summer and Fall period ever recorded at Chicago O'Hare Airport and
Rockford Airport. During the nine month period, Chicago O'Hare measured 16.54 inches
of rain. Normal rainfall during that same nine month period is 30.46 inches. Rockford
Airport measured 17.83 inches for the nine month period. Normal rainfall during that
same nine month period is 31.82 inches (NOAA, N.D.d)" Drought conditions developed
within April 2005 across northern Illinois (NOAA, N.D .e). By June, the conditions had been
elevated to severe, water use restrictions and bans began to be put into effect, and
several counties began to declare agriculture disasters (NOAA, N.D.f). And, by July, the
drought level had been elevated to extreme, and "most farmers were estimating half or
more of their corn crops were lost (NOAA, N.D.f)", leading to an overall low in corn,
soybean, and hay yields for the year. In August, most of Illinois declared an agricu lture
disaster, and water restrictions and bans were put in place. Kane County experienced
wells running dry, and high algae within water retrieved from the Fox River (NOAA, N.D.g);
and some areas high numbers of fish died from increased temperatures and ecosystem
imba lances. Some communities reported having lower than optimal or required
emergency water supplies. Severe to extreme drought conditions continued across
northern Ill inois through February 2006 (NOAA, N.D .h). In 2012, DuPage County
experienced extremely dry conditions. Whi le other regions of the State experienced
drought conditions, some even extreme, DuPage Cou nty remained below a D4 (Illinois
State Climatologist, 2012).
Life Safety and Public Health: Droughts affect life safety and public health in several
ways. Health problems can arise from poor water quality, poor food qua lity, and increased
dust in the air. I n addition, droughts make the occurrence of fires more likely, spread
more quickly, and more difficu lt to put out. In add ition, poor air quality and a lack of water
may reduce residents engagement in recreationa l activities, reducing overall menta l and
physical well-being (University of Nebraska, National Drought Mitigation Center, N.D).
Property Damage and Critical Infrastructu re : Droughts significantly impact natura l
resources, and the animals that inhabit them. These effects include sometimes
destroying natura l habitats, increasing the likelihood of soil erosion, affecting wildlife
migration patterns, and reducing the hea lth of an imals (University of Nebraska, Nationa l
Drought Mitigation Center, N.D). In addition, the National Drought Miti gation Center, has
identified severa l infrastructure sectors that cou ld be directly, and somet imes even
severe ly impacted, by a drought:
• "Farmers may lose money if a drought destroys their crops.
Hazard Analysis 2-37 2018
Natural Hazard Mitigation Plan
• If a farmer's water supply is too low, the farmer may have to spend more money on
irrigation or to drill new wells.
• Ranchers may have to spend more money on feed and water for t heir animals.
• Businesses that depend on farming, like companies that make tractors and food ,
may l ose business when drought damages crops or livestock.
• Peop le who work in the timber industry may be affected when wi ldfires destroy
stands o f timber.
• Businesses that sell boats and fishing equipment may not be ab l e to sell some of
their goods because drought has dried up lakes and other water sources.
• Power compan ies that norma ll y rely on hydroe lectric power (electricity tha t 's
crea t ed from the energy of running water) may have to spend more money on
othe r fue l sources if drough t d ri es u p too much of the water supp ly. The power
companies' customers would also have to pay more.
• Wa ter compan ies may have to spend money on new or additiona l water supplies.
• Barges and ships may have difficu lty naviga t ing streams, rivers, and cana ls
because of low water levels, which would also affect businesses that depend on
water transportation for receiving or sending goods and materia ls.
• People might have to pay more for food ."
(University of Nebraska, National Drought Mitigation Center, N.D).
2.6 E xt reme Heat
"The definition of extreme heat varies based on many different factors, such as location,
weather conditions (such as temperature, humidity, and cloud cover), and the time of
year (U .S. EPA and CDC, 2016, P. 3)". In genera l, extreme heat is defined as an instance
when the
climate is 10
degrees
hotter than
average,
usua lly above
90 degrees
Fahrenheit.
"The heat
index is a
measure of
how hot it
feels when
re l ative
humidity is
factored in
with the
actual air
temperature .
Relative
humidity is
the
Hazard Analysis
!
f
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41
i
41 cc
40
4S
so
SS
60
6S
70
7S
80
85
90
95
100
Exh i b it 2 -24
National Oceanic and Atmospheric Administration
Nationa l Weather Service Heat Index
Temperature (0 f)
80 82 84 86 88 90 92 94 ~ 98 100 102 104 10 6 108 110
ao 81 83 as 88 91 94 ., r
80 82 84 87 89 93 96 loo
81 83 SS 88 91 95 103
81 84 86 89 93
82 84 SS 91 95 100
• • t f Utt' I Oft It'' I Jll ttt ; •• ,ftt.•t tft I t t (1 •tl"l~1 1 o
82 85 89 93 98 103
......................... , ••••• lo ••• , •••• ,. ~·., t
83 86 90 9S 100
84 88 92
SA 89 94
85 90 96
86 91 98
86 93 100
87 95 103
Likelihood of heat disorders with prolonged e>Cposure or strenuous activity
C.11utlon btrtnlCt uutlon Oangor -Extreme clangor
2 -38 2018
Natural Hazard Mitigation Plan
percentage of moisture in the air compared with the maximum amount of moisture the
air can hold. Humidity is an important factor in how hot it feels because when humidity is
high, water doesn't evaporate as easily, so it's harder for your body to cool off by sweating
(U.S. EPA and CDC, 2016, P. 3)". Exhibit 2-24 Shows the NOAA's Heat Index (U.S. EPA and
CDC, 2016, P. 3).
When an extreme heat event occurs, the National Weather Service may issue an
excessive heat warning, an excessive heat watch, a heat advisory, or a heat outlook. The
NWS defines these as the following:
• "Excessive Heat Warning-Take Action! An Excessive Heat Warning is issued within
12 hours of the onset of extremely dangerous heat conditions. The general rule of
thumb for this Warning is when the maximum heat index temperature is expected
to be 105 ° or higher for at least 2 days and night time air temperatures will not
drop below 75 °; however, these criteria vary across the country, especially for
areas not used to extreme heat conditions. If you don't take precautions
immediately when conditions are extreme, you may become seriously ill or die.
• Excessive Heat Watches-Be Prepared! Heat watches are issued when conditions
are favorable for an excessive heat event in the next 24 to 72 hours. A Watch is
used when the risk of a heat wave has increased but its occurrence and timing is
still uncertain.
• Heat Advisory-Take Action! A Heat Advisory is issued within 12 hours of the onset
of extremely dangerous heat conditions. The general rule of thumb for this
Advisory is when the maximum heat index temperature is expected to be 100° or
higher for at least 2 days, and night time air temperatures will not drop below 75 °;
however, these criteria vary across the country, especially for areas that are not
used to dangerous heat conditions. Take precautions to avoid heat illness. If you
don't take precautions, you may become seriously ill or even die.
• Excessive Heat Outlooks are issued when the potential exists for an excessive
heat event in the next 3-7 days. An Outlook provides information to those who
need considerable lead-time to prepare for the event."
• (NOAA, N.D.j)
Probability and Frequency: On average, the U.S. has been experiencing warming
summers throughout the past decade. This warming is correlated to recent changes in
climate. "Without big steps to reduce greenhouse gas emissions, the average number of
extremely hot days in the United States is projected to more than triple from the year
2050 to 2100 (U.S. EPA and CDC, 2016, P. 6)." Exhibit 2-25 Explains why the occurrence
of extreme heat events is become more frequent (U.S. EPA and CDC, 2016, P. 4).
Hazard Analysis 2-39 2018
Natural Hazard Mitigation Plan
Ex h ib it 2-25
U.S . Env i ronme nta l Protectio n Agency (EPA) and the Centers for Disease Contro l and
Prevention (CDC) Cli mate Change and Ex t reme Heat
T he chances are incfeasing that an extreme heat event could hap pen who:re )'O U hve. That's beca\.IS: avera(le temperatu!eS
are rhlng. botti m the Uni\ed States and around the wodd:
• Globally, the annual av;yage temp~ature fias ~= rising sinW? t h e beginni ng of th e 2 0'~ century, and temperatures ,are
e:.i:iected to continua to rise t h roug h the end o f lhis century,
• Worldwide, JS o t Lh e !G warmest years o n record ha'le occwred si nce :1000. with ihe el<\:li:Ption or 1998.'
Tomporatures Worldwldo, 1901 -2015
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Hazard Analysis 2-40
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2018
Natural Hazard Mitigation Plan
Past Events: "Northern Illinois experienced an intense heat wave during the first week of
July, 2012. High temperatures at Chicago O'Hare Airport reached 102 on the 4th, 103 on
the 5th and 6th and 98 on the 7th. Low temperatures remained in the upper 70s to lower
80s during much of the heat wave with a low temperature of just 82 degrees on the
morning of the 6th. Maximum heat index values were mostly in the range of 105 to 115
each day across northeast Illinois. A cold front moved across the area during the late
morning and early afternoon of July 7th, bringing several days of near normal
temperatures for mid-July (NOAA, N.D.i)".
The National Oceanic and Atmospheric Administration notes no extreme heat events
have occurred within DuPage County since 2012.
Life Safety and Public Health:
According to The Weather
Channel, extreme heat can affect
the human body in several ways
(The Weather Channel, 2016).
"Some of the first signs that your
body is beginning to have trouble
due to extremely hot
temperatures are increased
sweating and muscle
era mps. When you sweat, you
are losing water, and if you do
not replace the amount you are
losing, an imbalance in salt can
result, causing cramps" (The
Weather Channel, 2016). The
most common symptoms of heat
exposure are due to what is
called "heat exhaustion", these
are: dizziness, confusion,
fainting, nausea, diarrhea,
headaches, rapid or weak pulse,
and dehydration (The Weather
Exhibit 2-26
Expected Deaths from Increased Extreme Heat Events
2000 Baseline Combined
mortality rate
(d.aths/100kl
GI 0-2
0 l-4
0 5-8
0 9 -10
() 11-14
CJ 15 -18
Channel, 2016). "Another issue that can occur is heat edema, which is when your body
dilates your blood vessels in order to avoid overheating, and blood can pool in the legs,
especially if the balance of salt in your body is off" (The Weather Channel, 2016).
On a more serious note, prolonged exposure to extreme heat can cause a "heat stroke
and even death" (The Weather Channel, 2016). "Symptoms of a heat stroke include:"
• Body temperature above 103 degrees
• No sweating
• Severe headache
• Confusion or disorientation
• Red, hot and dry skin
• Nausea or vomiting
• Rapid pulse
Hazard Analysis 2-41 2018
• Seizures
• Loss of consciousness
• Muscle weakness or cramps"
(The Weather Channel, 2016)
Natural Hazard Mitigation Plan
As extreme heat events become more common, and more severe, the U.S. EPA and the
CDC estimate that deaths due to extreme heat events will increase. Exhibit 2-26 outlines
the expected outcomes from increased events (U.S. EPA and CDC, 2016, P. 8). The U.S.
EPA and CDC have also determined that those who live in primarily urban areas, like
DuPage County are also more at risk for experiencing adverse side effects of extreme
heat events. "Less vegetation means less shade and moisture to keep urban areas cool.
Conventional roofs and pavement reflect less and absorb more of the sun's energy, which
leads to higher temperatures near these structures. Additionally, tall buildings and narrow
streets can reduce air flow, further trapping the heat that gets absorbed during the day,
as well as heat generated by vehicles, factories, and air conditioning vents. All these
factors contribute to urban heat islands, which can worsen the impacts of climate
change, particularly as more extreme heat events occur. Compared with surrounding rural
areas, urban heat islands have higher daytime maximum temperatures and less
nighttime cooling. Temperatures in urban areas can be 1.8-5.4 ° F warmer than their
surroundings during the day. In the evening, this difference can be as high as 22° F
because the built environment retains heat absorbed during the day (U.S. EPA and CDC,
2016, P. 14)."
Property Damage and Critical Infrastructure: Heat has little or no impact on structures.
The demand on electric utilities will be elevated, given higher use of cooling systems.
2. 7 Earthquakes
"An earthquake is what happens when two blocks
of the earth suddenly slip past one another. The
surface where they slip is called the fault or fault
plane. The location below the earth's surface
where the earthquake starts is called
the hypocenter, and the location directly above it
on the surface of the earth is called
the epicenter" (USGS, 2017a). Exhibit 2-27 shows
how this phenomenon occurs (USGS, 2017 a).
Sometimes an earthquake has foreshocks. These
are smaller earthquakes that happen in the same
Exhibit 2-27
place as the larger earthquake that follows. Scientists can't tell that an earthquake is a
foreshock until the larger earthquake happens. The largest, main earthquake is called
themainshock. Mainshocks always have aftershocks that follow. These are smaller
earthquakes that occur afterwards in the same place as the mainshock. Depending on
the size of the mainshock, aftershocks can continue for weeks, months, and even years
after the mainshock!" (USGS, 2017a). "The earth has four major layers: the inner core,
outer core, mantle and crust. (figure 2) The crust and the top of the mantle make up a
thin skin on the surface of our planet. But this skin is not all in one piece -it is made up
Hazard Analysis 2-42 2018
Exhibit 2-29
28 outlines these layers (USGS, 2017a).
Natural Hazard Mitigation Plan
of many pieces like a puzzle covering the
surface of the earth. Not only that, but
these puzzle pieces keep slowly moving
around, sliding past one another and
bumping into each other. We call these
puzzle pieces tectonic plates, and the
edges of the plates are called the plate
boundaries. The plate boundaries are
made up of many faults, and most of the
earthquakes around the world occur on
these faults. Since the edges of the plates
are rough, they get stuck while the rest of
the plate keeps moving. Finally, when the
plate has moved far enough, the edges
unstick on one of the faults and there is
an earthquake" (USGS, 2017a). Exhibit 2-
Earthquakes are one of nature's most damaging hazards. Earthquakes, and the potential
damage from earthquakes, are more widespread than people realize. Earthquakes are
caused by the release of strain between or within the Earth's tectonic plates. The severity
of an earthquake depends on the amount of strain or energy that is released along a fault
or at the epicenter of an earthquake. The energy released by an earthquake is sent to the
earth's surface and released (USGS, 2017a).
USGS maps and other earthquake resources were examined to determine DuPage
County's exposure to earthquakes. A major earthquake near the New Madrid Fault or
other fault areas in the Midwest will be felt in Chicago. However, it was concluded that
DuPage County is not vulnerable to serious earthquake damage. Earthquakes are
discussed here in the event that DuPage County opted in the future to put more
emphasis on the potential earthquake hazard.
Earthquake Measurements: "There are several common measures of earthquakes,
including the Richter Scale and the Modified Mercalli Intensity (MMI) scale. The Richter
Scale is a measurement of the magnitude, or the amount of energy released by an
earthquake. Magnitude is measured by seismographs. The Modified Mercalli Intensity is
an observed measurement of the earthquake's intensity felt at the earth's surface. The
MMI varies, depending on the observer's location to the earthquake's epicenter (USGS,
2017b)". Exhibit 2-29 outlines potential damages from earthquakes (USGS, 2017b).
An earthquake's intensity depends on the geologic makeup of the area and the stability
of underlying soils. The effects of earthquakes can be localized near its epicenter or felt
significant distances away. For example, a 6.8-magnitude earthquake in the New Madrid
Fault in Missouri would have a much wider impact than a comparable event on the
California Coast. The thick sandstone and limestone strata of the central United States
behave as "conductors" of the earthquake's energy, and tremors can be felt hundreds of
miles away. By contrast, the geology of the West Coast allows the energy to be dissipated
relatively quickly which keeps the effects of the earthquake more localized (USGS,
2017b).
Hazard Analysis 2-43 2018
Natural Hazarcl Mitigation Plan
Exhibit 2-29
Forecast for Damage from Natural and Induced Earthquakes in 2017
USGS Forecast for Damage lrom Natural and Induced Earthquakes In 2017
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Earthquakes can trigger other types of ground failures which could contribute to the
damage. These include landslides, dam failures, and liquefaction. In the last situation,
shaking can mix groundwater and soil, liquefying and weakening the ground that
supports buildings and severing utility lines. This is a special problem in floodplains where
the water table is relatively high and the soils are more susceptible to liquefaction (USGS,
2017b). Exhibit 2-30 outlines forecasted ground shaking from potential earthquakes
(USGS, 2017b).
Past Events: In the United States, the most frequent reports of earthquakes come from
the West Coast, but the largest earthquakes felt in the U.S. occurred in Missouri in 1811
and 1812 along the New Madrid Fault (IEMA, 2013). The Great New Madrid Earthquakes
are the benchmarks from which all earthquakes in the Midwest are measured. An
important fact is that the earthquakes of 1811 and 1812 were not single events. Rather
the earthquakes were a series of over 2,000 shocks in five months.
Five of these quakes were larger than a magnitude of 8.0 on the Richter Scale, which
completely destroyed the town of New Madrid. The earthquakes caused the land to roll in
visible waves that raised and sank land as much as 20 feet. The tremors of these
earthquakes were no doubt felt throughout all of Illinois, since the quakes are said to
have rung church bells in New England (IEMA, 2013).
Probability and Frequency: At risk in DuPage County, given the low threat of an
earthquake at a Mercalli Intensity of VII or greater, are unreinforced masonry structures.
Most of these structures are considered to be historic masonry buildings located in
downtown areas. An estimate of damage is two percent of the value of non-residential
structures in the County. The impact of an earthquake would be on the local economy if
any damage was sustained to businesses and infrastructure. Public expenditures for
repairs to public facilities and clean-up and disposal of debris can be high, especially if
the structures are not insured for earthquakes.
Hazard Analysis 2-44 2018
Natural Hazard Mitigation Plan
Exhibit 2-29
USGS Forecast for Ground Shaking Intensity from Natural/ Induced Earthquakes -2017
...... ___ ,_ ...
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Life Safety and Public Health: While injury and loss of life are important factors in other
parts of Illinois when assessing earthquakes, they are of low concern for DuPage County.
During an earthquake, injuries are expected to be few. However, should a major
earthquake impact southern Illinois, there exists the potential for damage to natural gas
pipelines. This would be of greatest concern in the winter in northeastern Illinois.
Property Damage and Critical Infrastructure: Generally, wood frame buildings and
structures on solid ground fare best during an earthquake. Wood frame build ings are
fl exible enough to withstand ground shaking and swaying. Evaluations of recent
earthquakes found that damage was primarily caused to:
• Unreinforced masonry structures.
• Older buildings with some degree of deterioration.
• Bu ildings without foundation ties.
• Multi-story structures with open or "soft" first floors.
Most building codes have standards related to the first three concerns. This means that
the most threatened buildings are older ones (built before current cod es), masonry ones,
and taller ones with open first floors.
In addition to the building type, damage is related to the underlying soils. Buildings on
solid ground fare better, while those on loose or sandy soils w ill suffer more from shaking.
Hazard Analysis 2-45 2018
Natural Hazard Mitigation Plan
These can be found in floodplains. If there is enough water present, the shaking can
liquefy the underlying soils, which removes the support under the foundation.
2.8 Ground Failure
The term ground failure refers to a disturbance within the ground, usually caused by
shaking from an earthquake or a man-made cause, which creates an instability.
Examples of ground failure include landslides, liquification, erosion, and sinkholes. "A
landslide is the force of rocks, soil and debris moving down a slope and debris flows
(mudflows) are rock, earth and other debris saturated with water which changes into a
flowing river of mud (IEMA, 2013, P. 111-155)". Liquefaction is "a process by which water-
saturated sediment temporarily loses strength and acts as a fluid" (USGS, N.D.a).
"Erosion, removal of surface material from Earth's crust, primarily soil and rock debris,
and the transportation of the eroded materials by natural agencies (such as water or
wind) from the point of removal (Encyclopedia Brittanica, 2018)." Exhibit 2-30 shows the
various ways in which erosion can occur (Encyclopedia Brittanica, 2018).
Exhibit 2-30
Types of Erosion
"A sinkhole is a depression in the ground that has no natural
external surface drainage. Basically this means that when it
rains, all of the water stays inside the sinkhole and typically
drains into the subsurface (USGS., N.D.b)." "The term "karst"
refers to a landscape that typically is pockmarked
with sinkholes, may be underlain by caves, and has many large
springs that discharge into stream valleys. Karst landscapes
form when water from rain and snow melt seeps through a
relatively thin soil cover and into a fractured and
soluble bedrock (limestone or dolostone) (ISGS, N.D.}." Exhibit
2-31 depicts where karst landscapes exist within Illinois (ISGS,
N.D.). Exhibit 2-32 explains this process (ISGS, N.O.).
Hazard Analysis 2-46
Exhibit 2-31
Karst Landscape in Illinois
2018
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Exhibit 2-32
How A Sinkhole Forms
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Natural Ha zard Mitigation Plan
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Past Events: "Illinois does not have a state-wide reporting system for landslides (IEMA,
2013, P. 111-155)." Therefore, the DuPage County was unable to find any historical records
of landslides within the County; the same is true for the occurrence of sinkholes within
the County. In addition, no data has been found regarding liquification. While never
extreme, DuPage County's streambanks have experienced erosion in the past; an
example includes St. Joseph's Creek Watershed.
Probability and Frequency: While the State of Illinois does not record erosion as a risk for
DuPage County, and this is the case fo r many types of erosion (e.g. coastal erosion),
DuPage County is and will continue to be at risk for low to moderate erosion. In addition,
as previously described, the soil composites that are largely responsible for sinkholes
within the Midwest are not found within DuPage County. Therefore, a naturally occurring
s inkhole is unlikely. However, sinkhol es can form as a resu lt of a pipe leak over an
extended pe riod of t ime . This is scenario has a low to moderate risk of occurring within
the County. Finally, given DuPage County's high urban composition and relatively flat
topography, DuPage County is at a low to no risk of experiencing a landslide.
Life Safety and Public Health: Life safety risks, such as injuries, are possible if an
individual is involved in a ground failure. An example may include a veh icle collision if a
roadway is affected. In addition, if a ground failure involves water, the water may be
contam inated. Anyone who is exposed to contaminated water may be at risk for disease.
Property Damage and Critical Infrastructure: "Wh e n attempts to stabilize eroded stream
banks fail, they of ten result in adverse effects on neighboring properties as well. Before
any stream bank stabilization projec t is initiated, the prop erty owner should seek
professional gu idance on stabilization techniques, as well as information on floodplain
and wetland permits (DuPage County, N.D.d)." On a larger scale, ground failure can cause
damage to infrastructures, such as roadways, bridges, building foundations, dams, and
levees, wh ic h ca n l ea d t o d isr u ptio n of c ritical services and life safety t hreats.
Hazard Analysis 2-47 2018
Natural Hazard Mitigation Plan
2.9 Conclusions
1. DuPage County is a highly populated county, with 75.1 percent of the land developed,
and similar topography throughout. Total property value in the floodplain of DuPage
County, Illinois is estimated to be over $2.4 billion.
2. All communities and agencies involved in this Plan share the same vulnerability to
natural hazards.
3. The priority hazards identified by the Mitigation Workgroup are floods, severe summer
storms, severe winter storms, tornadoes, drought, and extreme heat.
4. Identification and analysis of natural hazards is consistent with the State of Illinois'
2013 Natural Hazard Mitigation Plan.
5. Floods have the highest impact on property impact in DuPage County based on
occurrence and floodplain location.
6. While injury and loss of life are important factors in other parts of Illinois when
assessing earthquakes, they are of low concern for DuPage County.
7. Tornadoes have a high potential impact on both property damage and loss of life.
8. Extreme heat is not just a nuisance; it kills hundreds of Am ericans every year and
causes many more to become seriously ill.
Hazard Analysis 2-48 2018
Natural Hazard Mitigation Plan
References
Overview
Federal Emergency Management Agency (FEMA). (August, 2013). Threat and Hazard
Identification and Risk Assessment Guide, Comprehensive Preparedness Guide (CPG)
201, Second Edition. Retrieved on: April 17, 2018. Retrieved from:
https://www.fema.gov/media-library-
data/8ca0a9e54dc8b037 a55b402b2a269e94/CPG201 htirag 2nd edition .pdf
Illinois Emergency Management Agency (IEMA), (2013). Illinois Natural Hazard Mitigation Plan.
Retrieved on: December 28, 2017. Retrieved from:
https://www.illinois.gov/iema/Mitigation/Documents/Plan lllM itigatio nPlan.pdf
2.1 References
Best Places. (N.D.) DuPage County, Illinois Climate. Retrieved on: December 7, 2017. Retrieved
from: http://www.bestp laces.net/climate/county/i llinois/dupage
Centers for Disease Control and Prevention (CDC). (N.D.). Water, Sanitation, & Hygiene (WASH)-
related Emergencies & Outbreaks. Retrieved on: December 28, 2017. Retrieved from:
https://www.cdc.gov/healthywater/emergency/extreme-weather/floods-
sta ndingwater.html
Chicago Metropolitan Agency for Planning (CMAP). (2017, July 7). Stormwater and Flooding On
To 2050 Strategy Paper. Retrieved on: December 28, 2017. Retrieved from:
http://www.cmap.illinois.gov/documents/10180/67 4 739/2017-07-06-ENR-5.0-
0N+ T0+2050+Stormwater+and+Flooding+Strategy+Paper+Presentation.pdf/e8b97ff1-
Ocfb-4cf d-8574-18566f0bbfd1
DuPage County, Illinois. (N.D.a). Floodplain Mapping. Retrieved on: December 7, 2017.
Retrieved from: https://www.dupageco.org/EDP/Stormwater Management/1160/
DuPage County, Illinois. (N.D.b). Model Education & Status. Retrieved: December 28, 2017.
Retrieved from: https://www.dupageco.org/EDP /Stormwater Management/1250/
DuPage County, Illinois. (N.D.c). Revised Preliminary DFIRM Map Compare. Retrieved on:
December 28, 2017. Retrieved from:
http://dupage.maps.arcgis.com/apps/webappviewer/index.html?id=011a48baf0c7451
9af0f28c93daa0548
DuPage County, Illinois. (2013). April 2013 FEMA Presentation. Retrieved on: January 18, 2018.
Federal Emergency Management Agency (FEMA). (N.D.a). Chapter 2 Types of Floods and
Floodplains. Retrieved on: December 27, 2017. Retrieved from:
https://training.fema.gov/hiedu/docs/fmc/chapter%202%20-
%20types%20of%20floods%20and%20floodp lains.pdf
Federal Emergency Management Agency (FEMA). (2001). Understanding Your Risks: Identifying
Hazards and Estimating Losses. Retrieved: December 28, 2017. Retrieved from:
https://www.fema.gov/media-library-data/20130726-1521-20490-4917 /howto2.pdf
Federal Emergency Management Agency (FEMA). (2017a, November 30). Definitions. Retrieved
on: December 28, 2017. Retrieved from: https://www.fema.gov/national-flood-insurance-
program/ de fin it ions
Illino is Department of Natural Resources (IDNR). (2015, June). Report for the Urban Flooding
Awareness Act. Retrieved on: December 28, 2017. Retrieved from:
https://www.dnr.illinois.gov/waterresources/documents/final ufaa report.pdf
Hazard Analysis 2-49 2018
Natural Hazard Mitigation Plan
National Oceanic and Atmospheric Administration (NOAA). (N.D.a) Watersheds, flooding &
pollution. Retrieved on: December 27, 2017. Retrieved from:
http://www.noaa.gov/resource-collections/watersheds-flooding-pollution
National Oceanic and Atmospheric Administration (NOAA). (N.D.b). Severe Weather 101.
Retrieved on: December 27, 2017. Retrieved from:
https://www. nssl. noaa .gov I ed ucation/ svrwx101/floods/
National Oceanic and Atmospheric Administration (NOAA}. (2006). NOAA Atlas 14 Point
Precipitation Frequency Estimates: IL. Retrieved on: December 28, 2017. Retrieved from:
https://hdsc.nws.noaa.gov/hdsc/pfds/pfds map cont.htm l?bkm rk=il
The Weather Channel. (20 15). In Flash Flooding, Your Vehicle Can Be Biggest Danger. Retrieved
on: December 28, 2017. Retrieved from: https://weather.com/safety/floods/news/flash-
flooding-vehicle-danger-20140717
World Health Organization (WHO). (N.D.) Flooding and communicable disease fact sheet.
Retrieved on: December 28, 2017. Retrieved from:
http://www. who. i nt/hac/techgu ida nee/ ems/flood eds/ en/
Yale Environment 360. (2016, August 29). Thousands of Homes Keep Flooding, Yet They Keep
Being Rebuilt Again. Retrieved on: December 29, 2017. Retrieved from:
http://e360.yale.edu/digest/thousands of us homes keep flooding and being rebuilt
fema i nsurance louisiana
2.2 References
ArcGIS. (2017). 2017 USA Median Home Values. Retrieved on: December 7, 2017. Retrieved
from:
https://www.arcgis.com/home/item .htm l?id=426 7 d9a2d7 d84a 7990 7 a46e93d28af01
American Fact Finder. (2016). Selected Housing Characteristics 2011-2015 American
Community Survey 5-Year Estimates. Retrieved on: December 15, 2017. Retrieved from:
https://www .census. gov I acs/www I data/ data-ta bl es-and-tools/ data-profi les/2016/
National Oceanic & Atmospheric Administration (NOAA}, (2017a). National Severe Storms
Laboratory, Thunderstorm. Retrieved on: December 27, 2017. Retrieved from:
https://www.nssl.noaa.gov/education/svrwx101/thunderstorms/
National Oceanic & Atmospheric Administration (NOAA}, (2017b). National Severe Storms
Laboratory, Lightning. Retrieved on: December 27, 2017. Retrieved from:
https://www.nss l.n o a a .gov I ed ucation/svrwx101/1 ightn ing/
National Oceanic & Atmospheric Administration (NOAA), (2017 c). National Severe Storms
Laboratory, Lightning. Retrieved on: December 27, 2017. Retrieved from:
https://www.nssl.noaa.gov/education/svrwx101/wind/types/
National Oceanic & Atmospheric Administration (NOAA), (2017d). National Severe Storms
Laboratory, Lightning. Retrieved on: December 27, 2017. Retrieved from:
https://www.nssl.noaa.gov/education/svrwx101/hail/
National Oceanic & Atmospheric Administration (NOAA}, (2017 e). National Center for
Environmental Information, Storm Events Database. Retrieved on: December 28, 2017.
Retrieved from:
https://www. ncd c. no a a. gov /stormevents/ ch oosedates. jsp?statefi ps= 17%2CI LU NO IS
I nsurance In stitute for Business & Home Safety. (2017). Reduce Damage From High Winds
During Thunderstorms. Retrieved on: December 28, 2017. Retrieved from:
https:// d isaste rsafety. org/th u nde rstorms/h igh-wi nd-da mage-h om es/
Hazard Analysis 2-50 2018
Natural Hazard Mitigation Plan
2.3 References
Federal Emergency Management Agency (FEMA}, (2011). Illinois Natural Hazard Mitigation Plan.
Retrieved on: December 28, 2017. Retrieved from: https://www.fema.gov/disasters/year
Illinois Emergency Management Agency {IEMA}, (2013). Illinois Natural Hazard Mitigation Plan.
Retrieved on: December 28, 2017. Retrieved from:
https://www.illinois.gov/ie ma/Mitigation/Documents/Plan I llMitigationPla n. pdf
National Oceanic & Atmospheric Administration (NOAA}. (2017f}. National Severe Storms
Laboratory, Winter Storms. Retrieved on: December 28, 2017. Retrieved from:
https://www.nssl.noaa.gov/education/svrwx101/winter/
Mayo Clinic, (2017). Hypothermia. Retrieved on: December 28, 201 7. Retrieved from:
https://www.mayoclinic.org/diseases-conditions/hypothermia/symptoms-causes/syc-
20352682
National Oceanic & Atmospheric Administration (NOAA}. (2017g}. Storm Events Database.
Retrieved: December 29, 2017. Retrieved from:
https://www.ncdc.noaa.gov/stormevents/listevents.jsp?eventType=%28Z%29+Blizzard&
eventType=%28Z%29+Extreme+Cold%2FWind+Chill&eventType=%28Z%29+Heayy+Sno
w&eventType=%28Z%29+Winter+Storm&beginDate mm=01&beg inDate dd=01&begin
Date yyyy=1950&endDate mm=12&endDate dd=25&endDate yyyy=2017 &county= DU
%2BPAGE%3A43&hai lfilter=O .OO&tornfilter=O&wi ndfilter=OOO&sort=DT &submitbutton=S
ea rch&statefips= 17%2CILLINOIS
2.4 References
ArcGIS. (2017). 2017 USA Median Home Values. Retrieved on: December 7, 2017. Retrieved
from:
https://www.arcgis.com/home/item. htm l?id=4267 d9a 2d 7 d84a 7990 7 a46e93d 28af01
Federal Emergency Management Agency (FEMA}, (2014). How to Prepare for a Tornado.
Retrieved on: December 29, 2017. Retrieved from: https://www.fema.gov/media-library-
data/1409003506195-
52740fd2983079a211d041f7aea6b85d/how to prepare tornado 033014 508.pdf
Federal Emergency Management Agency (FEMA}, (2009). Oklahoma Severe Storms and
Tornadoes (DR-1820). Retrieved on: December 29, 2017. Retrieved from:
https://www.fema.gov/disaster/1820
Illinois Emergency Management Agency (IEMA}, (2013). Natural Hazard Mitigation Plan.
Retrieved on: December 28, 2017. Retrieved from:
https://www.illinois.gov/iema/Mitigation/Documents/Plan l llMitigatio nPlan .pdf
Texas Tech University, (2006). Enhanced Fujita Scale, EF-Scale. Retrieved on: December 28,
2017. Retrieved from: http://www.depts.ttu.edu/nwi/Pubs/FScale/EFScale.pdf
National Oceanic & Atmospheric Administration (NOAA}, The National Weather Service (NWS},
(2008, August 15). August 4 1h, 2008 Tornadoes and Damaging Winds. Retrieved on:
January 10, 2018. Retrieved from: https://www.weather.gov/lot/2008aug04
National Oceanic & Atmospheric Administration {NOAA}, The National Weather Service (NWS},
(2017). Storm Prediction Center, The Enhanced Fujita Scale. Retrieved on: December 28,
2017. Retrieved from: http://www.spc.noaa.gov/efscale/
National Oceanic & Atmospheric Administration (NOAA}, (2017h}. National Center for
Environmental Information, Storm Events Database. Retrieved on: December 28, 2017.
Ret rieved from:
https: //www. n cd c. noaa. gov I stormevents/I isteven ts. jsp?eve nt Type=%28C%29 +Tornado&
Hazard Analysis 2-51 2018
Natural Hazard Mitigation Plan
beginDate mm=09&beginDate dd=01&beginDate yyyy=1997&endDate mm =12&endD
ate d d = 01&e n d Date yyyy= 201 7 &county= DU %2 B PAG E%3A43& ha i If i lte r=O. OO&to rnf i lte r
=O&w i ndfilter=OOO&sort= DT &su bm itbutton =Sea rch&statefi ps= 17%2CI LU NOIS
National Weather Serice (NWS). (2017). Tornados by Month, DuPage County, Illinois. Ret ri eved
on: December 28, 2017. Retr ieved from:
https://www.weather.gov/lot/tornadoclimatology
2.5 References
Illinois Emergency Management Agency (IEMA). (2013, October). 201311/inois Natural Hazard
Mitigation Plan. Retrieved on: December 2, 2017. Retrieved from:
https://www.ill inois.gov/iema/Mitigation/Documents/Plan l llMitigationPlan.pdf
Ill inois Stat e Climato logis t. (2012, Ju ly 26). Drought Intensifies in Illinois. Ret ri eved o n:
Dece m ber 29, 2017. Retrieved from:
https://climateillinois.wordpress.com/2012/07 /26/drought-intensifies-in-illinois/
National Oceanic and Atmospheric Administration (NOAA). (N.D.c). Definition of Drought.
Retrieved on: December 29, 2017. Retrieved from:
https://www.ncdc.noaa.gov/monitoring-references/dyk/drought-definition
National Oceanic and Atmospheric Administration (NOAA). (N.D.d}. Storm Events Database Event
Details. Retrieved on: December 29, 2017. Retrieved from:
https://www.ncdc.noaa .gov/stormevents/eventdetails.jsp?id=5480181
Nationa l Ocea ni c and Atmosphe ric Administrat ion (NOAA). (N.D.e}. Storm Events Database Event
Details. Retrieved on: December 29, 2017. Retrieved from:
https://www.ncdc.noaa.gov/stormevents/eventdetails.jsp?id=5457 418
National Oceanic and Atmospheric Administration (NOAA). (N.D.f). Storm Events Database Event
Details. Retrieved on: December 29, 2017. Retrieved from:
https://www.ncdc.noaa.gov/stormevents/eventdetails.jsp?id=5463069
National Oceanic and Atmospheric Administration (NOAA). (N.D.g}. Storm Events Database Event
Details. Retrieved on: December 29, 2017. Retrieved from:
https://www.ncdc.noaa .gov/st ormevents/eventdetails.jsp?id=54 75712
National Oceanic and Atmospheric Ad mi nistration (NOAA). (N.D.h). Storm Events Database Event
Details. Ret rieved on: December 29, 2017. Retrieved from:
https://www.ncdc.noaa.gov/stormevents/eventdetails.jsp?id=5492281
National Oceanic and Atmospheric Administration (NOAA). (2017i). Historical Palmer Drought
Indices. Retrieved on: December 29, 2017. Retrieved from:
https://www.ncdc.noaa.gov/temp-and-precip/drought/historical-palmers/
University of Nebraska, National Drought Mitigation Center. (N .D.). Types of Drought Impacts.
Retrieved on: December 29, 2019. Retrieved from:
http://drought.unl .edu/DroughtforKids/HowDoesDroughtAffectOurlives/TypesofDroughtl
m pacts.aspx
2 .6 Ref erences
National Oceanic and Atmospheric Administration (NOAA). (N.D.i). Storm Events Database.
Retrieved on: December 29, 2017. Retrieved from:
https://www.ncdc.noaa.gov/stormevents/eventdetails.jsp?id=404058
(National Oceanic and Atmospheric Administration (NOAA}. (N.D.j). Heat Watch v. Warning.
Retrieved on: December 29, 2017. Retrieved from:
http://www. nws.noaa .gov I om /heat/ww .shtm I
Hazard Analysis 2-52 2018
Natural Hazard Mitigation Plan
The Weather Channel. (2016, June 20). Four Things Extreme Heat Does To Your Body. Retrieved
on: December 29, 2017. Retrieved from: https://weather.com/health/news/four-things-
extreme-heat-does-to-your-body
U.S. Environmental Protection Agency (EPA) and the Centers for Disease Control and Prevention
(CDC). (2016, October). Climate Change and Extreme Heat What You Can Do to Prepare.
Retrieved on: December 29, 2017. Retrieved from:
https: //www.cdc.gov I cl i matea nd h ea Ith/pubs/ ext re me-heat-guidebook. pdf
2. 7 References
Illinois Emergency Management Agency (IEMA}, (2013). Illinois Natural Hazard Mitigation Plan.
Retrieved on: December 28, 2017. Retrieved from:
https://www .ill i no is.gov /ie ma/M itigation/Docu ments/Pla n I llMitigation Pia n.pdf
United States Geological Survey (USGS}, (2017a). The Science of Earthquakes. Retrieved on:
December 29, 2017. Retrieved from:
https://ea rthg ua ke.usgs.gov /learn/kids/ egscien ce. ph p
United States Geological Survey (USGS}, (2017b). New USGS Maps Identify Potential Ground-
Shaking Hazards in 2017. Retrieved on: December 29, 2017. Retrieved from:
https: //www. us gs. gov/news/ new-us gs-ma ps-ide ntif y-pote ntial-grou nd-sha king-hazards-
2017
2.8 References
Encyclopedia Brittanica. (2018}. Eros ion. Retrieved on: April 4, 2018. Retrieved from:
https://www.britannica.com/science/erosion-geology
Ill inois Emergency Management Agency (IEMA). (2013, October}. 201311/inois Natural Hazard
Mitigation Plan. Retrieved on: December 2, 2017. Retrieved from:
https://www .i II i nois.gov /iema/M itigation/Docu ments/Pla n I llM iti gationPla n. pdf
Illinois State Geological Survey (ISGS). (N.D.) Karst Lan dscapes of Ill inois: D isso lving Bedrock
and Collapsing Soil. Retrieved on: April 18, 2018. Retrieved from:
http://www. is gs. i 11 i nois.ed u/ outreach/geology-resou rces/ka rst-la nd sca pes-il Ii nois-
disso lvin g-bed rock-and-co I lapsing-so ii
United States Geological Survey (USGS). (N.D.a). Earthquake Glossary, Liquefaction. Retrieved
on: April 18, 2018. Retrieved from:
https:// ea rthg uake.usgs.gov /lea rn/glossa ry/?term =I ig uefaction
Un ited States Geological Survey (USGS). (N.D.b). What is a sinkhole? Retrieved on: April 18,
2018. Retrieved from: https://www.usgs.gov/fags/what-are-sinkholes?qt-
news science products=O#gt-news science products
Hazard Analysis 2-53 2018
Natural Hazard Mitigation Plan
Chapter 3 -Goals
The goals and guidelines for this Plan were developed during the Workgroup's December 7
meeting and January 4 meetings. The goals reflect current priorities within each community,
as identified by municipal and County representatives , and community priorities identifi ed by
the public. In addition, the goals align with the CRS's six ha zard mitigation areas
(preventative measures, property protection, natural resource protection, emergency
services, structura l flood control projects, and public information) and with the emergency
management/first responder sector's priorities of: life safety, incident stabilization, property
protection, and environmental conservation. For further information on the activities
conducted during these meetings see section 1.3, Planning Process, within Chapter 1.
3.1 Community Priorities
During the December 7 meeting, the workgroup was asked to discuss and prioritize the
potential impacts of natural hazards. The following topics were identified by the Workgroup
to be of priority. It is important to note that topics not mentioned below are still of
importance and have been included to reflect this.
• Life Sat ety
• Public Health
• Critical Infrastructure Maintenance and Protection
• Climate Change
• Public Outreach, Education, and Awareness
• Public Information and Warning
• Inter-gov ernmenta l Coordination
• Public-Private Partnerships
• Repetitive Loss Properties
3.2 Plan Direction
The Workgroup conducted an additional exercise to develop guidelines for completing the
Plan's goals during the January 4 Workgroup meeting. The Workgroup discussed mitigation
strategies, compared these strategies to the goals, and prioritized them. For more
information on this activity, see section 1.3, Planning Process, within Chapter 1.
Mitigation activities discussed by the Workgroup on January 4, 2018:
• Preventative: Encouraging the adoption of current building codes.
• Property Protection: Requiring deeper foundations/ basements especially in
floodplain areas to prevent erosion, Enforcement of sub-surface dam improvem ents,
and increase overhead sewer rebates.
Goals 3-1 2018
Natural Hazard Mitigation Plan
• Natural Resource Protection: Streambank stabilization, better protection of wells,
enhance water quality by minimizing lead and copper levels, and urban forestry
programs (i.e. Tree City USA).
• Emergency Services: More collaboration with public sectors, to include more frequent
exercises (i.e. tabletops), safe rooms, Storm Ready® certification, emergency
generation, and enhanced communications.
• Structural Projects: Upgrade detention basins within floodplain areas and increase
downstream flood storage, and private damn stabilization repairs.
• Public Information: Siren messages, social media messages, utilization of websites
and newsletters.
3.3 Goals and Guidelines
The following goals (shown in order of importance) were developed by the Workgroup for the
purpose of guiding and directing the plan in accordance with governmental requirements,
community priorities, and changing circumstances. These goals were also compared with
other DuPage County and Chicago Metro Area County Plans to ensure aligning viewpoints
are used regionally. Given the importance of mitigating flooding within DuPage County, the
workgroup also ensured this Plan's goals are also consistent with Countywide Stormwater
and Flood Plain Ordinance, adopted by DuPage County and the municipalities, which
addresses stormwater, floodplain, wetland, and water quality management associated with
new and re-development.
Goal 1. Prioritize the health and safety of DuPage County residents from the impacts of
natural hazards.
Goal 2. Protect critical infrastructure within DuPage County by identifying and reducing
vulnerabilities to the impacts of natural hazards.
Goal 3. Strengthen relationships between the public sector, private sector entities, and
residents to enhance community resilience through a whole community approach.
Goal 4. Increase the preparedness and awareness of natural hazards among DuPage
County residents through targeted and coordinated outreach campaigns.
Goal 5. Promote better coordination between public service sectors, and encourage multi-
jurisdictional participation in sustainable and cost-effective mitigation projects.
Goal 6. Safeguard historic and cultural aspects of DuPage County from the effects of natural
hazards.
Goal 7. Encourage systematic updates and adoptions of regulations to ensure new
developments address changing environmental concerns and natural resource
protection.
Goals 3-2 2018
Natural Hazard Mitigation Plan
Goal 8. Protect properties and structures within DuPage County from the impacts of natural
hazards through the implementation of flood contro l projects, green infrastructure,
mitigation activities, and advanced warning systems.
The following guidelines were developed by the Workgroup for purpose of achieving the
goals and to fac ilitate the development of hazard mitigation action items in Chapter 9. These
guidelines are shown in order of importance:
Guideline 1. Prioritize hazards mitigation projects on the hazards that pose the greatest
threat on the community.
Guideline 2. Center public education strategies for the community around the need to take
steps to protect themselves, their families, and their property.
Guideline 3. Create and foster public-private partnerships to accomplish hazard mitigation
activities.
Guideline 4. Encourage interdepartmental and mult ijurisdictional collaboration and shared
resources when developing and conducting hazard mitigation exercises and
projects.
Guideline 5. Strive to improve and expand communication between public works and
emergency services before, during, and after a disaster response.
Guideline 6. Seek County, State, and Federal support for mitigation projects.
Goals 3-3 2018
Natural Hazard Mitigation Plan
Chapter 4 -Preventive Measures
Preventative activities keep problems related to natural hazards from escalating, and to
ensure new developments have reduced vulnerability to hazards. The following examples
of preventative measures are usually carried out by building, planning, zoning, and/or
code enforcement officials (FEMA, 2017a, P. 510-20):
• Floodplain mapping and data
• Open Space Preservation
• Floodplain Regulations
• Erosion Setbacks
• Planning and Zoning
• Stormwater Management
• Drainage System Maintenance
• Building Codes
The information within this Chapter largely focuses on building codes, planning and
zoning, stormwater runoff, floodplain management, water quality protection, and soil
erosion control into their operations. Activities such as river restoration and wetland
protection are resource protection activities aimed at preserving or restoring natural
areas. These activities enable the naturally beneficial functions of the land, such as
fields, floodplains or wetlands to be better realized. Further information on stormwater
activities can be found in Chapters 5, 6 and 7).
DuPage County is responsible for establishing Countywide minimum standards for
permitting of developments affecting stormwater runoff. In response to increasing flood
damages due to increasing urbanization in the Chicagoland area, the State authorized
the counties in northeastern Illinois to adopt countywide stormwater and flood plain
management programs. In addition to providing funding for regional watershed planning
and flood control efforts, the law allowed for the creation of countywide ordinances for
the prevention of future damages due to development. The County-wide Stormwater and
Flood Plain Ordinance (herein referred to as "ordinance") was adopted in October of
1991 and went into effect in February of 1992. The Ordinance addresses every aspect
of stormwater and floodplain management, including stormwater runoff and storage,
post-construction best management practices (BMPs), sediment and erosion control,
floodplain and floodway impacts, buffer area impacts, wetland impacts and water quality
impacts. The Ordinance also sets administrative requirements regarding permitting
procedures, performance security, enforcement and penalties, appeals and variance
procedures. Unincorporated DuPage County is a Non-Waiver Community under the
Ordinance, where Stormwater Management reviews and administers all areas of the
Ordinance within the Unincorporated area.
Preventative Measures 4-1 2018
Natural Hazard Mitigation Pl an
4.1 Building Codes
Updat ing and adopting n ew b ui lding codes, as we ll as address ing the effectiveness of
these codes, can be one of the best ways to conduct mitigat ion. When properly designed
and constructed, many buildings can withst and the impacts of high winds, a fl ood , or a
tornado. Many communities in Ill in ois are wo rking with various versions of t he
In t ernational Codes publis h ed by t he I nt ernationa l Code Counc il, Inc. (ICC). Th ese codes
include:
• Internationa l Buil d in g Cod e (IBC)
• Inte rn at io n al Res idential Code (IRC )
• Intern at io n al Fire Code (IFC)
• Intern at io n al Mechanica l Cod e (IMC)
• Inte rn ational Fu e l Gas Code (IFGC)
• Intern ation al Ex ist i ng Bu il ding Cod e (IEBC)
• Intern ation al Wi ldla nd -Urban Interface Code (IWU IC)
• Intern ation al Property Ma inte nance Code (IPM C)
• Inte rn ation al Swimmi n g Pool and Spa Code (ISPSC)
• Intern ation al Zo ning Cod e (IZC)
Add itiona ll y, Ill inois Co m m u n ities are req ui red by the St ate to e nfo rce the Illinois En ergy
Eff icient Bu i lding Code, Il linois State Pl umbing Code, and t h e I lli n ois Accessibi lity Code .
Th e following communities have updated t heir building codes within t he la st two years:
Darie n, Wi nfie l d, Warrenvi ll e, Downers Grove, Westmont, Lisle, Lombard, Bloomingdale,
Caro l Stream, Oa k Brook, Han over Park, Bensenvi lle .
In 2016, respo nd i ng t o t he Coun t y's efforts over t he past three yea rs to act iv el y
participate in t he Federa l Emergency Ma nageme nt Agency's (FEMA) NFIP Co mm un ity
Ra tin g Syste m (CRS ), t h e Co un t y Boa rd vetted and ado pted codes from th e 2015
Intern ationa l Cod e Counc il (IBC, IFC, IMC, IFGC, a nd I PMC), t he 2 014 National Electric
Code , th e 2 015 Il linois Ene rgy Efficient Build i n g Co de, a nd the c urrent Illi nois State
Pl umbin g Code . This effort in cluded, spec ific l an guage res po ns ive to th e FEMA
requ irem ents rega rd ing s u bsta ntia l dam age a nd loss req uirem ents, as well as elevation
ce rt ifi ca t es . Am e n dm ent s made re lative t o the Co unty's pa rtic ipa ti on in the CRS program
ar e as follows:
• The Count y of Du Page sought a nd gai n ed active partic i pa t ion in the CRS
p rogram so uninco rp orat ed res id ents w ill q u a lify fo r d isco unt ed fl oo d
i ns u ra n ce premi u ms.
• Pe r guida n ce from th e FEMA, t h e Co unty coordinated with and the Insu rance
Services Office, Inc. (ISO) and t he CRS program to ensure that credit ed
activi ties we re fu lly warranted.
• I n 2014 and 2015 , FEMA identifi ed areas of t he County 's programs th at can
be en h an ced to im p rove CRS ratings includ ing the deve lopm ent of programs
Preventative Measures 4-2 201 8
Natural Haza1d Mitigation Plan
relative to issuance of Elevation Certificates for properties that have
structures in Special Flood Hazard Areas.
• The Building Code text amendments passed by the County Board in 2016
have enabled the County to implement a program for the issuance of flood
elevation certificates which will enable practical improvements to properties
located within the floodplain and improve the County's CRS rating.
• The Building Code text amendments passed by the County Board in 2016
have enabled the County to keep pace with changes in the industry standards
providing more clarity in the enforcement of our codes and reduction in
redundancies in our codes.
Flood Standards: The I-Codes include definitions and standards that are FEMA
complaint. The 2015 IBC I-Codes recommends the separate adoption of Appendix G
Flood Resistant Construction at the time the IBC is adopted. Appendix G is intended to
fulfill the floodplain management and administrative requirements of the NFIP that are
not included in the IBC. DuPage County is currently working to follow through on this
recommended action.
Overhead sanitary sewers provide protection from sanitary sewer backups during periods
of heavy rains or flooding. The I-Codes and the Illinois State Plumbing Code do not
require the use of overhead sewers. The following communities require overhead sewers
be installed with new construction: Addison, Bartlett, Bloomingdale, Burr Ridge,
Clarendon Hills, Downers Grove, Hinsdale, Roselle, Villa Park, Wheaton, Willowbrook, and
Woodridge. Additional information on overhead sewers can be found in Chapter 5.
Code Administration: Enforcement of code standards is very important to hazard
mitigation. Adequate inspections are needed during the course of construction to ensure
that the builder understands and implements the requirements. The Building Code
Effectiveness Grading Schedule (BCEGS) is a national program used by the insurance
industry to determine how well new construction is protected from wind, earthquake and
other non-flood hazards. It is similar to the CRS program and the fire insurance rating
scheme: building permit programs are reviewed and scored, a class 1 community is the
best, and a class 10 community is the most basic rating. As a result of code
improvements and upgrades, many DuPage County communities have received
improved BCEGS ratings. Improvements noted within the 2016 and 2017 Natural
Hazard Mitigation Plan Annual Reports are listed below. Additional BCEGS information
for each community can be found within Table 4-1.
• In 2016, the County's (unincorporated) BCEGS rating was upgraded from a five
(5) to a four (4).
• In 2016, Lisle's BCEGS rating was upgraded from a five to a four.
• In 2016, Addison's BCEGs rating was upgraded from a five to a four. And, in 2017
Addison again was upgraded from a four to a three.
• In 2017, Downers Grove's BCESs rating was upgraded from a four to a three.
Preventative Measures 4-3 2018
Natural Hazard Mitigation Plan
Training of code officials is also very important for code enforcement. Training of code
officials and inspectors is a large part of the BCEGS rating for a community. Courses are
offered through the building code associations to help local officials understand
standards that apply to seismic, wind and flood hazards.
Construction of state buildings and some other government buildings is exempt from
municipal or county regulations. The Illinois Capital Development Board (COB) is the
construction management agency for state projects, such as prisons, college and
university classroom buildings, mental health hospitals and state parks (Capital
Development Board, N.O.). The COB recognizes local building codes, but does not require
a permit or inspection from the local building department. The agency will soon be
adopting the International Codes for its use.
The DuPage County Building and Zoning Department participates in the plan review of all
buildings and structures for County Buildings, and for developments by the DuPage
County Forest Preserve District to provide an added dimension of review to ensure life
safety.
Table 4-1 lists building code adoptions in use within DuPage County.
Safe Rooms: A safe room is a room or structure designed and constructed to resist wind
pressures and wind-borne debris impacts during an extreme-wind event. Communities in
DuPage County that adopt the 2015 IBC, sections 423.3 and 423.4, now have the
requirement that a storm shelter (that meets or, exceeds ICC 500) must be constructed
in any new schools, 911 call stations, emergency operation centers, fire stations and
police stations. Communities may choose to expand this requirement to other new
construction in their community. Although school construction does not require a local
building permit, the State of Illinois, as of January 1, 2015, requires storm shelters for all
new school construction. The school building code language from 105 ILCS 5/2-3.12
reads as follows:
"After the effective date of this amendatory Act of the 98th General Assembly, all new
school building construction governed by the "Health/Life Safety Code for Public
Schools" must include in its design and construction a storm shelter that meets the
minimum requirements of the ICC/NSSA Standard for the Design and Construction of
Storm Shelters (ICC-500), published jointly by the International Code Council and the
National Storm Shelter Association. Nothing in this subsection (e-5) precludes the
design engineers, architects, or school district from applying a higher life safety
standard than the ICC-500 for storm shelters" (Illinois General Assembly, 2015).
Within the 2017 Natural Hazard Mitigation Plan Annual Report, 23 communities listed
the development of safe rooms as a continued priority. Communities are also
encouraged to include safe rooms within their emergency operations plans.
Preventative Measures 4-4 2018
Natural Haza1d Mitigation Plan
Tab le 4-1
Building Codes Used i n DuPage Cou nty and BCEGS Rati n gs
Building Code BCE GS Bu ild i ng Code BCE GS
Residential Residential• Commercia l Commer c ia l•
Village of Addison IRC 2012 3 IBC 2012 3
City of Aurora IRC 2015 4 IBC 2015 4
V illage of Bartlett IRC 2012 4 I BC 2012 3
Village of Bloomingdale I RC 2015 3 IBC 2015 3
Village of Bensenville IRC 2015 --IBC 2015 --
Village of Burr Ridge IRC 2012 4 IBC 2012 4
Village of Carol Stream IRC 2012 2 IBC 2012 2
V illage of Clarendon Hills I RC 2006 --IBC 2006 --
City of Darien I RC 2012 --IBC 2012 --
Village of Downers Grove I RC 2015 3 IBC 2016 3
City of Elmhurst I RC 2012 --IBC 2012 --
Village of Glendale Heights I RC 2006 2 I BC 2006 2
Village of Glen Ellyn I RC 2009 --IBC 2009 --
Village of Hanover Park I RC 2012 2 I BC 2012 2
Village of Hinsdale I RC 2006 --IBC 2006 --
Village of Itasca I RC 2006 9 I BC 2006 9
Village of Lisle I RC 2015 4 I BC 2015 4
Village of Lombard I RC 2012 4 I BC 2012 3
City of Naperville I RC 2012 4 I BC 2012 4
Village of Oak Brook I RC 2015 4 I BC 2015 4
City of Oakbrook Terrace I RC 2009 --I BC 2009 --
Village of Roselle I RC 2006 8 I BC 2006 8
Village of Villa Park I RC 2009 5 I BC 2009 5
City of Warrenville I RC 2015 9 I BC 2015 9
Village of Wayne I RC 2015 4 I BC 2015 3
City of West Chicago I RC 2015 --IBC 2015 --
Village of Westmont IRC 2012 --IBC 2012 --
C ity of Wheaton IRC 2012 4 IBC 2012 4
Village of Willowbrook IRC 2009 4 IBC 2009 4
Village of Winfield I RC 2015 --I BC 2015 --
City of Wood Dale I RC 2012 --I BC 2012 --
Village of Woodridge I RC 2012 --I BC 2012 --
D uPage County County 4 I BC 2015 4
. . . . •Information 1s based on Natural Hazard M 1llgat1on Plan Annual Reports I existing County data and may not be accurate .
Preventative Measu res 4-5 2018
Natural Hazard Mitigation Plan
4.2 Planning and Zoning
Planning and zoning activities, such as land use plans, transportation plans, subdivision
ordinances, zoning code and economic re-development plans, can be used to direct
development away from hazardous areas. For example, comprehensive land use plans
can designate floodplains and wetlands as areas for open space, wetlands, or low
density residential. Table 4-2 shows the communities in DuPage County with adopted
comprehensive plans, zoning ordinances, and subdivision ordinances. The table also
highlights communities where flood or other hazards are addressed.
Comprehensive Plans: Comprehensive Plans are the primary tools used by communities
to address future development. They can reduce future flood-related damages by
indicating open space or low density development within floodplains and other
hazardous areas. Natural hazards should be emphasized in specific land use
recommendations. In addition to developing community specific plans, over the last
several years the County and several communities have engaged in the Local Technical
Assistance {LTA) Planning Grant Program, offered by the Chicago Metropolitan Agency for
Planning (CMAP). This program enables communities within the Chicago Land Region to
gain funding for projects if deemed appropriate by CMAP within the areas of
transportation, land use, environmental, and stormwater planning. Examples of
comprehensive planning can be found in both the text below and Table 4-2.
Addison: On January 7, 2013, the Addison Village Board unanimously adopted a new
comprehensive plan, developed through CMAP's LTA Program. "Despite being a "built-
out" community with a range of thriving land uses, Addison presents unique
opportunities for improvements to its built and unbuilt environment. Infill development
will continue to shape the community's physical, economic, and social character, while
regional changes caused by the O'Hare airport expansion project and new western
access to O'Hare will impact development decisions in the Village's foreseeable future.
As a result, Addison will be faced with numerous near -and long-term decisions. Having
an up-to-date Comprehensive Plan in place provides a context in which decisions
affecting the future of Addison can be made with some certainty that today's choices -
whether large or small -contribute to achieving the long-term goals and vision of the
community" (Village of Addison, 2013, P. 2).
Aurora: Currently, the City of Aurora is developing an updated Downtown Master Plan
through CMAP's LTA Program. "The City of Aurora is leading an effort to update,
complement, and enhance the 2005 Seize the Future Master Plan, with a component
ded icated to developing the transportation opportunities and walkability of downtown.
The new Downtown Master Plan will provide policy direction in the areas of sustainability,
economic development, open space and recreation, arts and culture, and other quality-
of-life factors. Once complete, the plan will recommend policies to help the City and its
residents address identified challenges" (CMAP, 2017a).
Preventative Measures 4-6 2018
Natural Hazard Mitigation Plan
Bensenville: The Village of "Bensenville has been impacted and shaped by the multi-
billion dollar O'Hare Modernization Program. To help the community take advantage of
this major capital project (CMAP, 2017b)" the CMAP LTA Program helped the Village
develop a new Comprehensive Plan. The Comprehensive Plan was adopted by the Village
on January 28, 2015. The Comprehensive Plan built upon the Airport Compatibility Study
from April 2013, addressed stormwater issues, including Silver Creek and Addison Creek
Watersheds, storm sewer and detention basin projects, and outreach and education
programs. In addition, Bensenville is currently working with CMAP's LTA Program to
update its zoning ordinance regulations to better align with the Comprehensive Plan and
updated land use practices (CMAP, 2017c).
Carol Stream: The Village of Carol Stream adopted a new Comprehensive Plan,
developed through CMAP's LTA Program, on June 6, 2016. The plan serves elected
leadership, residents, and businesses focusing on "land use and development,
transportation, parks and open space, infrastructure, and capital improvements
throughout the Village (Village of Carol Stream, 2016, P. 9).
Downers Grove: "In 2011, the Village of Downers Grove applied for [CMAP LTA Program]
assistance to update their existing bicycle and pedestrian plans, which are both over ten
years old, to better integrate the two plans while aligning them with regional goals. The
three main objectives are to develop a comprehensive biking and walking network, to
increase safety throughout the Village by developing a public education and outreach
plan, and to market bicycling and walking throughout the community as viable
transportation options. The effort will include a Pedestrian Infrastructure Report to assist
the Village in developing a biking and walking network that is compliant with the
Americans with Disabilities Act (ADA). While the plan will cover the entire Village, special
attention will be paid to the downtown area, key employment centers, the three Metra
commuter stations, and Pace stops to increase access to jobs and connections to
transit. The Plan was approved by the Village Board in August 2013" (CMAP, N.D.a).
Glen Ellyn: "In 2011 the Village of Glen Ellyn applied to CMAP [LTA Program] for a
Downtown Streetscape and Parking Garage Study that would be used to establish a
pedestrian-friendly downtown, evaluate the locations for two potential parking garages,
explore parking management strategies, improve way-finding, and improve bicycling
conditions for the Village of Glen Ellyn. Following recommendations from the 2009
Downtown Strategic Plan, this plan aims to improve the Village's existing infrastructure
and support current and future downtown residents (when new planned housing units
are added). The proposed streetscape improvements will encourage developers to
construct new housing in the downtown area and increase the density, adding to the
downtown's livability. The study of the potential parking garage locations would evaluate
pros and cons of 5 identified locations to be narrowed down to two. The study would also
build off of several downtown initiatives including: the establishment of a National
Downtown Historic District, a two-way traffic study, and investments made by Metra and
Preventative Measures 4-7 2018
Natural Hazard Mitigation Plan
the Union Pacific Railroad to improve pedestrian safety near rai lroad tracks" (CMAP,
N.D.b).
Hanover Park: "Bui ld ing upon priorities in [the Village of] Hanover Park's 2010
Comprehensive Plan, now CMAP's Loca l Technical Assistance (LTA) Program will help the
Village explore revitalization of the Irvin g Park Road Corridor between Astor Avenue to
the east and Wise Road to the west. CMAP and the Village of Hanover Park selected the
Urban Land Institute Chicago as a partner to advance the project with a two-day
Technica l Assistance Panel (TAP). On Monday, December 17, 2012, the Urban La nd
Institute Chicago (ULI Chicago) released the Irving Park Corridor Technical Assistance
Panel (TAP) report" (CMAP, 2014).
DuPage County: In 2011 and 2012, DuPage County was awarded two LTA Gants.
Working with its partner communities (The Roosevelt Road corridor involved Lombard,
Villa Park, Oakbrook Terrace, Oak Brook, and Elmhurst; the Lake Street corridor involved
Addison, Bloomingdale, Itasca, Roselle, and Hanover Park), DuPage set out to update
both County and municipal land use plans relative to specific transportation corridors of
Lake Street and Roosevelt Road. The combined effort of these projects was to
comprehensively address existing conditions and future developments throughout these
corridors. Activities included specia l management of stormwater and drainage issues
that exist and have come into play in the redevelopment of th ese corridors. These
planning efforts have ensured that development is not focused on the benefit of a single
community, but holi stically addressed with the myriad of factors that goes into
redevelopment of properties, roadways, and infrastructure. Since the Lake Street and
Roosevelt Road Corridors LTA were so successfu l, DuPage applied to receive an
additional grant in 2017. The County (both Building and Zoning and the Department of
Transportation) along with the municipalities of Bensenville, Addison, Wooddale, Itasca
and Villa Park, were awarded an even more robust LTA Grant from CMAP. This grant will
allow a study of the Rt. 83 Corridor in 2018.
Finally, throughout 2016 and 2017, the DuPage County Dep artment of Transportation
also coordinated with CMAP's LTA Program to develop an Elgin O'Hare Area Bicycle and
Pedestrian Plan. "The approximately 70-square-mile study area includ e[d ] ten
municipalities, two counties, and multiple jurisdictions, including severa l transportation
agencies responsible for the facilities and services used by travelers" (CMAP, 2017d).
Zoning Regulations: Zoning codes are the primary tool used to implement
comprehensive p lan guide lines for how land should be developed. Zoning ordinances
usually set minimum lot sizes for each zoning district. Often, developers will produce a
Preventative Measures 4-8 2018
standard grid layout. The ordinance
and the community can a ll ow
flexibility in lot sizes and location so
developers can avoid hazardous
areas.
One way to encourage flexibility is to
use the planned unit development
(PUD) approach. The PUD approach
"is both a type of development and a
regulatory process" which allows
developers "flexibility in t he
configuration of buildings and/or
uses on a site than is allowed in
standing zoning ordinances", and
encourages unified plans (Bengford,
B., 2012, P. 1). Protection
of open space, critical
areas, and floodplain
preservation are important
and common aspects of
PUD designs.
"A typical PUD (project]
would include a cluster of
small lots in conjunction
with a common usable
open space with some
recreational amenities and
a protected natural area
functioning as permanent
open space . This
Natural Hazard Mitigation Plan
Exhibit 4-1
PUD Zoning Example
Conservation Subdivision
Standa'd Subd ivision 40 ae1u .... AA !(In 1·3Ctt IOU' and 30
•O actt$ Y.i!h ol!Jhl $-XI() 1o11 WH ot corr.mon op~n s~c..e
P\Jbric Trail
t'2 tioru.is lol$ based on% ol common e>p()R
~end tralv.M~rt'I pubk ~$)
Exhibit 4-2
PUD Zoning Example
Common
Opcn Spaco
arrangement can benefit _...,,
both sides: A developer : ~ .... _,,,,,..J)'t
gets extra flexibility in ~ ~
configuring lots and "4
.,._.
buildings and perhaps a density bonus and/or reduced infrastructure cost, while the
city/county gets permanent open space and/or other desired amen ities." (Bengford, B.,
2012, P. 1) An example of the PUD approach to planning subdivisions, considering
floodplains can be seen in Exhibit 4 -1 (Bengford, B., 2012, P. 2). A second examp le of
the PUD approach can be seen in Exhibit 4-2 (Bengtord, B., 2012, P. 7), depicting how
th is method can be used throughout an entire area of the community.
Preventative Measures 4-9 2018
Natural Hazard Mitigation Plan
Tab le 4-2
DuPage Count y Planning and Land Use Ordinances
Flooding or Fl ood hazards or
other hazards drainage Requirement
included i n prov isions in t o bury utilities
Comprehensive Comprehensive Zoning Subdivision in Subd iv is io n
Communitv Plan Plan Ord inance Ordinance Ordinance
Village of Add ison 2013 Yes 1973/2005 Yes Yes
City of Aurora 1984/2009 Yes 1923/2015 Yes Yes
Village of Bartlett 1989 Unknown 1978 County• Yes
Vill age of Bensenville 2015 Unknown 2007 County* Yes
Vill age of Bloomingdale 1998 Unknown 1969/2006 County• Yes
Vill age of Burr Ridge 1999 Unknown 196 1/1 997 County• Unknown
Vill age of Carol Strea m 2016 Unknown 2017 Yes Yes
Vill age of Clarendon Hills 1991/2006 Unknown 1930/2006 County* Yes
City of Darien 2002 Unknown 2000 County• Unknown
Village of Downers Grove 2017 Yes 2014 Yes Yes
City of Elmhurst 2007 Unknown 2007 County* Unknown
Village of Glen dale 1995 Yes 1999/2006 Yes Un known
Heicihts
Vill age of Glen Ellyn 2001 Unknown 1989/2013 County* Unknown
Village of Hanove r Park 1998 Unknown 199112004 Yes Unknown
Village of H insdale 1989 Unknown 1989/2006 County' Yes
Village of Itasca 1994 Yes 1959/2006 Yes Unknown
Village of Lisle 2004 Unknown 1970/2005 Yes Yes
Village of Lombard 1998 Yes 1924/1990 County• Unknown
Ci ty of Naperville 2002 Unknown 2006 Yes Yes
Village of Oak Brook 1990 Unknown 2002 Yes Yes
City of Oakbrook Terrace 1986/2003 Unk nown 1990/2006 County• Unknown
Vill age of Roselle 1995 Yes 1985 & Yes Unknown
amended
Vill age of Vill a Park 2009 Yes 1970 County' No
City of Warren vill e 1984 Yes 1989/2012 Yes Yes
Vill age of Wayn e 2005 Unknown 2007 County• Unknown
City of West Chicago 2006 Unknown 2005 County• Unknown
Village of W es tmon t 1998 Unknown 1979 County* Unknown
City of Wheaton 1999 Yes Yes Yes Yes
Village of Willowbrook 1993 Unknown 1960 Yes Yes
Village of W infield 2001 Unknown 1921/1999 Yes Unknown
City of Wood Dale 1997 Yes 1948/2005 Yes Yes
Village of Woodridge 2007 Yes 1986/2005 Yes Yes
Du Page County 2013 Yes 2010 County•JYes Yes CUnincoroorated)
• Re ly on DuPage Countywide Stormwater and Flood Plain Ordinance
Preventative Measures 4-10 2018
Natural Hazard Mitigation Plan
Capital Improvement Plans : Communities use Capital I mp rovement Plans or Community
Investment Programs to guide major public expenditures for the next 5 to 20 years.
Capital expenditures can include roadways, water and sewer lin es, acq uisition of
floodplain open space, and retrofitting of existing public structures to withstand hazards.
The Village of Downers Grove mainta i ns a Community I nvestment Program wh ich
includes $43 million in stormwater improveme nts from 2017 to 2021. In the aftermath
of the 2013 storm/ flood event, Downers Grove completed a Stormwater Project
Analysis t hat identified a total of 21 locations that would be part of a prioritized list of
recommended projects to be completed, valued at over $16 million. The Village a lso has
a cost share program for local drainage problems to assist residents on private property
($60,000 budgeted each year). DuPage County (unincorporated) updates its capita l
improvement plan an nually (DuPage County, 2017); projects include:
• Purchasing repetitive loss propertie s and install additional water sewers, storm
sewer mains, and culverts throughout the Co unty.
• Work ing to rehabilitate damaged and aging bridges around the County.
• Updatin g traffic signal software and insta lling uninterruptab le power supplies
(UPS) to alleviate congestion during power outages and enhance signal
management capabi lities during evacuation scenarios.
• Working to increase flood storage within the communities along the East Bran ch
of the DuPage River that experience frequent flood ing.
• Retrofitting Fawell Dam to allow for proper wildlife migration.
• Extending current drinking water supplies to unincorporated residents.
• Repair and replace aging sanitary sewe r pipes, and update technology within
Wastewater Treatment Plants.
4.3 Subdivision Regulation s
Subdivision regu lations govern how land will be subdivided and sets const ruction
standards. Thes e standards generally address roads, sidewalks, utilities, storm sewers
and drainageways. They can incl ude the fo ll owing haza rd protection standards:
• Requiring that the fina l plat show all hazardous areas.
• Road standards that allow passage of firefighting equipment and snow plows
• Requiring power or phone lin es to be buried
• Minimum water pressures adequate for fire fighting
• Requiring th at each lot be provided with a building site above the f lood level
• Requiring that all roadways be no more than one foot below the flood elevation .
Tab l e 4-2 shows the communities in DuPage County that have adopted subdivision
regu lations, comprehensive plans, and the last update of their zoning ordinance.
Preventative Measures 4-11 2018
Natural Hazard Mitigation Plan
4.4 Stormwater Management
New construction in the floodplain increases the amount of development exposed to
damage and can aggravate flooding on neighboring properties. Development outside a
floodplain can also contribute to flooding problems. Stormwater runoff is increased when
natural ground cover is replaced by urban deve lopment (see Exhibit 4-3). Development
in the watershed that drains to a river can aggravate downstream flooding, overload a
community's drainage system, cause erosion, and impair water quality. An example of
this can be found within Exhibit 4 -3 (Muth C., Brinson L., and Bernhardt, E., 2010, P. 1).
Stormwater management encompasses approaches to protecting exist ing downstream
properties and new construction from damage by surface water, including (but not
lim ited to):
• Regulating development in the floodplain to ensure that it will be protected
from flooding and that it won't d ivert floodwaters onto other properties.
• Regulating all development to ensure that th e post-development peak runoff
will not be greater than
under pre -development
conditions.
• Stormwater runoff
regulations require develop-
ers to build retention or
detention basins to
minimize the increases in
th e runoff rate caused by
impervious surfaces and
new drainage systems.
DuPage County Stormwater
Management is responsible for
administering and enforcing the
ordinance. Communities, based on
their regulatory resources, are granted
partial or complete waiver of County
review of permit application reviews.
Community status is outlined within
Table 4-3.
Exhibit 4-3
Floodplain Development and Stormwater Runoff
2~.~bllow 1nmtlat10n
40% <N;iipotran~p11 0Hon 38% c..-vapo11 an~1rat1on
~ i_t 'K,deep ~ infiftrotk>n
l-fJ:i,~~l:m
J~,%:'~~~ I~~~ Sitrl.C.
DuPage County and all municipalities have adopted the DuPage County Countywide
Stormwater and Flood Plain Ordinance (DuPage County, 2013). The Stormwater
Ordinance established stormwater management and detention requirements, meets or
Preventative Measures 4-12 2018
exceed all of the state and NFIP floodplain
regulatory requirements, provides for wetland
management, and addresses soil eros ion and
sediment control. As a result of this ordinance,
all DuPage County communities participate in
the NFIP; and, all communities are compliant
with Illinois Department of Natural Resources
(IDNR) minimum requirements for regulating
development in the floodplain and in the
floodway: all new buildings must be protected
from the base or 100-year flood and no
development can cause an increase in flood
heights or velocities. Some of the requirements
of the County's Stormwater Ordinance include:
• Buildings must be e levated at least one
foot above the base (100-year) flood
level.
• Fill must meet certain standards to
protect it from erosion and scour.
• Flood storage lost due to filling and
construction must be compen sated for by
• removal of an equal volume of storage.
• Only appropriate uses are allowed in the
floodway.
• Standards for retention and detention
basins, requirements for erosion and
sedimentation control should be
established.
• The requirement to incorporate best
management practices into all plans.
Some communities, such as Downers Grove,
have established additional more stringent
regulations.
Best Management Practices: Point source
pollutants come from pipes such as the outfall
of a municipal wastewater treatment plant. They
are regulated by the U.S. and Illinois
Environmental Protection Agencies. Nonpoint
source pollutants come from non-specific
locations and are harder to regulate.
Preventative Measures 4-13
Natural Hazard Mitigation Plan
Table 4-3
DuPage Countywide Stormwater and
Flood Plain Ordinance Waiver Status
County Stormwater
Community Ordinance W aiver
Village of Addison Complete
City of Aurora Opt Out
Village of Bartlett Partial
City of Batavia Non-Waiver
Village of Bensenville Partial
Village of Bloomingdale Complete
Village of Burr Ridge Partial
Village of Carol Stream Complete
City of Chicago Non-Waiver
Village of Clarendon Hills Partial
City of Darien Partial
Village of Downers Grove Complete
City of Elmhurst Partial
Village of Glendale Heights Partial
Village of Glen Ellyn Complete
Village of Hanover Park Partial
Village of Hinsdale Partial
Village of Itasca Partial
Village of Lemont Non-Waiver
Village of Lisle Partial
Village of Lombard Partial
City of Naperville Partial
Village of Oak Brook Complete
City of Oakbrook Terrace Partial
Village of Roselle Partial
City of St. Charles Opt Out
City of Schaumburg Non-Waiver
Village of Villa Park Complete
City of Warrenville Complete
Village of Wayne Partial
City of West Chicago Partial
Village of Westmont Partial
City of Wheaton Partial
Village of Willowbrook Complete
Village of Winfield Partial
City of Wood Dale Complete
Village of Woodridge Complete
DuPage County Non-waiver (Unincoroorated)
2018
Natural Hazard Mitigation Plan
Examples of nonpoint source pollutants are law n fertilizers, pesticides, a nd othe r farm
chemicals, an i ma l wastes, oi ls from street surfaces and indu stria l a reas and sediment
from agricu lture, construction, m ining a nd forestry. These pollutants a re washed off th e
grou nd's surface by stormwater and flu shed into receiving storm sewe rs, ditc hes and
st reams.
The term "best management pract ices" (BMPs) refers to design, construction and
maintenance practices and criteria that minimize the impa ct of stormwater runoff rates
and volumes, prevent erosion, protect natural resources and capture nonpoint source
pol lu tants (i ncl uding sedi ment). They can prevent in creases in downstream flooding by
attenuating runoff and enhancing infi ltration of stormwater. They a lso m in im ize water
quality d eg radati o n, preserve beneficial natural features onsite, maintain natural base
flows, minimize ha bitat loss, and prov ide multiple uses of drainage and sto rage facilities.
Best manageme nt practices have been in co rporated throughout the County Stormwater
Ordinance. Th e County and communities are a lso working to meet th e req ui re ments of
the Cl ean Water Act, Total Maximum Daily Load (TMD L), and t h e Nationa l Po lluta nt
Discharge Elimination System (NPDES) Phase II requirements.
Erosion and Sedimentation Control : Erosion a lso occurs a lo ng streambanks and
shorelin es as the vo l ume and velocity of fl ow or wave action destabilize a nd wash away
the soil. Sedim ent suspen ded will settle out wh e re flowing water slows down . It can clog
storm sewers, dra i n t il es, cu lverts and ditches , and reduce the water tran sport and
storage capacity of river and stream channels, lakes and wetland s.
Additionally, the sediment often brings chemica ls, heavy meta ls and other pollutants,
and l ight and oxygen are reduced in the stream which impairs water qua lity. Sediment
has been id en tified by t he US Environmental Protectio n Agency (EPA) as the nation's
number on e non point sou rce po llutant for aquatic life.
Techniques to min imi ze eros ion includ e phased construction, minim a l land clearing, and
stab ilizing bare ground as soon as po ssi bl e with vegetation and other soil sta bilizing
practices. If erosio n occurs, oth e r m eas ures a re used to capture sed im e nt before it
leaves the site. Silt fences, sediment traps and vegetated filte r strips are co mmonly used
to control sediment transport. Ru noff from the site ca n be s towed down by terraces,
contour strip f arming, no-till farm practices, hay or straw ba les, constructed wetla nds,
a n d impou ndme nts (e .g., sed i ment basins and farm ponds). Slowing surface water runoff
on the wa y t o a drainage channe l increases infiltration into the soi l and reduces th e
vo lume of topso il eroded from the site.
Standards for soi l eros ion and sedim ent co ntro l during and fo llowing project construction
a re components of the County Stormwater Ordinance. Erosion a nd sedi ment control
planning is required in the initial site planning process.
Preventative Measures 4-14 2018
Natural Hazard Mitigation Plan
4.5 Hazard M a pping
Floodplain maps may be used t o he l p determin e whethe r or not a DuPage County
property is located in the regu latory floodplain . The current effective Digital Flood
Insurance Rate Maps (DFIRMs), issued by the FEMA, identify various flood zones and are
used by the NFIP for rat ing flood insurance po l icies and enforcing federal mandatory
insurance purchase requirements. On Jun e 1, 2017, the FEMA issued Revised
Preliminary Digital Flood Insurance Rate Maps (DF IRM ) to a ll com mun ities in DuPage
Coun ty. It is projected that these maps will become effective sometime in 2018 or later.
It shou ld be noted that whi le the current effective DFIRMs are based on th e National
Geodetic Vertica l Datum (NGVD) of 1929, the Revised Preliminary DFIRMs are based on
the North Am e rican Vertica l Datum of 1988 (NAVO 88). DuPage County has created
a Revi se d Pre l iminary DFIRM Map Compare Ap p l ic ation that all ows the public to qu ickly
compare th e n e w Revised Pre li m i nary DF IRM s to the 2004 DFIRMs" (DuPage Co u nty,
N.D.).
Deve l opment i n the Fl oodpla in: "The DuPage County Regulatory Flood Maps (RFMs) are
for use in adm in iste ri ng the DuPage Regulatory Flood Program . For a ll development in
the floodplain, it is required that users consu lt the current RFM, current effective DFIRM
and the Preliminary DF IRM. The DuPage County RFMs were created using the same
in fo rmation used t o c reate the 2004 DFIRMs. Th e maps are used as a planning tool on ly
and cannot be used to definitively determine whether or not a property is l ocated in the
floodplain. Fl oodplain maps do not necessarily identify a ll areas subject to fl ood ing. Site
specific fl oodplain, depressional storage areas and local dra inage sources of small size
are not a lways represented on the floodplain maps. Actual floodplain boundaries may be
sli ghtly different than those shown on the maps due to variations in topography. Th e
community map repository should be consulted for possible updated or additiona l flo od
haza rd information, such as FEMA Letter of M ap Change (LOMC) or Letter of Map
Revis ion (LOMR) information . Please refere nce th e DuPage County Countywide
Stormwater & Flood Plain Ordinance for regulatory information " (DuPage County, N.D.).
Severa l commun it ies, i nc lud in g Glen Ellyn and Down ers Grove, have a lso deve l oped
com munity spec ific hazard maps for loca l d epression s in th e topography. There are
additiona l r estrictions on development within these areas. Downers Grove requires
compensato ry storage and other floodplain typ e restrictions within the areas referred to
as Locally Poor Drainage Areas (LPDA). Th e re are over 100 of th ese mapped areas
th rough out Downers Grove .
Preventative Measures 4-1 5 2018
Natural Hazard Mitigation Plan
4.6 Conclusions
1. Building codes are the prime preventive measure for tornadoes, high winds, snow
storms, and earthquakes. Rigorous enforcement of the latest available building
codes, with an adequately trained staff provides a more sustainable community.
In addition, it is important for communities to continue to update its Building and
Zoning Codes on a regular basis as DuPage County has done in 2016 to implement
new trends in design and safety standards promulgated by the industry.
2. The County and many communities have adopted the International Code series such
as the 2015 International Code Council (International Bui lding Code, International
Fire Code, International Mechanical Code, International Fuel Gas Code, International
Property Maintenance Code), 2014 National Electric Code, 2015 Illinois Energy
Efficient Building Code and the current Illinois State Plumbing Code, which provides
better protection from natural hazards.
3. Based on the National Building Code Effectiveness Grading Schedule (BCEGS),
administration of building codes in DuPage County is generally good. Most
communities have residential and commercial ratings of 5, and many have achieved
a rating of 4 or better.
4. The majority of the comprehensive and land use plans address floodplains and the
need to preserve these hazardous areas from intensive development. However, many
zoning ordinances do not designate flood prone areas for any special type of land
use.
5. The County Stormwater Ordinance's provisions for floodplain development and
stormwater management regulations exceed minimum national and State standards
and will be helpful in preventing flood problems from increasing.
4. 7 Recommendations
1. All communities should adopt the latest International Codes, the new national
standard that is being adopted throughout the country. Current efforts by multi-
community organizations of building departments to develop local amendments for
regional consistency should be pursued, provided they produce equivalent natural
hazard protection features.
2. Communities should work to improve their BCEGS rating, with a target of reaching or
maintaining at least a Class of 5 or better in time for their next cycle visit by the
Insurance Services Office.
3. On a regional basis, municipal and County code enforcement staffs should work
together to:
Preventative Measures 4-16 2018
Natural Hazard Mitigation Plan
• Develop building code language to strengthen new bui l dings against damage by
high winds, tornadoes, and hail.
• Adequately regu late mobile/manufactured structure installation for a ll uses,
including residential, commercial, and schools.
4. On a regional basis, municipal and county planning and engineering staff should
develop examp le subdivision ordinance language that requires new infrastructure to
have hazard mitigation provisions, such as secondary access to subdivisions.
5. Offices respons ible for design, construction or permitting critical facilit ies should
ensure that the design accounts for natura l hazards and adjacent land uses.
6. The public, deve l opers , bu il ders, and decision makers should be informed abo ut the
hazard mitigation benefits of these preventive measures and the procedu res that
shou ld be fo ll owed to e nsu re th at new deve lopments do not crea t e new pr ob l ems.
7. Communiti es need to un derst and and consistent ly enforce the County-W ide
Stormwater and Flood Plain Ordinance provisions. All communities shou l d enforce
the wet l and protection, erosion and sediment control and best management
practices provisions of the County-Wide Stormwate r and Flood Plain Ordinance . The
DuPage County municipa l engineers group should continue their efforts in these
areas.
Preventative Measures 4-17 2018
Natural Hazard Mitigation Plan
References
Bengford, B. (2012, November 1). Planned Unit Developments -Real Word Experiences.
Retrieved on: December 22, 2017. Retrieved from: http://mrsc.org/Home/Stay-
lnformed/MRSC-lnsight/November-2012/Planned-Unit-Oevelopments-Real-World-
Experiences.aspx
Capital Development Board. (N.D.) About COB. Retrieved on: December 26, 2017.
Retrieved from: https://www.iiIinois.gov/cd b/about/Pages/ def a ult.aspx
Chicago Metropolitan Agency for Planning (CMAP). (N.D.a). Downers Grove. Retrieved on:
January 16, 2018. Retrieved from:
http://www.cma p. ii Ii nois.gov /programs/Ital downers-grove
Chicago Metropolitan Agency for Planning (CMAP). (N.D.b). Glen Ellyn. Retrieved on:
January 16, 2018. Retrieved from: http://www.cmap.illinois.gov/programs/lta/glen-
ellyn
Chicago Metropolitan Agency for Planning (CMAP). (2014, December 23). A Corridor
Study for Hanover Park. Retrieved on: January 16, 2018. Retrieved from:
http://www.cmap.illinois.gov/programs/lta/hanover-park
Chicago Metropolitan Agency for Planning (CMAP). (2017a, November 14). A Downtown
Master Plan for Aurora. Retrieved on: January 16, 2018. Retrieved from:
http://www.cmap.illinois.gov/programs/lta/aurora
Chicago Metropolitan Agency for Planning (CMAP). (2017b, October 27). A
Comprehensive Plan for Bensenville. Retrieved on: January 16, 2018. Retrieved
from: http://www.cma p. ill i nois.gov /progra ms/lta/bense nvi lie
Chicago Metropolitan Agency for Planning (CMAP). (2017c, October 27). A Zoning
Ordinance for Bensenville. Retrieved on: January 16, 2018. Retrieved from:
http://www.cmap.illinois.gov/programs/lta/bensenville-zoning
Chicago Metropolitan Agency for Planning (CMAP). (2017d, November 14). Elgin O'Hare
Area Bicycle and Pedestrian Plan. Retrieved on: January 16, 2018. Retrieved from:
http:j/www.cmap.illinois.gov/programs/lta/dupage-elgin-ohare-bike-ped
DuPage County, Illinois. (N.D.). Floodplain Identification in DuPage County. Retrieved on:
December 26, 2017. Retrieved from:
http://www.dupageco.org/EDP/Stormwater Management/51893/
DuPage County, Illinois. (2013, April 23). Countywide Stormwater and Flood Plain
Ordinance. Retrieved on: December 22, 2017.
DuPage County, Illinois. (2017). DuPage County 2017 Capital Improvement Plan.
Retrieved on: December 22, 2017. Retrieved from:
https://dupagecapitalplan.com/all-projects/
Federal Emergency Management Agency (FEMA). (2017b). National Flood Insurance
Program Community Rating System Coordinator's Manual. Retrieved on: December
7, 2017. Retrieved from: https://www.fema.gov/media-librarv-
da~/1493905477815-
d794671adeed5beab6a6304d8ba0b207 /633300 2017 CRS Coordinators Manu
al 508.pdf
Preventative Measures 4-18 2018
Natural Hazard Mitigation Plan
Illinois General Assembly. (2015). 105 ILCS 5/2-3.12. School building code. Retrieved
on: January 16, 2018. Retrieved from:
http://www.ilga.gov/legislation/ilcs/fulltext.asp?DocName==010500050 K2-3.12
Muth C., Brinson L., and Bernhardt, E. (2010). Mud Creek Case Study, Explanation.
Retrieved on: December 22, 2017. Retrieved from:
http://www. learn nc.org/lp/ editions/ m udcreek/ 63 94 ?style== print
Village of Addison. (2013, January 7). Village of Addison Comprehensive Plan. Retrieved
on: January 16, 2018. Retrieved from:
http://www.cma p.illi nois.gov I documents/ 10180/16921/ FY 13-
0055+ADDISO N+L TA+PLAN+lowres.pdf/8b58ba03-bd81-4241-8168-
d9526b5852ba
Village of Carol Stream. (2016, June). Village of Carol Stream Comprehensive Plan.
Retrieved on: January 16, 2018. Retrieved from:
http://www.cmap.illinois.gov/documents/10180/248066/FY16-
0086+CAROL +STREAM+PLAN+lowres.pdf/3303ad07-c3fb-4115-8be3-
3addf3ebe938
Preventative Measures 4-19 2018
Natural Hazard Mitigation Plan
Chapter 5 -Property Protection
Property protection mitigation (FEMA, 2017) measures are used to modify a building or a
property that is subject to a hazard; reducing potential damage. Property protection
measures fall under three approaches:
• Modify the site to keep the hazard from reaching the building,
• Modify the building so it can withstand the impacts of the hazard, and
• Insure the property to provide financial relief after the damage occurs.
Property protection activities include (FEMA, 2017a, P. 510-20):
• Relocation
• Acquisition
• Building Elevation
• Retrofitting
• Sewer Backup Protection
• Insurance
''For floodplain management purposes, a structure is a walled and roofed building,
including a gas or liquid storage tank, that is principally above ground, as well as a
manufactured home. The terms "structure" and "building" are interchangeable in the
National Flood Insurance Program (NFIP). Residential and non-residential structures are
treated differently. A residential building built in a floodplain must be elevated above the
Base Flood Elevation (BFE). Non-residential buildings may be elevated or floodproofed."
(FEMA, 2017b).
5.1 Barriers, Elevation, Relocation, and Acquisition
For the hazards considered in this plan, flooding is the one hazard that can be kept away
from a building (FEMA, 2017c). There are four common methods to do this:
• Erect a barrier between the building and the source of flooding
• Move the building out of the flood prone area
• Elevate the building above the flood level
• Demolish the building
The advantages and disadvantages to these four methods will be discussed below.
Generally, floods do not damage vacant areas. The major impact of hazards is to people
and improved property. In some cases, properties can be modified so the hazard does
not reach the damage-prone improvements. A fire break is an example of this approach -
brush and other fuel are cleared away from the building so a fire may not reach it. Exhibit
5-1 outlines barrier effectiveness (Village of South Holland, 2017).
Barriers: A flood protection barrier can be built of dirt or soil ("berm") or concrete or steel
("floodwall"). Berms take up more space than floodwalls, but floodwalls are more
expensive than berms.
Property Protection 5-1 2018
Natural Hazard Mitigation Plan
Exhibit 5-1 Careful design is needed so as not to create
flooding or drainage problems on neighboring
properties. If the ground is porous and if
floodwaters will stay up for more than an hour
or two, the design needs to account for leaks,
seepage of water underneath, and rainwater
that falls inside the perimeter.
Small barriers can be effective against shallow
flooding.
Barriers can only be built so high and can be
overtopped by a flood higher than expected.
Barriers made of earth are susceptible to
erosion from rain and floodwaters if not
properly sloped, covered with grass, and
maintained. A berm can settle over time,
FLOOPWATEll\
lowering its protection level. A floodwall can crack, weaken, and lose its watertight seal.
Therefore, barriers need careful design and maintenance (and insurance on the building,
in case of failure).
Relocation: Moving a building to higher ground is the
surest and safest way to protect it from flooding.
Relocation of a building can be to a new property outside
of the floodplain, or, for large lots, to a higher location
(outside of the floodplain) on the existing property. Any
building can be moved; however, the cost goes up for
heavier structures, such as those with exterior brick and
stone walls, and for large or irregularly shaped buildings.
Exhibit 5-2 shows an example of a building being
relocated (FEMA, 2017d).
Building Elevation: Raising a building above the flood
level can be almost as effective as moving it out of the
floodplain. Water flows under the building, causing little or
no damage to the structure or its contents.
Raising a building above the flood level is cheaper than
moving it and can be less disruptive to a neighborhood.
Elevation has proven to be an acceptable and reasonable
means of complying with floodplain regulations that require
new, substantially improved, and substantially damaged
buildings to be elevated above the base flood elevation.
Exhibit 5-2
Small wood frames are the
easiest to relocate
Exhibit 5-3
Home Elevation
Elevating a building will change its appearance. If the required amount of elevation is low,
the result is very much like putting a building on a 2 or 3 foot-high crawlspace (see
example to the right). If the building needs to be raised more than four feet, owners are
concerned that it will stick out like a sore thumb, and they may decline to implement an
elevation project. Yet, many owners have successfully and attractively {with stairs and
Property Protection 5-2 2018
Natural Hazard Mitigation Plan
landscaping) elevated their homes more than eight feet. Exhibit 5-3 illustrates a home
elevation (FEMA, 2017 e ).
Another problem with this approach is with basements. Only the first floor and higher are
elevated on a new flow through foundation. All utilities are elevated and the basement is
filled in to protect the walls from water pressure. The owner loses the use of the
basement, which may deter him or her from trying this approach.
A third problem with elevation is that it may expose the structure to greater impacts from
other hazards. If not braced and anchored properly, an elevated building may have less
resistance to the shaking of an earthquake and the
Exhibit 5-4 pressures of high winds. Careful design and construction,
however, should prevent these secondary problems.
Building Demolition
Demolition: If a home has been heavily damaged and
susceptible to future damage, it is safest for owners to
relocate. Acquisition, followed by demolition, is most
appropriate for'buildings that are dilapidated and are not
worth protecting, but acquisition and demolition should
also be considered for structures that would be difficult to
move-such as larger, slab foundation, or masonry
structures. Generally, demolition projects are undertaken
by a government agency, so the cost is not borne by the
property owner, and the land is converted to public use, such as a park. Exhib it 5-4 shows
an example of a building being demolished (FEMA, 2017f).
One problem that sometimes results from an acquisition and demolition project is a
"checkerboard" pattern in which nonadjacent properties are acquired. Creating such an
acquisition pattern in a community adds to the maintenance costs that taxpayers must
support (FEMA, 2017g).
The Village of Lisle has elevated four homes since the floods of 2013, has completed the
demolition of two homes, and as of 2016 was working to demolish an additional four.
Local Implementation: the DuPage County Countywide Stormwater and Floodplain
Ordinance includes floodplain building protection standards, see below for details:
15-28.A Within the boundary of the regulatory flood plain, all usable space in new
buildings, or added to existing buildings, shall either be elevated, flood proofed, or
otherwise protected such that the lowest entry shall be at least one foot above the
nearest base flood elevation to prevent the entry of surface stormwater. Floodproofing
devices shall be operational without human intervention. If electricity is required for
protection against flood damage, there shall be a backup power source which will
activate without human intervention. Flood proofing measures shall be certified by a
professional engineer.
Property Protection 5-3 2018
Natural Hazard Mitigation Plan
15-28.B All usable space in new buildings or added to existing buildings, shall be
elevated, flood proofed, or otherwise protected to at least one foot above the design
elevation to prevent the entry of surface stormwater. The design elevation is the
higher el evation of either Article X or the elevation associated with t he design rate as
determined in Section 15-81.B.2 .
15-28.C Oth er building protection standards for structures that may be imp lemented
in the flood plain are li sted in Section 15-81.B in Article X.
Fo llow i ng the Apri l 2013 floods, the V ill age of Lisle declared more than 25 structures
substantially damaged. In addition to Village and County buyouts and demolitions, three
structures -a single family home, a restaurant, and a nursing hom e -were private ly
de mo l ish ed . Three homes in Lisle have been e levated, and five more are planned . Tab l e
5-1 lists the f lood prone property acqu isiti ons throughou t th e County s in ce the 1980s.
Communities like Carol Stream, Downers Grove and Lisle have had structures experience
flooding/repetitive flooding over the last 15-20 years, through l oca l funds and federal
grants these communities and/or DuPage County Stormwater has .been able t o acquire
nearly 50 flood prone properties since 2013.
Table 5-1
DuPage County Flood Prone Property Acquisitions
Community Wate rshed
Village of Addison Salt Creek
Village of Carol Stream West Branch I Klein Creek
City of Darien Sawmill Creek
Village of D owners East Branch DuPage
Grove River
City of Elmhurst Salt Creek
Village of Lisle East Branch DuPage
River
Village of Rose lle Salt Creek/Spring Brook
Village of Villa Park Salt Creek
City of Warrenville West Branch DuPage
River
City of Wheaton East Branch DuPage
Rive r/Winfield Creek
Village of Winfield West Branch DuPage
River
City of Wood Dale Salt Creek
DuPage County East Branch DuPage
River
DuPage County Stormwater Management (DCSM)
DuPage County Forest Preserve District (DCFPD)
Location
Salt Creek
llini/Silverlead/Mohican
Crest Road
St. Joseph Creek
Monterey Avenue
Garfield/Lincoln
River/Dumoulin
Rosell e Road
Riverside
CourUElsworth/Monterev/Euclid
River Rd
Main
StreeVDorchester/Williston
Park StreeVBeecher Ave
Forest Ave
V alley View (Uninc. DuPage)
Illinois Department of Natural Resources, Office of Water Resources (IDNR)
Federal Emergency Management Agency (FEMA)
Property Protection 5-4
Numbe r of Participating
Acquisitions Agencies
4 IDNR, FEMA
6 Village/IEMA.DCSM
4 DCSM
4 Village
3 IDN R
43 Village, DCSM
2 Village/DC SM
7 Village/HMPG/DCEO-
PBP/HMGP-DR
2 DCSM, IDNR
6 DCSM, City
3 DCSM
FEMA, I DNR,
10 DCFPD, City, Park
District
47 DCSM, FEMA
2018
Natural Hazard Mitigation Plan
5.2 Retrofitting -Modify the Building
Section 5.1 focuses on keeping the hazard from reaching a building or damage-prone
part of a property. An alternative is to modify or "retrofit" the site or building to minimize
or even prevent damage. There are a variety of techniques to do th is. This section looks
at the measures that can be implemented to protect existing buildings from damage by
floods, sewer backup, earthquakes, tornadoes, summer and winter storms.
Flood Retrofitting -Buildings: Flood retrofitting measures (FEMA, 2012) include dry
floodproofing where all areas below the flood protection level are made watertight. Walls
are coated with waterproofing compounds or plastic sheeting. Openings (doors, windows,
and vents) are closed, either permanently, with removable shields, or with sandbags.
Dry flood proofing: Dry flood proofing of new and existing nonresidential buildings in the
regulatory floodplain is permitted under State, FEMA and County regulations. Dry
flood proofing of existing residential buildings in the floodplain is also permitted as long as
the building is not substantially damaged or be ing substantially improved. Owners of
buildings located outside the regulatory floodplain can always use dry flood proofing
techniques.
Wet Flood proofing: The alternative to dry flood proofing is wet flood proofing: water is let in
and everything that could be damaged by a flood is removed or elevated above the flood
level. Structural components below the flood level are replaced with materials that are
not subject to water damage. For example, concrete block walls are used instead of
wooden studs and gypsum wallboard. The furnace, water heater, and laundry facilities
are permanently relocated to a higher floor. Where the flooding is not deep, these
appliances can be raised on blocks or platforms.
Wet floodproofing has one advantage over the other approaches: no matter how little is
done, flood damage is reduced. Thousands of dollars in damage can be prevented by
simply moving furniture and electrical appliances out of a basement.
A th ird flood protection modification addresses flooding caused by overloaded sanitary or
combined sewers. Four approaches may be used to protect a structure against sewer
backup: floor drain plugs, floor drain stand-pipes, overhead sewers, and backflow
protection valves.
The first two devices keep water from flowing out of the lowest opening in the building,
the floor drain. However, if water becomes deep enough in the sewer system, it can flow
out of the next lowest opening, such as a toilet or tub, or it can overwhelm a drain plug by
hydrostatic pressure and flow into the building through the floor drain. The other two
measures, overhead sewers and backflow protection valves keep water in the sewer line
during a backup. These are more secure, but more expensive. For dry floodproofing, wet
flood proofing, and sewer backup prevention, it is important to consider what contents of
a build ing are suitable for keeping in basements or crawl spaces. Valuable and invaluable
items, such as, photographs, should be kept elsewhere if the seepage or flooding occurs
even with the retrofitting measures in place.
Property Protection 5-5 2018
Natural Hazard Mitigation Plan
Overhead Sewers: Most f lood proofing activities in the County consist of overhead sewer
i nsta llations. Communities that have programs related t o overhead sewers, including
rebates, incl ude: DuPage County, Lis le, Bensenvi ll e, Aurora, Addison , Bloom ingdale,
Darien, El mhu rst, Rose ll e, Downers Grove San itary District {wh ich serves Downers Grove
and parts of Westmont, Woodridge, Lisle, Oak Brook, and Darien), Glen Ellyn, Villa Park,
Whea t on Sa n itary District (wh ich serves Wheaton and parts of Caro l Stream, Glen Ellyn,
and Winfield), and Lombard. In addition, some communities such as Downers Grove and
Lombard also provide assistance for backya rd drainage. For more information on
comm u n ity ass istance, see Tab le 5-2.
Table 5-2
D u Page Cou nty Fl oodproofing Assistance Efforts
Overhead Financial Technical Community Sewers or Assistance Assistance Other Efforts
Floodproofing
Village of Addison Yes Yes Yes Overhead sewer required with new
construction
City of Aurora Unknown Yes Unknown Unknown
Village of Bartlett Yes Yes Yes Overhead sewer required with new
construction
Villaae of Bensenville Yes Yes Unknown Back-Yard /Side-Yard Elevation Proaram
V illaae of Bloominadale Unknown Yes Yes Overhead sewer reauired with new construction
Village of Burr Ridge Unknown Unknown Unknown Overhead sewer required with new construction
VillaQe of Carol Stream No No Yes Unknown
VillaQe of Clarendon Hills Unknown Unknown Yes Overhead sewer reouired with new construction
City of Darien No Yes Unknown Unknown
Village of Downers Grove Yes Yes Yes Overhead sewer required with new
construction
City of Elmhurst Some Yes Unknown Unknown
Village of Glendale Unknown Yes New sewer system and WTP has reduced
H eiahts Unknown oroblems
VillaQe of Glen Ellyn Yes Yes Yes Overhead sewer reouired with new construction
VillaQe of Hanover Park Unknown Unknown Unknown Unknown
VillaQe of Hinsdale Unknown Unknown Unknown Overheads reouired bv sanitarv district
Villaae of Itasca Unknown Unknown Unknown Unknown
VillaQe of Lisle Yes Yes Yes Unknown
Villaae of Lombard Yes Yes Yes Backyard proaram
City of Naperville Yes Unknown Unknown Overhead sewer required with new construction
Village of Oak Brook Unknown Yes Unknown Unknown
Citv of Oakbrook Terrace Unknown Unknown Unknown Unknown
Villaae of Roselle Unknown Yes Unknown Overhead sewer required with new construction
Village of V illa Park Unknown No Yes Overhead sewer reauired with new construction
City of Warrenvill e No No Yes Overhead sewer required with new
construction
Village of Wayne No No Unknown Site visits to detennine if sanitary sewer
problems
Citv of West Chicaoo Unknown Unknown Unknown Unknown
Vill aae of Westmont Unknown Yes Unknown Eiectors reauired
City of Wheaton Unknown Yes Yes Overhead sewer reauired with new construction
VillaQe of Willowbrook Unknown Unknown Yes Overhead sewer reouired with new construction
Villaae of W infield Yes Yes Unknown Unknown
City of Wood Dale No Yes Unknown
Woodridge Unknown Yes Unknown In village code and through program
DuPage County --Yes ----
Property Protection 5-6 2018
Natural Hazard Mitigation Plan
Tornado Retrofitting: Tornado retrofitting measures include
constructing an un.derground shelter or "safe room" at the
first-floor leve l to protect the lives of the occupan t s. Their
worth has been proven by recent tornadoes in Oklahoma,
as shown in Exhibit 5-5 (FEMA, 2017h).
Safe rooms are built by connecting all parts of the she lter
together (walls, roof and foundation) using adequate
fasteners or tie downs. These help hold the safe room
together when the combination of high wind and pressure
differences work to pull the walls and cei lin g apart. The
Exh i bit 5-5
Tornado Safe Room .
walls of the safe room are constructed out of plywood and metal sheetin g to protect
people from wind borne missi les (flying debris) with the strong winds of a tornado.
Another retrofitting approach for tornadoes and high winds is to secure the roof, wa lls
and foundation with adequate fasteners or tie downs. These help hold the building
together when the combination of high wind and pressure differences work to pull the
bu i lding apart. This measure also applies to manufactured homes.
Summer Storm Retrofitting: Retrofitting approaches to protect private or public buildings
from the effects of thunderstorms includ e:
• storm s hutters
• lightni ng rods
• strengthening connections and tie-downs
• impact-resistant glass in window panes
• surge protectors at electrica l outlets
Roofs could be replaced with materials less susceptible to damage by hail, such as
modifi ed aspha lt or formed stee l shingl es.
/l
Seve re Winter Storm Retrofitting: Winter storm retrofitting measures in clu de im proving
insulation on o lder buildings and relocating water lines from outside walls to interio r
spaces. Windows can be sealed or covered with an extra layer of glass (storm windows) or
plastic sheeting. Roofs can be retrofitted to shed heavy loads of snow and prevent ice
dams that form when snow melts.
Earthquake Retrofittin g -Buildings: Earthquakes, or seismic events, present two hazards
for buildings and people -a hazard for the structure itse lf and a hazard for the bui lding's
contents (non-structural hazard). Earthquake retrofitting measures for the structure
include:
• removing masonry overhangs that wi ll fa ll onto the street during shaking
• bracing the wa lls of the building provides structural stability
• boltin g sill plates to the foundation
These measures can be very expensive and should be cons idered for buildings on a case
by case basis.
Property Protection 5-7 2018
Natural Hazard Mitigation Plan
Meas u res t hat p rotect aga in st non-st ructura l seismic hazards (Californ ia Seis mi c Safety
Co mmiss ion, 2006) typ ica lly invol ve sma ll modificatio ns. Ret rof itti ng act ivitie s for non -
structural haza rd s i nc lud e:
• Tyin g do wn a ppliances, water hea t ers, bookcases, and fragil e furniture so they
won't f a ll over du r in g a quake
• Insta ll ing latches on dra we rs and cab i net doors
• Mounting picture fra m es an d mirrors secure ly
• Insta l ling f lexible utility connect ions for water an d gas lines
• Anchoring and bracing propane t anks a nd gas cy linde rs
Th ese ap proac hes ca n be very cos t effective a nd have little or no impact on the
appearance of a bui ldin g, yet they a re im portan t m eas ures fo r k eep in g buildings safer
and protecting lives during ea rthqu a k e events.
Wh ile t hese s im ple and i nexpensive measures may be cost effective for a hom e o r
business, they may not be s ufficie nt for protection of cr itical facilities. Fire stations need
to b e s ure t hat they can open their doors and hospitals must be strong enough t o
co n ti n ue opera t i ng during the s hocks and afters hocks. Again, cr it ica l faci lities shou ld be
eva luated on a case by case ba si s.
Earthquake Retrofitting -Infrastructure and Lifelines: Infras tru cture harde n ing, atte ntio n
t o life lin es a nd brid ge strengthening are i mpo rta nt elements of ea rth quak e mitigation
(F EMA, 1 9 9 6).
Lifel i nes are t he pub lic works and utility syst ems t hat su pport most human
act ivities: individua l, fa mi ly, economic, politica l, and cultura l. The various lifelines
ca n be classified under th e fo l lowi ng five systems : elect ri c power, gas and l iquid
fu els, te lecomm un icatio ns, transportation, and wate r supp ly and sewers.
The first ste p in protectin g lifelin e syst ems is th e prioritization of c rit ica l fa c ilities, utilit y
systems, and oth e r infrastructure. Th e invo lve me nt of state age ncies , such as t he Illinoi s
De pa rt ment of Tr anspo rtation, is im porta nt. Th e involvem ent of private ow ners of utility
syst ems is a lso i mpo rtan t. FEMA, through t he Natio na l Eart hquake Haza rd Re d ucti o n
Prog ram (NEHRP) and the Central United States Ea rthq uake Consortium offer tech nica l
gu i da nce on ret rofitting approaches.
5.3 Insurance
Technically spea kin g, in s ura nce does not mit iga t e d a mage ca used by a natural hazard .
Howeve r, it does hel p th e own e r repai r, reb uild a nd (ho pe f ully) affo rd t o inco rpo rate som e
of the oth er mitigation m eas ures i n the process.
Insurance has t he advantage that, as long as t he po li cy is in force, the property is
pro t ected and no huma n in t ervent ion is needed f or the measu re to work. A standa rd
homeowner's insu rance po l icy wi ll cover a property for the haza rds of tornado, wind, ha il ,
Pro pe rty Protection 5-8 20 18
Natural Hazard Mitigation Plan
and winter storms. Separate endorsements are usually needed for earth movement (e.g.,
earthquake) coverage, sump pump failure, and sanitary backup.
Flood Ins ura nce: Although most homeowner's insurance policies do not cover a property
for flood damage, an owner can i ns ure a bui ld i ng for damage by surface fl ooding t hrough
the Nationa l Flood Insurance Program. Flood insurance (FEMA, 2017i) coverage is
provided for buildings and their contents damaged by a "general condition of surface
flooding" in the area. Some people have purchased flood insurance because it was
required by the bank when they got a mortgage or home improvement loan. Usua l ly these
policies just cover the building's structure and not the contents. Renters can buy contents
coverage, even if the owner does not buy structural coverage on the building. There is
limited coverage for basements and the below grade floors of bi-levels and tri-levels .
Seve ral insurance compan ies have sump pump fa il ure or sewer backup coverage that
can be added to a homeowner's insurance policy. Each company has different amounts
of coverage, exclusions, deductibles, and arrangements. Most are riders that cost extra.
Most exclude damage from surface flooding that would be covered by a National Flood
Insurance policy.
Ea rthquake Insurance: Earthquakes are not covered under standard homeowners or
business insurance policies, but coverage is usually available for earthquake damage in
the form of an endorsement to a home or business insurance policy. Cars and other
vehic l es are covered for earthquake damage under t he comprehens ive part of t he a uto
insurance po licy. In DuPage County, property owners can obtain earthquake insurance.
Earthquake insurance provides coverage for your dwelling, for your personal property,
and for any additional living expenses. Coverage can incl ude costs for the following:
• Temporary rental home, apartment, or hotel room
• Restaurant meals
• Telephone or utility installation in a temporary residence
• Relocation and storage
• Fu rn iture Renta l
• Laundry
Local I mplementation: Larger local governments can self-insure and often absorb the
cost of damages to one facility, but if many facilities are exposed to damage by one
event, self-insurance can be a major drain on the community. Many communities in
DuPage County are part of an Intergovernmental Risk Management Agency (IRMA), a
member-owned pub l ic risk poo l of governmental units located in northeastern Illinois, or
are part of the Illinois Municipal League Risk Management Association (IMLRMA).
Commu n ities shou ld not re ly on federa l disaster assistance t o make up the difference.
The Stafford Act, Section 406(d), as amended, states:
"(1) Reduction of Federal Assistance -If a public facility or private nonprofit facility
located in a special flood hazard area identified for more than 1 year by the
Administrator pursuant to the National Flood Insurance Act of 1968 (42 U.S.C . 4001
Property Protection 5-9 2018
Natural Hazard Mitigation Plan
et seq.) is damaged or destroyed, after the 180th day following November 23, 1988,
by flooding in a major disaster and such facility is not covered on the date of such
flooding by flood insurance, the Federal ass istance which would otherwise be
available under this section with respect to repair, restoration , reconstruction, and
rep lacement of such fac il ity and associated expenses sha ll be reduced i n accordance
with paragraph (2).
(2) Amount of Reduction -The amount of a reduction in Federal assistance under this
section with respect to a facility shall be the lesser of -
(A) the value of such facility on the date of the flood damage or destruction, or
(B) the maximum amount of insurance proceeds which would have been payable
with respect to such facility if such facility had been covered by flood insurance
under the National Flood Insurance Act of 1968 on such date"
(FE M A, 2016, P. 35).
In other words, the law expects public agencies to be fully insured as a condition of
receiving Federal disaster assistance.
5.4 The Gove r nment's Role
Property protection measures are usually considered the responsibi lity of the property
owner . However, loca l governments should be involved in all strategies that can reduce
flood losses, especia ll y acquisiti on and convers ion of a s ite t o public open space. There
are various ro les the County or a municipa l ity can play in encouraging and supporting
implementation of these measures.
Gove rnm ent Facilities: One of the first duties of a local government is to protect its own
facilit i es . Fire stations, water treatment plants and other critical facilities should be a high
priority for retrofitting projects and insurance coverage .
Often public agencies discover after the disaster that thei r "all -hazard" insurance po l icies
do not cove r the property fo r t he type of damage in c u rred . Fl ood in surance is eve n more
important as a mitigation measure because of the Stafford Act provisions discussed
above.
Public Information : Providing basic information to property owners is the first step in
supporting property protection measures. Owners need genera l information on what can
be done . They need to see examples, preferably from nearby.
Financia l Assistance: Communities can hel p owners by helping to pay for a retrofitting
project. Fi na ncia l assistance can range from fu ll funding of a project to he l ping reside nts
find money from other programs. Some communities assume responsibility for sewer
backups, street flooding, and other problems that arise from an inadequate public sewer
or public drainage system.
Less expensive comm un ity programs include low i nterest loans, forgivable low interest
loans and rebates. A forgivable loan is one that does not need to be repaid if the~owner
Property Protection 5-10 2018
Natural Hazard Mitigation Plan
does not sell the house for a specified period, such as five years. These approaches don't
fully fund the project but they cost the community treasury less and they increase the
owner's commitment to the flood protection project. Often, small amounts of money act
as a catalyst to pique the owner's interest to get a self-protection project moving.
The City of Guthrie, Oklahoma has a rebate program for installation of tornado shelters
and safe rooms. The City provides up to $1,500 per house, which can cover the majority
of the cost.
The more common outside funding sources are listed below. The last three are only
available after a disaster, not before, when damage could be prevented. Following past
disaster declarations, FEMA, the Illinois Emergency Management Agency (IEMA) and the
Illinois Department of Natural Resources have provided advice on how to qualify and
apply for these funds.
Pre-disaster funding sources
• FEMA's Pre-Disaster Mitigation (PDM) grants (administered by IEMA)
• FEMA's Flood Mitigation Assistance (FMA) grants (administered by IEMA)
• Community Development Block Grant (administered by the Department of
Commerce and Economic Opportunity
• Illinois Department of Natural Resources
• Conservation organizations, such as the Conservation Foundation and
Cortlands, although generally these organizations typically purchase vacant
land in natural areas, not properties with buildings on them.
Post-disaster funding sources
• Insurance claims
• The National Flood Insurance Program's Increased Cost of Compliance
provision (which increases the claim payment to cover a flood protection
project required by code as a condition to rebuild the flooded building)
Post-disaster funding sources, Federal disaster declaration needed
• FEMA's Public Assistance Program (FEMA, 2017j) (for public properties,
however, after a flood, the amount of assistance will be reduced by the
amount of flood insurance that the public agency should be carrying on the
property) (administered by IEMA)
• Small Business Administration disaster loans (for non-governmental
properties) (U.S. Small Business Administration, 2017)
• FEMA's Hazard Mitigation Grant Program (administered by IEMA) (FEMA,
2017k)
Acquisition Agent: The community can be the focal point in an acquisition project. Most
funding programs require a local public agency to sponsor the project. The County or a
municipality could process the funding application, work with the owners, and provide
some, or all, of the local share.
Property Protection 5-11 2018
Natural Hazard Mitigation Plan
Mandates: Mandates are considered a last resort if information and incentives aren't
enough to convince a property owner to take protective actions. An example of a
retrofitting mandate is the requirement that many communities have that downspouts be
disconnected from the sanitary sewer line.
There is a local mandate for improvements or repairs made to a building in the regulatory
f loodp lain. If the project equa ls or exceeds 50 percent of the value of the original
building it is considered a "substantial improvement". The building must then be elevated
or otherwise brought up to current flood protection codes .
Another possible mandate is to requ ire less expensive hazard protection steps as a
condition of a building permit. For examp le, many communities require upgraded
electrical service as a condition of a home improvement project. If a person were to apply
for a permit for electrical work, the community could require that the service box be
moved above the base flood elevation or the in stallation of separate ground fault
i nterrupter circuits in the basement.
5.5 Repetitive Flood Loss Properties
Chapter 2 explains the criteria for designation of the County's repetitive loss properties.
Repetitive loss properties deserve special attention because they are more prone to
damage by natural hazards than any other properties in the County. Further, protecting
repetitive loss buildings is a priority with FEMA and IEMA mitigation funding programs.
When repetitive loss properties are reviewed, the key factors listed below shou ld be used
to determine appropriate property protection measures. The criteria used are based on
severa l stud ies that have identified appropriate measures based on flood and building
conditions. While a cost/benefit study was not conducted on each property, these
guidelines show which measures are cost-effective.
• "High hazard areas" are areas in the floodway or where the 100-year flood is two
or more feet over the first floor.
• Buildings in high hazard areas or in less than good condition should be acquired
and demolished.
• Buildings with basements and split-level foundations in high hazard areas should
be acquired and demolished. They are too difficult to elevate and the hydrostatic
pressures on the walls from deeper flooding make them too risky to protect in
place.
• Buildings subject to shallow flooding from loca l drainage should be protected
through area-wide flood contro l or sewer imp rovement projects.
• Buildings in good condition on crawlspaces should be elevated or relocated.
• Buildings in good condition on slab, basement or split-level foundations subject to
shallow flooding (less than 2 feet) can be protected by barriers and dry
flood proofing.
• Recent flood claims. Some properties have not had a flood insurance claim for 20
years, indicating that some measure has probably been put in place to protect the
property from repetitive flooding.
Property Protection 5-12 2018
Natural Hazard Mitigation Plan
Th ese criteria are general, and recommendations for indiv idua l structures should be
made on ly after a site inspection. Other extenuating circumstances may also alter the
recommendations.
The DuPage County 'Repet itive Loss Areas', shown in Exhibit 5-6, summarizes FEMA
repetitive loss properties in DuPage County. DuPage County maintains a li st of all flood
prone properties that qualify for acquisition, and the list includ es repetitive loss
properties. Properties have been identified for acquisition throughout DuPage County
based on watershed modeling done by the County. The properties are identified by
watershed (or sub-watershed) utilizing a Benefit Cost Analysis (BCA) Model that predicts
frequencies and damages of structures within a flood prone area rather than "repetitive
loss areas." Funding of acquis ition s, or matching funds, is/are provided through County
stormwater management program and supplemented by FEMA/IEMA/IDNR/HUD grant
funds. The acquisition list also includes all properties that have been acquired by local,
state and federal agenc ies (see Table 5-1).
The effort of the Countywide Stormwater Management Program has greatly reduced the
number of repetitive loss properties in DuPage County. Municipalities and DuPage County
are continuing repetitive loss acquisition efforts as grant dollars and matching funds
become available.
Table 5-3 explains the source of water, cause and depth of flooding, and the velocity of
flood waters for each area shown within Exhibit 5-6. Table 5-4 explains the total number
of structures shown within each area of Exhibit 5-6. Out of these locations, a total of 14
properties are considered severe repetitive loss properties. For confidentiality reasons,
the location s of these properties and the types of structures are not disclosed. The
defin itio n of severe repetitive loss can be found within Chapter 2.
Property Protection 5-13 2018
Natural Hazard Mitigation Plan
Table 5-3
Repetitive Loss Areas: Source of Water, Cause, Depth of Flooding, and Velocity
Rep Mean
Peak Discharqe (CFS) Velocity 100yr Source Cause Approx.
L oss e levati on Depth
Area 10yr 50vr 100vr 500yr (FPS)
A 202 346 429 693 2.2 669.2 Willow Creek Trib to Salt Overbank 0-6"
B .. ·-------664.5 Depressional Floodino/Site Specific Oepressional 0-6"
c 197 296 370 445 2.2 734.8 Upper SprinQ Brook Trib to Salt Creek Overbank 0-6"
D 642 1040 1264 1800 1.9 683.1 Lower Spri nq Brook Conf Salt Creek Overbank 0-12"
E 2110 3090 3502 4490 1.3 678.2 Lower Salt Creek Ma i n Stem 1 Over bank 6-12"
F 115 195 235 328 1.1 704.4 Upper Sprino Brook 2 Tri b to Salt Creek Overbank 0-6"
G 62 135 180 296 0.4 701.8 W estwood Creek Trib 1 to Salt Creek Overbank 0-6"
H 171 282 323 438 0.6 676.2 Westwood Creek Trib 2 to Salt Creek Overbank 0-6"
I 2267 3350 3857 5240 1 675.5 Lower Salt Creek Main Stem Overbank 0-12"
J 570 780 850 1000 1.3 687.4 SuQar Creek Trib to Salt Creek Overbank 6-12"
K 2162 3258 3665 4427 2.5 661.1 Lower Salt Creek Main Stem 2 Overbank 12"+
L 225 350 384 451 1.7 691.1 Bronzewood Creek Trib to Salt Overbank 0-6"
M 1420 2300 2720 3850 3 691.8 Flaaa Creek Trib to Des Plaines River Overbank 0-6"
N 294 476 566 800 2.1 694.6 Sawmill Creek Over bank 0-6"
0 885 1150 1435 1820 5.3 680.4 East Branch Main Stem 1 Oepressional 0-6"
p 140 235 305 605 2.3 737 .7 Armitage Creek Trib to East Branch Overbank 0-6"
Q 145 218 302 396 1.6 724.1 Tributary #2 East Branch Over bank 0-6"
R ----------707.2 Unnamed T ributary to East Branch Depressional 0-6"
s 455 730 870 1200 2.7 715.9 Glencrest Creek Trib to East Branch Overbank 0-6"
T 1810 2510 2900 3880 4.2 663.3 East Branch Main Stem 2 Overbank 0-12"
u 450 720 860 1180 1.6 698.5 Lacey Creek Trib to East Branch Over bank 0-6"
v 690 1090 1290 1770 2 .5 699.8 St Joseoh Trib 1 to East Branch Overbank 0-6"
w 145 195 230 320 1.9 719.5 St Joseoh Trib 3 to Eas t Branch Over bank 12"+
x 155 250 295 405 2.5 727.7 St Joseph Trib 2 to East Branch Overbank 0-6"
y 420 665 795 1100 1.4 722.7 Prentiss Creek Trib to East Brnach Overbank 0-6"
z ----------779.1 Trib #1 West Branch Depression al 0-6"
AA 445 592 655 947 2.4 748.4 Klein Creek Trib to West Branch Overbank 6-12"
BB .. ·------· 760.1 Deoressional FloodinafSite Soecific Deoressional 0-6"
cc 370 510 590 855 2.1 734 Winfield Creek Trib 1 to West Banch Overbank 0 -6"
DD 430 585 665 935 1.5 713.7 Winfield Creek Trib 2 to West Banch Overbank 12"+
EE 305 425 490 705 1.3 711.2 West Branch, SprinQBrook Trib Overbank 0-6"
FF 65 140 190 305 0.5 771.8 West Branch Main Stem Overbank 0-6"
GG 380 540 615 805 2.4 706 Ferrv Creek Tributarv to West Branch Overbank 0 -6"
HH 3075 4000 4400 5250 3.6 654.2 West Branch Main Stem 2 Overbank 0-6"
II -· --------708.1 Depressional Floodinq/Site Specific Depressional 0-6"
JJ 54 96 122 185 0.7 657.1 Addison Creek Tri b to Salt Creek Overbank 0-6"
Property Protection 5-14 2018
N atural Hazard Mitigation Pl an
Ta bl e 5-4
Re pet iti ve Loss Areas: Land Use Types and Tota l Prop e rt ies
Land Use Type
Rep Loss Single-Family Multi-Family Total Number
Area Residential Residential Industrial Commercial Institutional of Properties
A --9 --9
B 2 ----2
c 2 ----2
D 4 -1 --5
E 8 ----8
F 1 ----1
G 2 ----2
H 6 3 -1 10
I 14 7 -2 -23
J 5 -- - -
5
K 26 1 -3 -30
L 3 ----3
M 2 -- - -
2
N 2 ----2
0 1 1 ---2
p 4 ----4
Q 1 --1 -2
R 3 ----3
s 8 ----8
T 24 ----24
u 3 -- --3
v 1 1 ---2
w 4 ----4
x 5 1 - --6
y 2 ----2
z 1 - ---1
AA 21 ----21
BB 2 ----2
cc 3 --1 -4
DD 7 ----7
EE 12 1 -1 -14
FF 3 - ---3
GG 1 ----1
H H 3 - --1 4
II 1 ----1
J J 9 ---1 10
Property Pr otection 5-15 20 18
The County ol OuPag•
Stormw1tff M'1Mlgtn'.t11t
421 N. Ccxinty Fann Rd
WhHton. IL 60187
JanwJY 2018
Property Protection
Natural Hazard Mitigation Plan
Exhibit 5-6
DuPage County Repetitive Loss Ar eas
DuPage County Repetitive Loss Areas
1 in=2 miles
0 0.5 I 2 MIH
I 1 1 I I I I I I
N
w~'f.-E
s
5-16
Repelitive Loss Areas
C3 Watershed Boundaries
CJ Township Boundaries
-Floodway
Zone A
-ZoneAf:.
2018
Natural Hazard Mitigation Plan
5.6 Conclusions
1. Property protection measures for natural ha zards are important for DuPage County
given the number of hazards and the number of buildings for which the County is at
risk.
2. Th ere are several ways to protect individua l properties from damage by natural
hazards. The advantages and disadvantages of each should be examined for each
situation.
3. Property owners can implement some property protection measures at little cost,
especially for sites in areas of low hazards (e.g., shallow flooding, sewer backup,
summer, and winter storms).
4. For other measures, suc h as relocation, elevation and safe rooms, the owners may
need financial assistance.
5. Limited and inaccurate data from FEMA makes it difficult to assess repetitive flood
loss properties.
6. Government agencies can promote and support property protection measures
through activities ranging from financial incentives to public information .
7. The County is unable to determine if government properties, including critical
facilities, have measures to protect them from flood ing, tornadoes, and other natural
hazards.
8. About 2,200 of the buildings in the County's floodp lains are covered by flood
insurance.
5. 7 Recommendations
1. Available property protection public education material s shou ld be consolidated and
tailored for DuPage County. Materials should address measu res that can help owners
reduce their exposure to damage by natural hazards and the various types of
in surance coverage that are available.
2. The County and municipalities should provide information and technical advice to
floodplain property owners for reading floodplain maps.
3. The County and municipalities should consider the feasibility of providing information
and technical advice to floodplain property owners for protecting their property.
4. Repetitive flood loss areas should be investigated and mitigated.
5. Most property protection projects should be voluntary.
Property Protection 5-17 2018
Natural Hazard Mitigation Plan
6 . Structural elevation or acquisition alternatives should be investigated for flood prone
prope rti es when a regional project is not feasible.
7. Feasible structural elevation or acquisitions should be funded through grants or
through capital funding.
8. Positive incentives should be maintained and created by the County and
municipalities to encourage property protection by property owners.
9. Communities should consider cost-sharing programs, such as rebates, to encourage
low cost property protection.
10.All property owners should be encouraged to determine if they are adequately insured
for natural hazards.
11. DuPage County should seek property protection financial assistance for flood and
tornado mitigation projects for properties at risk.
12.A standard checklist should be developed to evaluate a property's exposure to
damage from the hazards most prevalent in DuPage County. The checklist should be
provid ed to each agency participating in this planning process and made available to
the general public.
13.Each public entity should evaluate its own properties using the standard checklist. A
priority should be placed on determining critical facilities' vulnerability to damage and
whether public properties are adequately insu red.
14.Each public entity should protect its own publicly-owned facilities with appropriate
mitigation measure(s), except where efficiencies allow for joint fu ndi ng and joint
projects.
15.All critical facilities in the floodplain, with priority given to facilities in the floodway,
should be mitigated, to the extent that the measures are cost effective and feasible.
Property Protection 5-18 2018
Natural Hazard Mitigation Plan
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Property Protection 5-19 2018
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https://www.fema.gov/hazard-mitigation-grant-program
U.S. Small Business Administration. (2017). Small business Loans. Retrieved on:
December 26, 2017. Retrieved from: https://www.sba.gov/funding-
programs/loans
Village of South Holland, Illinoi s. (2017). Basement Protection Berm. Retrieved on:
December 26, 2017. Retrieved from:
http://www.so uth h ol land .org/ departments/flood-ass istance/flood-
protection/ basements/
Property Protection 5-20 2018
Natural Hazards Mitigation Plan
Chapter 6 -Structural Projects
Structural projects are projects that are constructed to protect people and infrastructure
from damage due to natural hazards. Structural projects are usually funded by public
agencies. Structural projects keep flood waters away from an area by constructing
barriers, storing floodwater elsewhere, or by redirecting flood flows. Large structural flood
control projects are most often planned, funded and implemented at a regional level by
agencies, such as DuPage County Stormwater Management the Illinois Department of
Natural Resources (IDNR), Office of Water Resources, the U.S. Army Corps of Engineers,
the U.S. Department of Agriculture's Natural Resources Conservation Service. Many
projects are jointly planned and funded between these agencies in cooperation with the
municipalities or the DuPage County Forest Preserve District. Six approaches are
reviewed in this chapter (FEMA, 2017, P. 418):
• Reservoirs
• Levees
• Floodwalls
• Diversions
• Channel modifications
• Storm drain improvements
The DuPage County Stormwater Management Plan was adopted in 1989. This Plan
consolidated the existing stormwater effort throughout the County into a "unified,
countywide structure" (DuPage County, 1989, P. 5). The Plan was adopted in accordance
with Illinois Public Act 85-905 which gives DuPage County to authority to conduct
planning, adopt regulations and implement projects, including structural projects, relating
to stormwater management.
The planning of structural flood control projects usually involves an alternative
assessment, and that assessment is typically part of, or a product of, a watershed plan.
Watershed plans, flood control studies, and reports published for DuPage County
communities can be found within Table 6-1. Along with the survey of DuPage County
communities, these plans and projects implemented by the DuPage County Stormwater
Division form the basis of this chapter.
6.1 Reservoirs and Detention
Reservoirs reduce flooding by temporarily storing flood waters behind dams or in storage
or detention basins. Reservoirs lower the flood height by holding back, or detaining,
runoff before it can flow downstream. Flood waters are detained until the flooding has
subsided, then the water in the reservoir or detention basin is released or pumped out
slowly at a rate that the river can accommodate downstream. Reservoirs can be dry and
remain idle until a large rain event occurs. Or they may be designed so that a lake or
pond is created (FEMA, 2015, P. 2). Reservoirs are most commonly built for one of two
purposes. Large reservoirs are constructed to protect property from existing flood
problems. Smaller reservoirs or detention basins are built to protect property from the
impacts of new development (i.e., more runoff) (FEMA, 2015, P. 1).
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Table 6-1
DuPage County Publications
1988 Adopted Willow Way Brook Watershed Plan
1991 Adopted Ginger Creek Watershed Plan
1991 Adopted Salt Creek Watershed Plan
1991 Adopted Willow Creek Watershed Plan
1992 Adopted Salt Creek Watershed Capital Improvement Plan
1992 Adopted Tributary #4 Watershed Plan
1994 Adopted Black Partridge Watershed Plan
1994 Adopted Winfield Creek Watershed Plan
1994 Adopted Westwood Creek Watershed Plan
1994 Adopted Klein Creek Watershed Plan
1996 Adopted Valley View Flood Control Plan
1996 Adopted Sawmill Creek Watershed Plan
1996 Adopted Tributary #2 Watershed Plan
1997 Adopted Flagg Creek Watershed Plan
1997 Adopted Steeple Run Watershed Plan
1998 Adopted the Sawmill Creek Watershed Plan Addendum
1999 Amended the Salt Creek Watershed Plan
1999 Adopted Ferry Creek Watershed Plan
2002 Adopted West Branch Tributary #1 Watershed Plan (Keeneyville)
2003 Adopted Addison Creek Watershed Plan
2004 Adopted the River-Dumoulin Flood Contro l Plan for inclusion in the
East Branch DuPage River Watershed Plan
2004 Adoption of Route 53 North Flood Control Plan for inclusion in the
East Branch DuPage River Watershed Plan
2004 Adopted the Upper Des Plaines River Tributari es Watershed Plan
2006 Adopted West Branch DuPage River Watershed Plan
2006 Adopted Spring Brook Tribu tary to Sa lt Creek Watershed Plan
2010 Adopted West Branch DuPage River Interim Watershed Plan Addendum
2010 Adopted Klein Creek Watershed Plan Addendum No 2
Regardless of size, reservoirs protect the development that is downstream from the
reservoir site. Unlike levees and channel modifications, they do not have be bui lt close to
or disrupt the area to be protected (FEMA, 2015, P. 2).
There are severa l considerations when evaluating use of reservoirs and detention (FEMA,
2013a, P. 16):
• The expense for management and maintenance of the facility.
• Flooding can still occur if their design leve l is exceeded .
• Sediment deposition may occur and reduce the storage capacity over time.
• They can impact water quality as they are known to affect temperature, dissolve
oxygen and nitrogen, and nutrients.
In u rban areas such as DuPage County, reservoirs are an important part of floodwater
management. Table 6-2 shows reservoirs that have been constructed. Significant
detention has been provided in the Salt Creek watershed to address the damage that
occurred from the 1987 flood. Examination of detention opportunities is a part of
watershed planning for DuPage County. Also, the DuPage County Countywide Stormwater
and Flood Plain Ordinance require stormwater detention with most new developments.
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Natural Hazards Mitigation Plan
Table 6-2
DuPage County Detention Projects -Constructed
Watershed Project Storage Year Maintenance (Acre-Feet) Completed
Salt Creek Elmhurst Quarry Reservoir 8,300 1996* DuPage County
Salt Creek Wood Dale • Itasca Reservoir 1,775 2003* DuPage County
Salt Creek Meacham Grove Reservoir 600 1997* DuPage County
Salt Creek Lake-Villa Reservoir (Louis Reservoir) 210 1994* Addison
Wayne Oaks Dam 70 1995*
East Branch DuPage Willoway Brook Reservoir 345 1990* DuPage FPO River
West Branch DuPage Upper DuPage Reservoir 230 1977 River
West Branch DuPage Winfield Creek 110 1997* River
West Branch DuPage Gary/Kehoe Reservoir 140 1999* DuPage County River/Klein Creek
Cricket Creek Wetland Bank 1 1996*
Steeple Run Drainage Improvement. 30 2000*
Sawmill Creek Marion Hills Dale Basin 14 2002*
Sawmill Creek Marion Hills Crest Road Basin 34 2004*
Eldridge Park Reservoir Modification 120 2002*
Huffman Street Flood Control Project -Phase I 13.5 2006*
Kress Creek Regional Flood Control facility 200 2006*
East Branch 8th and Cumnor 4.6 2009 Downers Grove
East Branch Washini:iton Park 9 2010 Downers Grove
East Branch 2nd and Cumnor 5.7 2011 Downers Grove
Brewster Creek Brewster Creek Flood Control Reservoir 50 2012 DuPage County
West Branch DuPage Armstrong Park Reservoirs 113 2015 DuPage County River/Klein Creek
Total Storage : 12,355.5
ac-ft
•constructed since the adoption of the 1989 DuPage County Countyw1de Stormwater Management Plan
Other detention projects that have been sponsored by DuPage municipalities include:
• Lufkin Reservoirs/Jackson Detention Area in Villa Park in the Sugar Creek
watershed (100-year design)
• Reservoir at Prospect/Coolidge in Wheaton (built in 1976) with pump station
• Twin Lakes Park Detention Area in Villa Park
• Terrace-Douglas Basin in Villa Park with a 100-year design
• Off-Track Betting Detention Basin in Villa Park with a 100-year design
• Prospect/Norfolk detention basin in Clarendon Hills (10-year design) built in 1989
• Schiller Street Basin in the Salt Creek watershed, built in 1987 in Itasca
• Meacham Creek Tributary 3 reservoir constructed in 2004 in Roselle, in the
Salt Creek watershed
• Lake Manor Pond in Addison (100-year design) in the Salt Creek watershed
• Plamondon-Mulloy Pond in Addison (100-year design) in the Salt Creek watershed
• Steeple Run watershed projects in Naperville (Old Plank Park and Huffman Street)
• Carol Stream Venture subdivision
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Natural Hazards Mitigation Plan
6.2 Levees and Barriers
This flood control measure is a barrier of earth (levee) or concrete (floodwall) erected
between the watercourse and the property to be protected. Levees and floodwalls confine
water to the stream channel by raising its banks. They must be designed to account for
large floods, underground seepage, pumping of internal drainage, erosion and scour.
Key considerations when evaluating the use of a levee include (FEMA, 2013b, P. 48):
• Removal of fill to compensate for the floodwater storage that will be displaced by
the levee
• Internal drainage of surface flow from the area inside the levee.
• Cost of construction and maintenance
• Design limitations (while levees may reduce flood damage for smaller more
frequent rain events, they may overtop or breach in extreme flood events and
create more flood damage than would have occurred without the levee).
Levees can push floodwater onto other properties upstream or downstream and need to
be designed with this in mind. To reduce environmental impacts and provide multiple use
benefits, a setback levee (set back from the floodway) is the best project design. The area
inside a setback levee can provide open space for recreational purposes and provide
access sites to the river or stream (FEMA, 2013b, P. 49).
Floodwalls perform like levees except they are vertical-sided structures that require less
surface area for construction. Floodwalls are constructed of reinforced concrete, which
makes the expense of installation cost prohibitive in many circumstances. Floodwalls also
degrade adjacent habitat and can displace erosive energy to unprotected areas of
shoreline downstream (FEMA, 2013b, P. 2). Levees and floodwalls are appropriate when
the cost of relocating structures out of the flood prone area exceeds that cost of the levee
or floodwall construction and maintenance, and when upstream and downstream
impacts can be mitigated (FEMA, 2013b, P. 54). Constructed levees in DuPage County
are shown in Table 6-3.
Table 6-3
DuPage County Levee and Barrier Projects -Constructed
Watershed Project Year Maintenance Completed
Salt Creek Addison Dam and Pump (Westwood Creek 1995 Addison backflow prevention)
Salt Creek Kingery West Levee (east side of Salt Creek) 1982 DuPage County
Salt Creek Elmhurst Levee 1991 DuPage County
East Branch DuPage River East Branch DuPage River and St. Joseph 1968 DuPage County r.rPPk in I ;.,, lo (I "'""'"''
West Branch DuPage River Winfield Creek in Wheaton 1977 --
East Branch DuPage River Dumoulin Pump Stations 2008 DuPage County
West Branch DuPage River River Road Levee 2016 DuPage County
Salt Creek Graue Mill Levee 2017 Hinsdale
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Natural Hazards Mitigation Plan
In 1977, a levee was constructed to protect homes in the Winfield Creek watershed in
Wheaton (100-year design}. A portion of the levee eroded during the 1987 flood. The
levee was repaired. The Elmhurst levee was constructed in 1991 to protect homes from
Sa l t Creek flooding (100-year design}. The levee was constructed as the Elmhurst Quarry
reservoir was being designed to provide storage of floodwaters. In Villa Park a berm was
constructed at Rotary Park in the Salt Creek watershed (50-year design}. In the 1960s,
channel improvements were made and levees constructed along the East Branch of the
DuPage River (from Middleton Avenue to Maple Avenue) and St. Joseph Creek (from
confluence with the East Branch DuPage River to Illinois State Route 53) in Lisle. As part
of the River Dumoulin Flood Control Study, the County has proposed repair of the Lisle
levees. However, easements from private property owners fo r this work have been
difficult to obtain and the repairs have not been completed as a result.
DuPage County Stormwater Management oversaw th e design and construction of the
Bower School berm enhancement project to protect the school from flooding from the
adjacent West Branch DuPage River. The improvement to the school's existing berm
follows a flood in 2008 that caused the school to close for a week. The project removed
the school from the high-risk flood zone and protected the school in the April 2013 f lood
event. Following th is project, a berm was constructed along River Road -upstream from
t he school -which protected approximately 60 additiona l structures. This was completed
in 2016.
The West Branch DuPage River Flood Control and Re-meander Project was t he final
phase of work to address the flooding concerns along River Road in Warrenville. The
project was completed in October 2016. Improve ments included: the extension of a flood
control berm and multi-use path along River Road, creation of compensatory storage in
Leone Schmidt Heritage Park, realignment of the West Branch DuPage River, and
associated river restoration. The DuPage County Divi sion of Transportation reduced the
existing water surface elevations by the re-meander realignment of the river with the
replacement of the Warrenville Road bridge in 2015.
DuPage County in cooperation with the Village of Hinsdale, IDNR -OWR and IEMA have
been working on the multi-phase Graue Mill Levee project which will provide enhanced
protection for its residents. This project is undergoing t he final phase of work necessary
which includes floodwalls, berms and pump stations. The anticipated final project
completion is M ay 2018.
6.3 Channel Improvements and Diversions
By improv ing channel's conveyance, more water is carried away at a faster rate. Three
types of channel improvements are reviewed here: projects that make th e channel wider,
straighter or smoother; dredging the channel bottom; and diversion of high flows to
another channel or body of water.
Straightening, deepening and/or widening a stream or river channe l, commonly referred
to as "channelization" (Encyclopedia, 2016), which is commonly used for local drainage
Structural Projects 6-5 2018
Natural Hazards Mitigation Plan
or flooding problems. In DuPage County, detention projects are usually considered with
channel improvements.
Dredging for the purpose of floodwater management is often viewed as a form of
conveyance improvement. However, it has the following limitations (Environmental
Protection Agency, 1998):
• Dredging is often cost prohibitive because the dredged material must be disposed
of somewhere else (out of the floodplain).
• Unless instream and/or tributary erosion are corrected upstream, the dredged
areas usually fill back in within a few years.
• If the channel has not been disturbed for many years, dredging will destroy the
habitat that has developed.
• To protect the natural values of the stream, federal law requires a Corps of
Engineers permit before dredging can proceed. This can be a lengthy process that
requires much advance planning and many safeguards to protect habitat.
A diversion is a new channel that sends floodwaters to a different location, thereby
reducing flooding along an existing watercourse. Diversions can be surface channels,
overflow weirs, or tunnels. During normal flows, the water stays in the old channel. During
flood flows, the floodwaters spill over to the diversion channel or tunnel, which carries the
excess water to a receiving lake or river. Diversions are limited by topography; they will
not work in some areas. Unless the receiving water body is relatively close to the flood
prone stream and the land in between is low and vacant, the cost of creating a diversion
can be prohibitive (Environmental Protection Agency, 1999).
The channel enlargement on Willoway Brook in the East Branch DuPage River watershed
(100-year design) constructed in 1990 in Wheaton performed well during the 1996 flood.
DuPage County channel improvement projects are included in Table 6-4.
Table 6-4
DuPage County Channel Improvement Projects -Constructed
Watershed Project Year Maintenance Completed
Salt Creek Salt Creek Channel Improvement 1992 Oak Brook,
Elmhurst
Salt Creek Bensenville Ditch 1998 Bensenville
East Branch DuPage River St. Joseph Creek Channel 1990 Downers Grove Improvement
East Branch DuPage River Willoway Brook 1990 Wheaton
West Branch DuPage River West Branch DuPage River Channel 1992 Hanover Park Improvement
West Branch DuPage River Long Meadow Road Channel 1981 Hanover Park Improvement
West Branch DuPage River West Branch DuPage River 2015 Property
Improvements (10 mile project) Owners
East Branch DuPage River Lacey Creek Streambank Stabilization 2017 Downers Grove
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Natural H azards Mitigation Plan
6.4 Crossings and Roadways
In some cases buildings may be eleva ted above floodwaters but access to the building is
lost when floodwaters overtop local roadways, driveways, and culverts or ditches.
Depending on the recurrence interval between floods, the availab ility of alternative
access, and the level of need for access, it may be economically justifiable to elevate
some roadways and improve crossing points.
For example, if there is sufficient downstream channel capaci ty, a small culvert that
constricts flow and causes localized backwater flooding may be replaced w ith a larger
culvert to eliminate flooding at the waterway crossing point. The potential for worsening
adjacent or downstream flooding needs to be considered before implementing any
crossing or roadway drainage improvements.
The bridges shown in Table 6-5 have been iden tified by DuPage County communities as
t hose which impede or obstruct flow . Th e roadways included in the table are those that
could be elevated to provide continued access during flooding.
Table 6-5
DuPage County B ri dges and Roadways that Impede Flood Flows
Community Bridge or Roadway
Village of Downers Grove Highland Avenue
Vi llage of Downers Grove 55th Street and Grand Avenue
Village of Downers Grove Fairview Avenue and Maple Avenue Creek, East
Branch
Village of Downers Grove Fairview Avenue and 56th
Village of Itasca Maple Street Bridge
Village of Itasca Irving Park Road Bridge
Village of Itasca Elm Street (private bridge to Itasca Country Club)
Village of Itasca North Prospect Avenue
Village of Lisle Burlington Northern railroad culvert at south end of
Elm Street
Village of Roselle Foster Avenue Bridge (Improvement proposed)
Village of Villa Park Possibly St. Charles Road at Salt Creek
Village of Villa Park Possibly Villa Avenue at Sugar Creek
City of Wheaton 1700 Block of North Main Street
City of Wheaton Bridge at Marianjoy Rehabilitation Hospital
Village of Winfield Winfield Road at Winfield Creek (aka Spring Brook)
Village of Winfield Pa rk Street at Winfield Creek
Village of Winfield Church Street at Winfield Creek
Village of Winfield Summit Drive at Winfield Creek
Village of Winfield East Street at Winfield Creek
V illag e of Winfield Manchester Road at Winfield Creek
Village of Winfield Roosevelt & Shaffner Roads at Winfield C reek
City of Wood Dale Irving Park Road at Salt C re ek (in design)
Structural Projects 6-7 2018
Natural Hazards Mitigation Plan
6.5 Drainage and Storm Sewer Improvements
Manmade ditches and storm sewers he lp drain areas where the surface drainage system
is inadequate, or where underground drainageways may be safer or more practical. Storm
sewer improvements include installing new sewers, enlarging small pipes, and preventing
back flows. Particularly appropriate for depressions and low spots that will not drain
naturally, drainage and storm sewer improvements usually are designed to carry the
runoff from smaller, more frequent storms.
The DuPage County Department of Public Works administers and manages the
Residential Drainage Assistance Program (RDAP). The objective of this program is to
assist County residents in correcting drainage concerns within unincorporated areas. The
department can offer technical support and/or guidance to residents if a drainage
concern does not qualify for construction improvements.
Many contributing factors can result in standing water on your property, ranging from the
type of soils to topographical information. Some properties simply take longe r to drain
than others. Improvements projects are only recommended for small local problems
where the receiving stream or river has sufficient capacity to handle the additional
volume and flow of water. To reduce the cumulative downstream flood impacts of
numerous small drainage projects, additional detention or run-off reduction practices
should be provided in conjunction with the drainage system improvements.
A com bi nation of restored wetland detention, vegetated swales, infiltration trenches and
other best management practices that increase infiltration (reducing runoff), and improve
water quality can be implemented in conjunction with stormwater system imp rovements.
Most DuPage County communities include storm sewer and drainage im provements
annually in their capital budgets. Many communities have also implem ented projects to
address areas with combined sewers.
Drainage System Maintenance: The drainage system may include detention ponds,
stream channels, swales, ditches and culverts. Drainage system maintenance is an
ongoing program to clean out blockages caused by an accumulation of sediment or
overgrowth of weedy, non -native vegetation or debris, and remediation of streambank
erosion sites.
"Debris" refers to a wide range of blockage materials that may includ e tree limbs and
branches that accumulate naturally, or large items of trash or lawn waste accidentally or
intentionally dumped into channels, drainage swales or detention basins (West's
Encyclopedia of American Law, 2005). Maintenance of detention ponds may also require
revegetation or repairs of the res trictor pipe, berm or overflow structure.
Maintenance activities normally do not alter the shape of the channel or pond, but they
do affect how well the drainage system can do its job. Sometimes it is difficult to
determine what separates debris that should be removed from natural material that
helps form habitat. Therefore, written procedures that are consistent with state laws and
Structural Projects 6-8 2018
Natural Hazards Mitigation Plan
environmenta l concerns are usually needed (Federal Emergency Management Agency,
2014).
Government agencies usually accept respons ibility for maintaining faci lities on public
property. However, in Illino is, the responsibility for drainageway ma i ntenance on private
property, when no easeme nts h ave been granted, is with the indi vidua l private property
owner. This often results in very l ittle maintenance being accomp lished. Table 6-6 shows
drainage system maintenance activity in DuPage Coun ty.
Table 6-6
DuPage County Drainage System Maintenance
Community Regular Drainage System Written Procedures Maintenance•
V ill age of Add ison Yes Unknown
City of Aurora Yes Unknown
Village of Bartlett Yes Unknown
Village of Bensenville Yes No
Village of Bloom ingdale Yes Unknown
Village of Burr Ridge Yes Unknown
Village of Carol Stream Yes Yes
Village of Cla rendon Hills Yes Unknown
City of Darien Yes Unknown
Village of Downers Grove Yes Unknown
City of Elmhurst Yes Unknown
Village of Glendale Heights Yes Yes
Village of Glen Ellyn Yes No
Village of Hanover Park Yes Unknown
Village of Hinsdale Yes Unknown
Village of Itasca Yes Unknown
Village of Lis le Yes Yes
Village of Lombard Yes Unknown
City of Naperville Yes No
Village of Oak Brook Yes No
City of Oakbrook T errace Yes Unknown
Village of Rose lle Yes Unknown
Village of Villa Park Yes Unknown
City of Warrenville Yes No
City of West Chicago Yes Unknown
V illage of Westmont Yes Unknown
City of Wheaton Yes Unknown
Village o f Willowbrook Yes Yes
Village of Winfield Yes Unknown
City of Wood Dale Yes Unknown
Village of Woodridge Yes Yes
DuPage County Yes --
•Based on information received for the 2017 Natural Hazard Mitigatio n Plan Annua l Report
Structural Projects 6-9 2018
Natural Hazards Mitigation Plan
6.6 DuPage County Planned Structural Projects
DuPage County Stormwater Management is continually conducting and identifying
structural mitigation projects. Table 6-7 lists the structural projects identified by the
DuPage County Stormwater Division t hrough the developed watershed plans. Table 6 -8
shows projects not yet funded.
Table 6-7
DuPage County Planned Stormwater Management Projects wi t h Identified Funding
Planned Project Estimated Cost Estimated Funding Source Completion Date
Kress Road -Union Pacific RR Culvert $1,850,000 Completed -2008 --
Kress Creek -Prairie Path , Western $800,000 Completed -2008 --
nriVA ;inrl nnwnc:; nr r'11lvi:>rt
Kress Creek -Airport Diversion $650,000 Completed -2012 --
Springbrook Creek Watershed Plan $450,000 Completed -2016 --
I mnlementation
Brewster Creek Flood Mitigation $5,200,000 Completed -2012 --
Klein Creek/Armstrong Park Flood $11,000,000 Completed -2015 --
Winfield Creek -Ma in Street $400,000 Completed -2013 --
West Branch/Warrenville Flood Mitiqation $5,500,000 Completed -2016 --
Busse Woods Dam Modification $1, 100,000 Completed -20 15 --
Spring Brook No.1 Watershed Plan $600,000 Completed -2016 --
River Dumoulin Levee Maintenance $70,000 In Prog ress -2018 --
Spring Creek Reservo ir Gate $950,000 In Progress -2018 DuPaqe Countv
Redmond Reservoir Expansion Project $3,000,000 In Progress -2018 HUD
Pearl Avenue Dra inaqe Project $100,000 In Progress -2018 DuPaqe County
Voluntarv Flood-Prone Buyouts $9,596,285 In Progress -2018 HUD , FEMA
Liberty Park Flood Control Project $3,000,000 In Proqress -2019 HUD
Table 6-8
DuPage County Planned Stormwater Management Projects Without Funding
Planned Project Location Estimated Cost
River Dumoulin Levee Flood Control Lisle $15,000,000
Valley View Storaqe Alternatives Glen Ellyn $6,500,000
St. Joseoh Creek Storaae Proiect Lisle/G len Ellyn $5,000,000
Hiah Ridqe Forest Preserve Storaqe Basin Lombard $1,800,000
Voluntary Flood-Prone Buyouts (27 Properties) Countywide $6 ,750,000
Lufkin Pond & Jackson Pond Expansions Villa Park $2,400,000
Winfield Creek Watershed Flood Control Winfield $3,150,000
Westmore-Meyers Culvert Replacement & Lombard $1,400,000
Arrowhead Subdivision Dra inaqe Pro ject Wheaton $300,000
Luther & Roosevelt Drainage & Flood Control Lombard $750 ,000
Nelson's Highview Drainage & Flood Control Glendale Heights $300,000
Woods & Geneva Drainaqe Project Winfield $300 ,000
Yorkfield DrainaQe & Flood Control Project Elmhurst $300 ,000
East of Main Street Drainaae Proiect G len Ellyn $250,000
Total: --$44,200 000
Structura l Projects 6-10 2018
Natural Hazards Mitigation Plan
Bensenville: In 2012, the Village of Bensenville completed a Storm Sewer Master Plan,
and further studied re commended master plan projects in 2014, incl uding for the
Addison Creek watershed. Table 6-9 outlines current projects within the Village that are
identified by unfunded. In addition, the Bensenvill e Ditch watershed is currently being
studied by an outside consultant, and two projects are currently un derway. The first,
Addison Creek -A lt 5 -George St. Bypass storm sewer improvements has an estimated
total cost of $1,670,000, and is projected to be complete in 2018. The second, Addison
Creek -S torage Alternative 2 -Redmond Reservoir partial expansion has an estimated
total cost of $2, 750,000, and is projected to be comp lete in 2018.
Table 6-9
Village of Bensenville Planned Projects Without Funding
Planned Project Estimated Cost
Bensenville Ditch-Area 81 -Center/Roosevelt -Storm sewer Improvements* $1,190,000
Bensenville Ditch-Area B2-Grove/Wood -Storm sewer Improvements* $360,000
Bensenville Ditch-Area 83-Church/Green-Storm sewer Improvements* $1,460,000
Bensenville Ditch-Area 84-Fenton HS-Basin/Storm sewer Improvements* $6,610,000
Bensenville Ditch-Area B5-IL83/Hillside/I L 19-Storm sewer Improvements• $5,950,000
Bensenville Ditch -Area B6-Glendale/Franzen -Storm sewer Improvements* $1,860,000
Addison Creek -Area A 1 -Wood/Addison/Evergreen-Storm Sewer Improvements # $13,779,000
Addison Creek -Area A2 -BelmonUDavid -Storm Sewer Improvements # $2,800 ,000
Addison Creek -Area A3 -Entry/Bernice-Storm Sewer Improvements # $1 ,100,000
Addison Creek -Area A4 -3rd Ave/Jefferson St-Storm Sewer Improvements# $4,000,000
Total $39 109,000
(*) 2012 Estimated Cost I (II) 2014 Estimat ed Cost
Downers Grove: The Village of Downers Grove has identified projects with funding (Table
6-10) and two projects without an an identified funding source. The first, Curtiss Avenue
stormwater improvements, has an estimated cost of $750,000 and a proposed
completion date of 2020.The second, Lee/Cornell/Stonewall stormwater improvements,
has an estimated cost of $650,000 and a proposed comp le t ion date of 2024.
Table 6-10
Village of Downers Grove Planned Projects with Funding
Planned Project Estimated Cost Estimated Completion Date
Chase/Fransisco Stormwater Improvements $800,000 Actual completion November 2017
Jefferson/Middauqh Stormwater lmorovements $600,000 Actual completion November 2017
Hitchcock Stormwater Improvements $500,000 In Progress -Summer 2018
Elm and Earlston Stormwater Improvements $500,000 In Progress -Summer 2018
Drendel Road Stormwater Improvements $750,000 In Progress -Summer 2018
Black Oak Stormwater Improvements $500,000 In Progress -Summer 2018
Deboll/Linden/Gierz Stormwater lmorovements $2,000,000 Spring/Summer 2019
F oresl/F ranklin/Prince/Prairie $300,000 In Progress -Summer 2018
Hobson Trianqle Stormwater Improvements $650,000 In Progress -Summer 2018
40th and Downers Stormwater l mProvments $1,000,000 Spring/Summer 2019
Deer Creek Floodolain Stormwater Improvements $2,000,000 2020
St. Joe's Creek Stormwater Improvements (Hummer Park} $3,000,000 2020
St. Joe's Creek Stormwater Improvements (El mwood/Maple} $1,000,000 2020
Structural Projects 6-11 2018
Natural Hazards Mitigation Plan
Villa Park: In 2015, the Village of Villa Park completed two flood studies, the Sugar Creek
Watershed Drainage Project and the Villa Park Comprehensive Flood Study, which
identified 17 projects to improve drainage in various areas of Villa Park. These 17
proposed projects are currently unfunded. Table 6-11 outlines the proposed estimated
cost for the entirety of each project.
Table 6-11
Village of Villa Park Planned Projects Without Funding
Planned Project Estimated Cost
Sugar Creek Watershed Drainage Improvement Project -Project alternative 1c $6, 744,000 .00
Sugar Creek Watershed Drainage Improvement Project -Project Alternative 2a $2 1,000.00
Sugar Creek Watershed Drainage Improvement Project -Project Alternative 3a, 3b, 3c $2,272,000.00
Sugar Creek Watershed Drainage Improvement Project -Project Alternative 4a $1,856,000 .00
Villa Park Comprehensive Flood Study -400 S Monterey Avenue $3, 792,000.00
Villa Park Comprehensive Flood Study -Washington Street Alt. #2 $9,372,000.00
Villa Park Comprehensive Flood Study -Astor Ct. and Myrtle Ave . $1,533,000.00
Villa Park Comprehensive Flood Study -Elm Street -#1 $4,368,000.00
Villa Park Comprehensive Flood Study -Summit Avenue $955,000.00
Villa Park Comprehensive Flood Study -Villa and Summit Avenues $2,051,000.00
Villa Park Comprehensive Flood Study -Twin Lakes $3,313,000.00
Villa Park Comprehensive Flood Study -Odeum $1,131,000.00
Villa Park Comprehensive Flood Study-Michigan Avenue $3,861,000.00
Villa Park Comprehensive Flood Study -Riordan Road $440,000.00
Villa Park Comprehensive Flood Study-Charles Avenue $1,692,000 .00
Villa Park Comprehensive Flood Study -Rotary Park $846,000.00
Villa Park Comprehensive Flood Study -Brer Rabbit Motel $1, 710,000.00
Total $45,957,000.00
Additionally, other projects that have been identified by DuPage County communities -
including those that are in progress, proposed with funding, and proposed without
funding -incl ude:
• A reservoir to alleviate flooding on Sugar Creek in Villa Park
• North Main Street at Winfield Creek is being studied by the City of Wheaton for
potential culvert and channel en largements
• Lake Ellyn Outlet Control Structure Improvements Project in Glen Ellyn
• Detention and floodplain improvements in the Town Center ~rea in Winfield
• Levee repair and restoration in Lisle; part of the River Dumoulin Flood Control
Study
• Klein Creek stream bank rehabilitation, which is a tributary to the West Branch of
the DuPage River
• Stormwater detention pond shore lin e stabilization efforts, with the consideration
of bio-engineering techniques and native, eros ion-resistant, plant material in Carol
Stream
• DuPage River Feasibility Study with the U.S. Army Corps of Engineers, DuPage
County Stormwater Management, and Lisle
• Indian Lakes Subdivision open space drainage improvements in Bloomingdale
Structural Projects 6-12 2018
Natural Hazards Mitigation Plan
• North Avenue Flood Alleviation Project in Glendale Heights
• Relocating the Route 53 Stormwater Pumping Station with a higher flow rate
capacity to reduce flooding in the northwest part of Lombard
• Gatz Pond Outfall Project and associated North Broadway Interim Pump Station
and Forced Main Project in Lombard
• Graue Mill Flood Protection Project, funded by a $2,5 76,4 75 grant through the
Hazard Mitigation Grant Program, in Hinsdale
6.8 Conclusions
1. The DuPage County Stormwater Management Program is important to DuPage County
and its municipalities. Proper funding of the program is necessary.
2. Structural projects, including reservoirs, channel improvements and levees, have been
effective in reducing flood damage in DuPage County, to the extent that they have been
tested.
3. It is understood that structural projects can have adverse impacts on downstream
properties and on the environment.
4. Structural measures should continue to be used in DuPage County to address flood
problems. It is understood new flood problem areas can be identified at any time; after
any flood event.
5. Structural projects can be effective in protecting critical facilities from natural hazards.
6. There are a number of locations where bridge or culvert replacement or enlargement
should be investigated.
7. Local drainage and stormwater flooding (both in and outside the floodplain) could be
reduced through drainage system improvements.
8. Drainage maintenance programs in communities are important throughout the
County.
6. 7 Recommendations
1. Structural flood control projects, including drainage and bridge and culvert
improvements, should be pursued and funded, provided they meet the following criteria:
• Each project's study looks beyond the immediate project site to ensure that no
other properties will be adversely impacted.
• Each project should be based on a watershed master plan or, at a minimum,
coordinated with other projects in the same watershed.
• Each project's study considers protecting the natural functions of the stream
and floodplain, in addition to flood protection.
• Each project's study considers alternative non-structural approaches to protect
the affected properties from flood damage.
Structural Projects 6-13 2018
Natural Hazarcls Mitigation Plan
• The design and construction is certified by a licensed professional engineer.
• Opportunities for stream and natural areas restoration are incorporated
wherever feasible.
• Communities and property owners that may be affected by the project are
notified.
• All relevant federal, state and local permits are obtained, including Corps of
Engineer's permits and IDNR floodway permits.
2. The DuPage County Stormwater Management program should continue to be funded
through appropriate funding mechanisms.
3. The DuPage County Stormwater Management program and municipalities should
continue to identify, plan and implement structural flood control projects both before and
following flood events.
4. Funding for municipal or regional structural measures in DuPage County should be
sought as it is made available through FEMA hazard mitigation programs.
5. Flood problem areas in DuPage County that should be considered for structural
mitigation are not limited to those identified in this Plan. Flood problems should be
addressed as they are identified.
6. Each municipality and the County should implement a formal and regular drainage
system maintenance program.
Structural Projects 6-14 2018
Natural Hazards Mitigation Plan
References
DuPage County, Illinois. (1989). DuPage County Stormwater management Plan. Retrieved
on: December 22, 2017.
Encyclopedia. (2016). 2016 Encyclopedia.com. Retrieved on: De cember 26, 2017.
Retrieved from: http://www.encycloped ia .com/ environment/ encyc lopedias-
a I ma na cs-transcripts-and-maps/stream-channelization
Environmental Protection Agency (EPA). (1998). Lake Dredging. Retrieved on: December
26, 2017. Retrieved from:http://www.epa.state.il.us/water/conservation/lake-
notes/la ke-dredgi ng. pdf
Environmental Protection Agency (EPA). (1999). Stormwater Technology Fact Sheet; Flow
Diversion. Retrieved on: December 26, 2017. Retrieved from:
https://nepis.epa.gov/Exe/ZyNET.exe/P1002YXA.TXT?ZyActionD=ZyDocument&CI
ient=EPA&lndex=1995+ Thru+1999&Docs=&Query=& Time =&EndTim e=&Search
Method=1& T ocRestrict=n& Toe=& TocEntry=&QField=&QFieldYea r=&OFieldMonth
=&QFie ldDay=&lntOF ie ld0p=O&ExtQFieldOp=O&Xm lQu ery=&Fi le=D%3A%5Czyf il es
%5C lndex%20Da ta%5C95thru99%5CTxt %5C00000023%5CP1002YXA.txt&User=
ANONYMOUS&Password=a nonymo us&SortMethod= h % 7C-
&Maxim um Documents= 1&F uzzyD egree=O&I ma geOual ity=r7 5g8/r7 5g8/x150y15
Og16/i425&Display=hpfr&DefSeekPage=x&SearchBack=ZyActionL&Back=ZyActio
nS&BackDesc=Results%20page&MaximumPages=1&ZyEntry=1&SeekPage=x&Zy
PURL
Federa l Emergecy Management Agency (FEMA). (2013a). Living with Dams, know your
risks. Retrieved on: December 22, 2017. Retrieved from:
https://www.fema.gov/media-library-data/20130726-1845-25045-
7939/fema p 956 living with dams.pdf
Federal Emergecy Management Agency (FEMA). (2013b). FEMA P-259 -Chapter SF.
Floodwalls and Levees. Retrieved on: December 22, 2017. Retrieved from:
https://www.fema.gov/media-library-data/20130726-1506-20490-
7 4 72/fema259 ch5f.pdf
Federal Emergency Management Agency (FEMA). (2014, May 1). Activity 540 -Drainage
System Maintenance. Retrieved on: December 7, 2017. Retrieved from:
https://www.fema.gov/media-library/assets/documents/84069
Federal Emergecy Management Agency (FEMA). (2015). Flood Diversion and Storage Fact
Sheet. Retrieved on: December 22, 2017. Retrieved from:
https://www.fema.gov/media-library-data/1487161066306-
be67 b 7 48dc934ff31ecbf849c6079e48/FDS Fact Sheet Feb2017 COMPLIANT.
pdf
Federa l Emergecy Management Agency (FEMA). (2017). National Flood lnsurnace
Program Community Rating System Coordinator's Manual. Retrieved on:
December 22, 2017. Retrieved from: https://www.fema.gov/media-library-
da~/1493905477815
West's Encyclopedia of American Law. (2005). Water Pollution. Retrieved on: December
26, 2017. Retrieved from: http://www.encyclopedia.com/science-and-
technology!biology-and-genetics/environmental-studies/water-pollution
Structural Projects 6-15 2018
Natural Hazard Mitigation Plan
Chapter 7 -Natural Resource Protection
Natural Resource Protection "activities preserve or restore natural areas or the natural
functions of floodplain and watershed areas" (FEMA, 2017, P. 510-20). Examples of
these activities include (FEMA, 2017, P. 510-20): .r
• Wetlands Protection
• Erosion and Sediment Control
• Natural Area Preservation
• Natural Area Restoration
• Water Quality Improvement
• Coastal Barrier Protection
• Environmental Corridors
• Natural Functions Protection
For information on erosion and sediment control, see Chapter 4.
7.1 Open Space Preservation
Keeping the floodplain and other hazardous areas open and free from development is the
best approach to preventing damage to new developments. Open space can be parks,
greenway corridors, and golf courses. Capital improvement plans and comprehensive
land use plans can identify areas to be preserved through any or all of the following
means:
• Acquisition,
• Dedication by developers,
• Dedicating or purchasing an easement to keep the land open,
• Specifying setbacks or buffer zones where development is not allowed, and
• Subdivision regulations need to ensure that streets and other public facilities can
handle emergency vehicles during an emergency.
"For over a century, the Forest Preserve District has been acquiring land in support of its
mission "to acquire and hold lands containing forests, prairies, wetlands and associated
plant communities or lands capable of being restored to such natural conditions for the
purpose of protecting and preserving the flora, fauna and scenic beauty for the
education, pleasure and recreation of its citizens" (Forest Preserve District of DuPage"
County, N.D.).
"To guarantee future residents the benefits of a healthy balance between urban
development and natural areas, [the Forest Preserve District Board] established a target
ratio of 25 acres of forest preserve land for every 1,000 residents" (Forest Preserve
District of DuPage County, N.D.). As of 2017, the Forest Preserve met that goal and
established a new goal of using tax dollars to both maintain and improve the existing land
under their care. Examples include, restoring native habitats, developing new trails, and
increasing the use of the land by County residents.
Natural Resource Protection 7-1 2018
Natural Hazard Mitigation Plan
7.2 W et la nd Protecti on
Wetlands often found in f loodplains and depressiona l areas of a watershed "genera lly
include swamps, bogs, marshes, wooded wetlands, ponds, streams, wet meadows and
simila r areas. "For regulatory purposes under the Clean Water Act, the term wetlands
means 'those areas that are i nundated or saturated by surface or ground water at a
frequency and duration sufficient to support, and that under normal ci rcumstances do
support, a prevalence of vegetation typically adapted for life in saturated soi l co nditions.
Wetlands genera lly include swamps, marshes, bogs and similar areas' [taken from the
EPA Regulations li sted at 40 CFR 230.3(t)]" (DuPage County, N.D .).
Three factors are used to determ i ne the presence of wetlands (according t o t he 1987
Army Corps of Engineers Delineation Manual):
1. "Hydric Soils-So i ls which present certain characteristics when saturated
2. Hydrophytic vegetation -Plants which grow in water or saturated so ils
3. Hydro logy-Soi ls sa t urated with water"
(DuPage County, N.D.)
Wetlands provide severa l natural benefit s, i nclud in g po ll utant remova l, f lood contro l,
groundwater regenera t ion, and a natura l habitat for plants a nd anima ls to live and grow
(DuPage County, N.D .). For additiona l i nformation on each of these natural benefits, see
Exhibit 7-1 (DuPage County, N.O.)
Poll utant Removal
"Wetlands help to filter pollutants
out of the water and filter
nutrients into the soil, enriching
the soil for future plant growth.
When water flows through thick
wetland vegetation and open
water, it slows down allowing
sediment and certain pollutants to
settle to the bottom. Over time,
the sediment becomes
incorporated into the wetland soil.
Over a very long period of time,
sediments build up so much that
the wetland may fill in and
eventually become dry land . This
process is called natural
succession."
Exhib it 7-1
Natu ral Watershed Benefits
F lood Control Groundwater Regeneration
"Wetlands can contain and slow "Wetlands also help to
down large amounts of water regenerate our groundwater
runoff from heavy storms supply by filte ring stormwater
resulting in less flooding . In fact , runoff though the system to
one acre of wetlands has the remove pollutants and returning
potential to store 1 to 1 Y. million it to underground aquifers.
gallons of floodwater." When water is a ll owed to pond
in a wetland, it may begin to
soak into the soil to an aquifer
below. The so il acts as a filter
which removes most
contaminants before it reaches
the groundwater supply."
Natural Habitat
"Many species of animals
and plants depend on
wetlands for habitat and
nourishment. Birds use
wetlands for nesting and
migratory purposes. Nearly
half of all endangered
species depend on wetlands
for survival! Wetlands also
provide habitat to diverse
plant life. Wetlands make up
approximately 5% of land in
the continental U .S., but
almost 1/3 of our plant
species can be found in
wetlands."
DuPage County has been recogn ized for havi ng a comprehens ive st ormwater
management program. A component of t his program is based on protecting the many
benefits provided by wet lands and buffers, primarily by enforcing the DuPage Cou nty
Countywide Stormwater and Flood Plain Ordinance. Since many wetland and buffer
functi ons are d ifficu lt, expensive, and somet i mes i mpossible to rep l ace, t he Ordinance
requires that an applicant avo id or m i ni mize impacts to wetland if poss i bl e. Wetland
Natural Resource Protection 7-2 2018
Natural Hazard Mitigation Plan
im pacts are to be replaced, or mitigated, in the same watershed. Impacted buffer
functions are replaced in kind. Wetland replacement ratios and buffer widths are based
on the quality of a wetland which is determined by analyses of habitat and vegetation
quality, and the presence of endangered or threatened species.
DuPage County Stormwater Management hosts training for environmental professionals
on regulations, wetland soils, botany, water quality, and more. County staff regularly
participates in professional seminars and community events as speakers, organizers, and
facilitators. Information about wetlands, wetland and riparian buffers, and water quality is
available on the County website.
Examples of wetland protection projects conducted by Stormwater Management, DuPage
County Building and Zoning, and mun icipa l partners can be found within Table 7-1. A map
of County wetlands can be found within Exhibit 7-2.
Table 7-1
DuPage Wetland Protection Projects
Project Location Status
Native Demonstration Garden 421 County Farm Rd, Wheaton Completed
-2009
Cricket Creek Wetl and Bank Cricket Creek Forest Preserve, Add ison Completed
-2008
Downers Grove Wetland Mitigation 40\11 St and Glendenning Rd, Downers Grove In
Proj ect Progress
Springbrook Wetland Migration Bank Springbrook Prairie Forest Preserve, Naperville In
Progress
7.3 Stream Restoration
Stream restoration activities have several names, such as "stream conservation",
"bioengineering", or "riparian corridor restoration." The objective of these approaches is
to return streams, streambanks, and adjacent land to a more natural condition, including
natural meanders. Another term is "ecological restoration" which restores native
indigenous plants and animals to an area.
A key component of these efforts is to use appropriate native plantings along the banks
that resist erosion. This may involve retrofitting the shoreline with willow cuttings, wetland
plants, and/or rolls of landscape material covered with a natural fabric that decomposes
after the banks are stabilized with plant roots.
Natural Resource Protection 7-3 2018
Natural Hazard Mitigation Plan
In all, restoring the right vegetation to a stream has the following advantages:
• Reduces the amount of sediment and pollutants entering the water
• Enhances aquatic habitat by cooling water temperature
• Provides food and shelter for both aquatic and terrestrial wildlife
• Can reduce flood damage by slowing the velocity of water
• Prevents property loss due to erosion
• Provides recreational opportunities, such as hunting, fishing, and bird watching
• Reduces long-term maintenance costs
The increased quantity of stormwater runoff entering receiving waters results in the loss
of equilibrium in natural water features and associated negative impacts such as
shoreline and stream bank erosion, channel down cutting, and wetland sedimentation.
Development within wetlands, floodplains, and riparian areas results in the loss of the
stormwater benefits provided by these water resource features further exacerbating
negative impacts to the watershed. Eventually, a point may be reached where the social
and economic costs due to the loss of water resources becomes unacceptable to the
populace. The cost to mitigate for lo st water resource benefits due to development can
be taxing on local and State government.
Maintaining Native Vegetated Open Spaces: An area of open space that is a minimum of
25 feet in width sha ll be maintained or established adjacent to Waters of DuPage where
the riparian environment or buffer is not present or is less restrictive than 25 feet. The
ground cover in this area shall be native, non-invasive vegetation. Enhancement of an
existing special management area may be considered a BMP where no enhancement
would be proposed as enhancement for impacts to Special Management Areas caused by
development. Maintaining or establishing natively vegetated open spaces that are not
considered a Special Management Area under the DuPage County Countywide
Stormwater and Flood Plain Ordinance ("ordinance") may also serve as an appropriate
Best Management Practices (BMP). These areas will be reviewed on a case by case basis.
The ordinance is identified as Appendix F of the DuPage County Stormwater Management
Plan . The ordinance is enforced Countywide through cooperation with County
municipalities. The ordinance is the primary regulation affecting new development within
the County. It regulates all activities that affect the discharge of stormwater. The
ordinance includes permit requirements for stormwater runoff, stormwater detention,
wetlands, floodplain, floodway, riparian, and water quality BMPs. The ordinance is
typically updated on an annual basis. It is important to refer to the current ordinance.
Natural Resource Protection 7-4 2018
The County of DuPage
Sormwa.ter Management
421 N. COOnty farm Rd .
W>ealon, IL 60187
~c~mber 2017
Natural Resource Protection
Natural Hazard Mitigation Plan
0
Exhibit 7-2
DuPage Coun t y Wetlands
DuPage County Wetlands
N -\Netlands 1 In = 2 mies w+e C3 Watershed Boundaries
o.s 1 2 Miles
11 11 11 I I I s c:J Township Boun~aries
7-5
...
Floodway
Zone A
•zoneAE
2018
Natural Hazard Mitigation Plan
7.4 Urban Forestry
Acco r ding to Tree City USA, a natio n al program sponsored by the Arbor Day Foundatio n i n
partners h ip with the U.S . Forest Service and t h e National Association of State Foresters,
maintaining an urban forestry program offers both d i rect and ind i rect benefits to a
commun ity and its residents. These benefits are outl ined within Exhib it 7-4 (Arbor Day
Foundation, N.D.a) By meeti ng four fundame nta l standards a community can become a
certified Tree City USA memb er, joi ning more than 3,400 other communities nationwide.
The Tr ee City USA fou r core standards of sound u rban forestry management are (Arbor
Day Foundation, N .D.b):
• Ma i nt ain ing a tree board or department.
• Hav i ng a community t ree ord i nance.
• Spend i ng at least $2 per capita on urban forestry.
• Ce lebrate Arbor Day.
Exh ibit 7-3 lists communities with in DuPage Cou nty that partic i pa t e i n Tree Ci t y USA
(Arbo r Day Fo u ndation, 2017).
Ex hi bit 7-3
Tr ee City USA Partic i pants
Community Name Years Partici pated Comm unity Name Years Participat ed
Addison 29 Lisle 25
Bensenville 26 L ombard 27
Bloomingdale 22 Naperville 27
Burr Ridge 23 Rose lle 31
Clarendon Hills 27 Villa Park 32
Downers Grove 33 Warrenville 30
E l mhurst 37 Wayne 20
G l en Ellyn 33 Westmont 21
Glendale Heights 20 Wheaton 31
Hanover Park 32 Wood Da le 12
Hinsdale 25 Woodridge 26
Itasca 32
Natural Resource Protection 7-6 2018
Natural Hazard Mitigation Plan
Exhibit 7-4
Tree Ci ty USA Benefits
0 Reduce cost s fo1 eu•rgy, &tOllll\\'At•r m•nagement, and erosion control . Trees yield 3-5 times ch ~ir cost in O\'erall
benefits to tli. city.
f Cut energy courumptiou b)· np to 25%. Studies indicate tliat as few as three additional trees planted 11To1md each
buildi ng in the United States N\lld saw S2 billion at111u.,lly in e nergy coses.
~ Boost p1·operty \'dl\les across )'O\lr conununity. Proptl'l)' pl,\ctd trees NII increas e pre> perry values from i -111 %.
Buildings in wooded areas rent mor~ quickly, a!ld ttllants stay longer.
¥ Bnild sh·ouger tiu to your n tighborhood and coum11111ity. Tree.s ,,nd green sp1ces directly correlate to greater
connections to neighbors.
11'1 Honor your comu11111 i ty and demonstrate your comminuem to a healtltier environment clu ough Arbor Day
celebrMions and Tru City USA recognition.
~ Ben•fit from a frntnework for action pro,·ided by the four core staudords. Many COllUlllnlities use the Tree City
USA standards as a wa y to begin coring for city trus. Others r•gularly •nhance urban fo r.st management through
improved ordmanc.s, h111ovatlve prognms and 111crea seJ emphasis on planting anJ ca re.
-· Educate peopl• l.h-ing i n your city n\>out the 1'8 lue oftreu Rud the unpot1anc• of sustainable hee 111anagement.
Annual participation as a 1he City USA co11111\unity provides this opportunity and makes it easier to engage indil·iduals
and organizations throughout th-. city. Tree City USA status can also create among wot king re!atiotuh.ip with your
state forest11• agency and other gto\lps.
,. l mpro\·~ comum1uty pride. Pankip•tion in the Tru City USA progr.un helps residents feel good about the place
they lh·e alld work. Annual recognition shows vis itors and prospective residents that trees, conse1v,\tio11, and the
tnvi.ronment are important to your comn\lu\ity.
1• Gain publicity w i th recognit ion materiAls. Tree boards. parks d epartments, public woi·ks officfals and \'Ohmteers
are re cogniud for the valuable work they pro\1de to the co11m1m1ity. Many communities share their Tree City uSA
recognition .iicross city de1?31~ment1 os well as with elected officials. students and bmineu le~deri .
7.5 Waste Management and Recycling
In 1 988, Illinois en acted the Solid Wast e Pla nn ing a nd Recycling Act. This Ac t man dat ed
t ha t "coun t ies must ea c h s u b mit t o the Illinois Environ menta l Pro tection Age ncy an
offici a ll y ad o pted plan for th e m an age m ent of munic ipal waste ge nerated wi t h i n its
boundaries. The Act serves to encoura ge t h e contin uous pla n ni ng for soli d waste
ma nage me nt a nd pu s hes loca l gove rn ments t o pe rp et ua lly m ove forward w ith a wa st e
redu ction an d recyc lin g age nd a" (DuPa ge County, 2017 , P. 3).
Th e 2017 DuPage County Solid Waste Manage me nt Pl a n "e valuates the was te disposa l
ca p ac ity of t he Co unty, electro ni c re c ycling coverage, and ident ifi es fo od sc rap coll ecti on
and compost fea sibility w ithin th e Co un t y. The initi a l Soli d Waste Management Pl a n
in c l uded multiple rec o mm en dat ion s to reduce , recycl e an d h an d le so li d waste . Th e
Na t ural Resource Protecti on 7-7 20 18
•I
Natural Hazard Mitigation Plan
County, a long with many valuable local government and private sector pa rtners
successfu ll y comp let ed several goals including: const ru cti on and opera tion of a regional
recyc li ng center and a household hazardous waste f acil ity; the estab lishment of severa l
recycling drop-off loca ti ons; a latex paint recycling and reuse program; an environmenta l
education program as we ll as su pporting reduced req u irements on construction and
demo lition debris recycling" (DuPage County, 2017, P. 3).
"In 2014, the Il lin ois Department of Commerce and Economic Opportunity commissioned
the Illinois Recycling Association who utilized COM Smith to complete a n update to the
2008 Ill in ois Commodity/Waste Generation Study 21. The repo rt deve loped metrics for
mun icipal sol id waste and industrial, commercia l and in stitutiona l solid waste generated
throughout the State of Illinois. Their methodology in c lu ded samplin g at landfills,
mode lin g to acco unt for moisture content and ca lcu lations for comme rc ially generated
waste. Th e data provides the State with a better und ers tanding of what items are being
landfi ll ed and e nables entities to prioriti ze efforts ba se d on rec ycling, diversion
availabi lity, and quantity of varying categories of wa st e . The data can a lso be folded into
st rategic planning effo rts at the county leve l" (DuP age County, 2017, P. 5). Based on this
st udy's findin gs, s tudy updates, and data co ll ected by DuPage County, estimates on total
Municipal Solid Waste (MSW) across the County for resident ial, institutio nal, commercia l,
and li ght-industri a l (ICI), and construction and demolition (C&D) have bee n collected . This
data can be found in Exhibit 7-5 (DuPage County, 2017, P. 8). In addition, waste and
recyc li ng da t a broken down by each munic ipa l ity can be found within Exhibit 7-6 (DuPage
County, 2017, P. 18).
Exhibit 7-5
Historical Wa ste Generation Estimates for DuPage County So lid Wast e Management Plans
Ill Popul ati on base d on growth estimates not actua l U.S. Census d n1a .
01 Rui c take n from Illinois Commodity/Waste Generation nnd C'hu mc tcriza tion Studie s
j,14.M§O
1,103,030
l ,jj81~
1,276 ;592
1 ~~n,1t~.
1,475,604
In 2014, th e Solid Waste Hauling and Recy c ling Program Act was adopt ed , requiring
waste management fa cilities provide recyc lin g services t o commercia l facilities within the
Chi cagolan d area (DuPage County, 2017, P. 3). "Alth ough com mercial waste franchises
are not typically found in DuPage County th e re a re a few municipa lities that maintain
these agreements, the Village of Add ison, the Village of Lombard and th e City of
Oakbrook Terrace. Th e commercia l waste fran chise agreement cover businesses and
mu lti-family structures waste and re cyc li ng services" (DuPage Co unty, 2017, P. 9).
Natural Resource Protection 7-8 2018
7 198.\l.S
tl 862.~I
hS611'2
6946 .6
11'2)1
53 27
m2 .n
820-I
10626
37405.1
2995
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0203~
51 56.05
'42-65
171 64
103l~l l
2034
lt~86
2J~.10~.u
Exhi b it 7-6
Mun icipa l Waste a nd Recyc ling
(,00 1,14
3,:J4,Q.1S'
2084 .84 586.87 2,67t71
~181>'.04' ".f.~11.$' 11 ~5~1 .84
3H4.5.I J,S48.!)9
I ~~
766.64
1204
1924
2420.07
11 2~
242 8 S63
'91o.3S 782.43
2893 m J,419.00
'409J l 1923 6.014,0()
156SS.08 6591 22!246 .08
"221 13()
892.95 892.95
1116' ~35.S
2819.54 773 .77 3,593.)1
191$ ~1 9.2 2;S~4'.~Q
(1592 3657 10.m.oo
M~.62 1it.2s ~.8).~1
'856 449 l ,:3~S.OO
1145 834 l i ~7 9 .00
88,.'178.81 63,(17.92 80,8~.41
Natural Hazard Mitigation Plan
3~
'9,812.66 27%
n.454.2$ ~5o/o
;m~
42".
IS,S?S.00 3 3%
l.\'1 %
46%
l -24%
8,118.00 36%
.S.02S,l0
11 ,623 .0(l 29%
1 ~64(1 .00 ·J'6Yt
59,651.18 37 'Y•
4}346.00 31%
W Y.
37 'Yo
1,6 16;88 ~6%
3,339.00 3 ~/o
~-3 6s:oo JI J l ~fo
23.4,009 .!16 34 '¥1
Hazardous Wa st e: "Si nce t he last so lid waste plan update, 2012, the City of Napervi lle
relocated the Ho usehold Hazardous Waste Faci lity t o t hei r Environmenta l Co ll ectio n
Camp us next to the Ci ty's Pub li c Wo rks fac i lity. The transit ion was made t o s i mp lify and
conso lidate recycling for res idents. The new faci li ty repo rted a s ign if icant i nc rease in
participation du ri ng the first year of operation . In 2016, t he s ite co ll ec ted an additional
67 ,000 ga ll ons of househo ld haza rdous wast e. The City re ported th at in 201 6 there were
over the 20,766 drop offs of w hi ch 12,594 were from Du Page . As partia lly funded
throug h t he Il li nois Envi ro n me nta l Protection Agency, th e faci li ty is ope n to all Ill ino is
residents and the City of Napervill e rece ives financ ia l suppo rt from DuPage , Kane a nd
Will co unties and t he City of Au rora" (Du Page County, 201 7, P. 10).
"Residents have other opportun it ies to d ispose or recycle specific sectors of househo ld
hazardo us waste. The City of Ad d ison has partne red with a local busi ness to recyc le
various types of batteries from thei r res idents. Other items t hat a re co ll ected by
bus in esses in c l ude compact fl uo resce nt bu l bs, paint, automotive fl uids, fire
Natural Resource Protection 7-9 2018
Natural Hazard Mitigation Plan
extinguishers, propane tanks. The County publishes an Online Recycling Guide to assist
residents in locating these recycling services. SCARCE, through the County's
environmenta l education contract and with private grant funding, has worked with various
entities to launch eight permanent, used cooking oil collection sites. These collections are
augmented by communities hosting one-day collection events following holidays like
Thanksgiving. The recycling of cooking oil is beneficial in that it can be made tnto a new
fuel source. It also reduces the amount of cooking oil and grease poured down drains
causing blockages in the sanitary system and treatment plants" (DuPage County, 2017,
P. 10).
Electronics: As of 2017, there are 17 items that cannot be disposed of through normal
household trash. "In 2016, the County pursued a system using a recycling fee for the
harder to handle items and relaunched two weekday collection sites and two collection
sites that are open one Saturday per month, both week day and Saturday programs are
staffed by the recycler. These are conducted through valuable partnerships with the
municipalities Burr Ridge, Lisle, Wheaton and Naperville. These communities have
voluntarily participated and have agreed to accept items from residents throughout the
County" (DuPage County, 2017, P. 10-11).
Additionally, "the Electronic Products Recycling and Reuse Act was significant ly amended
in 2017 and mandated a specified number of collection sites in counties based upon
population density. The changes are effective starting January 1, 2019 and the County of
Du Page is expected to receive 5 collection sites. The e lectronics manufacturers or a
manufacturer clearinghouse will be working with Illinois counties to id entify the locations,
hours, and other details for collection sites. The County continues to provide info rmation
and outreach materials on electronics recycling through flyers, socia l media, newsletters,
advertising, the online recycling guide and the website. A map of locations was developed
to display all available recycling options as well as aid in strategic planning of future
sites" (DuPage County, 2017, P. 11).
Sharp Items and Needles: "Sharps remain a difficult item to manage in the waste stream .
While the Illinois EPA allows households to place needles in a puncture proof container
for landfill disposal, this is not the preferred method" (DuPage County, 2017, P. 11). "The
City of Westmont included a sharps drop-off kiosk in their municipal waste contract
issued to Waste Management. The Village of Lisle offers a drop off point with the Rx Box
at the police station for res idents and the Glenside Fire District recently launch ed a
collection that is free for residents and for a small fee will accept the needles from
residents outside their district" (DuPage County, 2017, P. 12). The DuPage County
Geographic Information System (GIS) department deve lop ed a publicly available map of
prescription drug drop-off locations.
Landscape Waste and Food Scraps: "Diversion of landscape waste has been a statewide
priority since 1990 when the waste was banned from Illinois landfills. DuPage County
encourages the composting or reuse of landscape waste and prohibits the burning of the
waste for disposal in unincorporated areas" (DuPage County, 2017, P. 12). In addition,
the diversion of food scraps from landfills is also becoming a regional focus. "In response
to this measured increase statewide, the Illinois Food Scrap Coalition ("Coalition") was
Natural Resource Protection 7-10 2018
Natural Hazard Mitigation Plan
formed as a statewide effort to divert food scraps from land f ills. DuPage County is a
founding partner with the Coalition and has staff that participate on the Executive Board"
(DuPage County, 2017, P. 12). "Waste Management, Inc. has a perm itted landscape
waste and food scrap composting site in Romeoville and Midwest Compost, LLC has
locations in West Chicago and Elgin that are perm itted to accept and transfer food scraps
with yard waste" (DuPage County, 2017, P. 13). "Communities currently with a voluntary
curbside food scrap collection in clude; Glen Ellyn, Naperville, and Wheaton. In addition to
the curbside collections, Lombard provides alternative funding to support backyard
composting of food scraps" (DuPage County, 2017, P. 12).
Dumping Regulations: Best Management Practices (BMP)s usually address pollutants
that are liquids or suspended in water that are washed into a lake or stream. Dumping
regulations address solid matter, such as land scape waste, trash, shopping carts, and
appliances that can be accidenta lly or intentionally thrown into channels or wetlands.
Such materials may not pollute the water, but they can obstruct even low flows and
reduce the channels' and wetlands' ability to convey or cle an stormwater.
Many communities have nuisance ordinances that prohibit dumping garbage or other
"objectionable waste" on public or private property. Waterway dumping regulations need
to also apply to "non-objectionable" materials, such as grass clippings or tree branches
which can kill ground cover or cause obstructions in channels. Regular inspections to
catch violations should be scheduled.
• Fo r example, the DuPage County Building and Zoning Department works closely
with our partner agencies including all local townships within DuPage County, the
County Sheriff's Office and the County Health Department to enforce dumping
regu lations on properties, in public rights-of-way and waterways in DuPage County.
• DuPage County has also partnered with th e Illinois Environmental Protection
Agency (IEPA) and has entered into a delegation agreement for enforcement of
IE PA regulations within regards to land management.
• To facilitate more efficient compliance with these regulations, the County has
created a Code Hearing Adjudication Program (AAP); to wit:
o The AAP enables the County to use existing County staff to administer the
program and will reduce the department's dependency on the staff of the
County Circuit Court Clerk, the County Sheriff's Department, the Judicial
System and the County States Attorney's Office. As such, the AAP provides
an exped ited and cost effective means to obtain compliance for time
sensitive violations and violations that have a direct negative impact on the
quality of life for the citizens of the Coun ty.
o To expedite judgments for time sensitive violations such as failure to obtain
permits, dangerous and unsafe buildings and structures, junk and debris
and zoning violations.
Based on Exhibit 7-1, most land development and many land use activities invo lve more
than one, if not all of the targeted pollutant categorie s. Therefore, consideration must be
given to the magnitude of each pollutant category with respect to the development or
activity so that correct, efficient, and cost effective BMPs can be se lected for each
Natural Resource Protection 7-11 2018
Natural Hazard Mitigation Plan
targeted category. Numerous stud ies have been compl et ed i n recent years iden t ifying
that one of t he more critica l pollutan ts caused by most types of urban develop ment and
activity is Tota l Su spe nded So li ds (TSS). Common TSS con stit uents in urba n areas a re
sed im ent, float ing de bris, and disso lved ch lori des and s ulfates . Fortunately, BMPs
common ly used t o re d uce TSS, also effectively m it igate stormwa t er po ll utants i n other
pollutant cat egories. For instance, hea vy m et als such as lead, nicke l, coppe r, and zinc are
often attached t o sedimen t. Th is he lps si mpl ify the se lect ion process i n many cases as
se lecting BMPs th at target TSS will likely be more cost ef f ective and effici ent t hen
se l ecting a BMP for each t arget ed category. As a result, many types of BM P des igns and
pre manu f act ure d products are now ava i la bl e t o address TSS .
Stormwat er po llut a nts enter rece iv ing wat e rs fro m "po i nt" and "non -poin t " sources. Point
sources refer t o pollu ta nts origi nati ng from sources s uch as reg ulat ed d isc ha rges, a nd
accid e ntal or i ll egal dumping. Non -poi nt sourc es or iginate from stormwater runoff tha t
picks u p and t ra nsports natu ra l and man -made su bsta nces into receiv i ng wa ters.
Common po ll utants found i n DuPage Co unty a nd thei r assoc ia t ed impacts are shown i n
Exhibit 7-6 (DuPage Co u nty Wate r Qual ity Best Management Prac t ices Technica l
Guidance, 2008).
Exhibit 7-6
Common Pollutants in Urban Runoffs and Associated Impacts
l'olhtlnnt Sou re~ lnl 1>arl s
Sl'll<h (n~p.:n&:d sdim~I . l .i ll~r. ro.1d t\IOO IT,oo ll cmslon from l ~'TCA,l(d l1V!i<lily, lll\!U1;\'11 light
Oo.t~bl.s, d iSStll \~d d 1lmid..•, C(lnllr uc:1 i01~ s1.r.-aml,1n~s. rnipl3nd s l'.'<'bl113i-Oll, iml'l i"'J r.:srirulioo fot
sulfal-5) and ur~r ea1\Xl sl 1es, cl ~~""' aqu1•ic Ii ,_., itrtiaiom.?01 of fisltifll!
\'CJ!CUdlon, h u~1n & tinimtll wu.1.:. t anutccs, incl<"ru<d 5<.'ll lm<;ntalinn,
n l~c l~ rucl s & Ouids, Hhkl<: \\l:P t, w'lc kl 11<1U!Ck lirc, pcwots
i ndu>lriu!Jbo~ho U t11dn i:~h. wr 1 l~I Sf'r i lfJ ini~ing
indu.iri ol 11nicC<Sc<, p.>c~ w01c1>
dis<h.1Jj!<d lnlpt1'1Xl ly, 10.1d .. 11
ui.:il ~1 1 lk·idn11, ~now mn()(f
llll'>1l>1ml:nl U\yll"n IJcmnnd Occfl)'iiig ''~\1a1ioo, c~c~ss!w Kll b~1 w1kllfc
1 row th o f>'<gf tation,soil erosion,
hu111an & anh11~ Wll.ll c, w hic.le rwb
& O ui d ~ vcl>klc \war,
indu $1tj al/J-.\U!(oo U ~ho:m l;als.
industria l «ocO.s.::1 . n.!slicid<:s
Mcl1tls (•:11dmilm1, Chromi um, Rood lllllllff. 1i11: 11~o r;wQtr (!( T1>~ic IOil<jllil1k lif.; po i.o nti1l IOr
('-0ppt_1, 1r,,n, uad, ~kl•"'l'· dukh an<I brake li nin~s, so il IJIOOnd 11a1.?r Nnl ~mim1ion,
Nidd, Sil l'<I, Zi nc) c1111lon,hwi1'1n.& onim;i l ll':lslc, act"nrubtc$ In ~sh and :shcll fim
"~hi~1~ fllcls & n ui d~. nilkk 111:M, tlM11'11 lh~ rnoy Ill' consumed hy
intlils1ria l/b.1m>:11()U chrn1l:a ls. hum:u~
indusula l piuto'Ses, p.'tinl>,
pcslici dc5
Pathog~s (\.acklin, f«'<l l oo ll ~nn) Sep ll; tullk °''',nows/1ooks/lll ilur <£, Uns;i frn"1<1i 1k>rl$ fo1 l1 un1Jn
illidl disc;hJ lg<" rr ijn l'<lni lDJ)' S<.'\l'tf$ con1J1:1/sw hn111in11. ck-..<d btl<lth..'1'
into Monn "111~~ SJnnari· ~111:1 conttmina tcd groun<I nnd dri nk111$
<>1'<1 n uws. unuca 1c:d « WOh.Y
inod..'qW1d y wa1c:d s<w~ll'""n imal
wa~1c
Ol (ui l, )!W~SC.\ rud ~. lubrkants) bxl uitri~I "!'ill>, 11JOOIHrum st ri\:~~. Kills aijlllli d ifc, builds u p ln
s nss1,.lons, ~ r all<ln~ l111s. !'l'dimci11aod 1ormins for a Ions
hnJ!r(lf'l'r di sposal or 11!.<d oil Into I i~ .
slormdrdins, bllsi~.1Sdisl1 itts,
sl•ippi ns (cntcis; ,-.(6ce pa rk $,
nhicle f~l s t't Ould s, r\li:I
<ol!lbuSli<m. l nt~sl!ia llho~li.Jld
ch.,ll k'i11S, ilfdJiS11i1 I pt<X'.llS!-1.'$,
nal nb
N u1ric n~>(N ilm11"n, ~h fCSl'hllt\l!l, Ag rl c~hurc, lmpro Jl"rC00'4!('<$\i ng IXl'J'~o! d iSS()l\·t'd oxyg<n lc ~cl ;
Ni lll>l<s; and yzi nl waste dis1"'5ill, >q!lk ckvalw pb)1<lp1anl.1<in p.>j"t ul nliom,
tan!(,, sol i <'!().lion, c !c~11...i l'lsll kills hy b)1'0xio & eooxl ,,
\'t8"~di an, rt11 iltl<R, nnimnl \\11!1(, re!<~ cf,1oxins fi \1111 >edinicnts,
fu<I cvmbuslii•t, dmc....,d ftsh:rics yields, ""'Y
lnd11 s1rial/ho1t1<:hokl ch<ll\l.:al~. c1)ntmnin"~· 1VOH nd w111c1, ~xccs.,lw
indu s11i4I )YOC.:>S cS , btmo;pheri~ plun l gr O\\'th
de JX'Silio n 0011) irn l"'~ilius ru1rtt1~•
lho l bi<on>e MJMIT
ll"hkioles, l'a.tk:l cl"", ln i.o:<11cid<s bnp11>ptt 1• et"'~"< us< .,r lawn
cha niai l!< aaric uhu re
Alg.:ic blomn \ li•h kllls
Natural Resource Protection 7-12 2018
Natural Hazarcl Mitigation Plan
7.6 Conclusions
1. The County recognizes the im portance of stream restorat io n and wetland protection,
and incorporates best management practices throughout projects.
2. The County has an effective and comprehensive waste management and recycling
plan, and is working to expand related programs in partnership with DuPage
municipalities.
3. There is no countywide ordinance that prohibits dumping of yard waste and other
debris in streams or other parts of the drainage system.
4. Many DuPage communities have effective urban forestry programs in place.
5. The DuPage County Forest Preserve District has successfu lly accomplished its initial
goal to preserve open space, and is working to establish secondary goals of
maintaining and enhancing this space.
7. 7 Recommendations
1. Municipal comprehensive plans, land use plans and zon ing ordinances should
incorporate open space provisions that will protect properties from flooding and
preserve wetlands and farmland.
2. Communities should continue to enha nce waste management and recycling
programs, with an enhanced focus on specialty disposal programs (i.e. hazardous
waste, electronics, needles, landscape waste, and food scraps).
3. Each community should ensure that it has enforceable stream and wetland dumping
regulations.
4. Every community shou ld develop or conti nue to implement an urban forestry program
that qualifies them to become a Tree City, USA.
Natural Resource Protection 7-13 2018
Natural Hazard Mitigation Plan
References
Arbor Day Foundation. (N.D.a) Benefits of the Tree City USA Program. Retrieved on:
December 26, 2017. Retrieved from:
https://www.arborday.org/programs/treecityusa/benefits.cfm
Arbor Day Foundation. (N.D.b). Tree City USA Take Pride in a Greener Community.
Retrieved on: December 26, 2017. Retrieved from:
https://www.arborday.org/programs/treecityusa/bulletins/documents/OOO-
summary.pdf
Arbor Day Founda tion. (2017). 2016 Tree City USA Communities in Illinois. Retrieved on:
December 26, 2017. Retrieved from:
https://www.arborday.org/programs/treecityusa/treecities.cfm?chosenstate=lllin
ois
DuPage County, Illinois. (N.D.) Wetland Frequently Asked Questions. Retrieved on:
December 26, 2017. Retrieved from:
https://www.dupageco.org/EDP/Stormwater Management/Natural Areas/30881
/#wetland benefits
DuPage County, Illino is. (2008). DuPage County Water Quality Best Management
Practices Technical Guidance. Retrieved on: December 27, 2017. Retrieved from:
https://www.dupageco.org/EDP/Stormwater Management/Water Ouality/1424/
Du Page County, Illinois. (2017). Solid Waste Management Plan Five Year Update 2017.
Retrieved on: December 27, 2017. Retrieved from:
https://www.dupageco.org/Waste/
Federal Emergency Management Agency (FEMA). (2017). National Flood Insurance
Program Community Rating System Coordinator's Manual. Retrieved on :
December 7, 2017. Retrieved from: https://www.fema.gov/media-library-
da~/1493905477815-
d794671adeed5beab6a6304d8ba0b207 /633300 2017 CRS Coordinators Ma
nual 508.pdf
Forest Preserve District of DuPage County. (N.D.) This Land Is Your Land. Retrieved on:
December 26, 2017. Retrieved from:
http://www.d u pa geforest.org/a bout/prese rvi n g-open-s paces
Natural Resource Protection 7-14 2018
Natural Hazard Mitigation Plan
Chapter 8 -Emergency Services
Emergency services activities are conducted prior to and during an emergency to
minimize the impact of a hazard. This mitigation category primarily focuses on life safety
and property protection. The emergency services, or emergency management, sector
follows guidance from the Federal Emergency Management Agency (FEMA). The FEMA
recommends emergency management agencies strive to achieve the National
Preparedness Goal by being successfu l within 32 core capability areas, which span five
different mission areas: Prevention, Protection, Response, Recovery, and Mitigation.
Given that Prevention focuses mostly on made-made events, such as terrorism, th is
chapter will exclude this mission area.
National Preparedness Goal
"A secure and resilient nation with the capabilities required across the
whole community to prevent, protect against, mitigate, respond to, and
recover from the threats and hazards that pose the greatest risk"
(FEMA, 2017a, P. 1).
Emergency services activities are usually the responsibility of municipal and/or or County
emergency managers. In smaller communities, the designated emergency manager may
also be a full-time police officer or firefighter. Emergency services activities can also be
conducted by private industries responsible for critical facilities or providing critical
services such as communication and energy. Activities may include, but are not limited to
(FEMA, 2017b, P. 510-20):
• Hazard Threat Recognition
• Critical Facilities Protection
• Hazard Warning
• Health and Safety Maintenance
• Hazard Response Operations
• Post-Disaster Mitigation Actions
The DuPage County Office of Homeland Security and Emergency Management (OHSEM)
coordinates emergency management services in DuPage County. Activities of the OHSEM
include: activating the County Emergency Operations Center (EOC) during disasters;
coordinating resource procurements and logistics during an emergency; coordinating and
overseeing the Local Emergency Management Coordinators (LEMC) Workgroup;
participating in the National Weather Service's (NWS) Storm Ready® certification
program; conducting an annual Threat Hazard Id en t ification Risk Assessments (THIRA) in
coordination with the Illinois Emergency Management Agency (IEMA); developing a
County-Wide community profile with critical infrastructure and incident data; coordinating
and overseeing the DuPage County Citizen Corps; overseeing the development and
maintenance of this Natural Hazard Mitigation Plan; and developing other emergency
plans focused on natural hazards.
Emergency Services 8-1 2018
Natural Hazard Mitigation Plan
8.1 Protection
Preparedness Planning: The objective of preparing emergency plans is to create the
capacity for County and local government to: save the maximum number of lives in the
event of a major emergency or disaster, to minimize injuries; protect property; preserve
functioning civil government; and to maintain and support economic activities essential
for the survival and eventual recovery from the emergency or disaster (DuPage County,
2016, P. 2). The DuPage County has an Emergency Operations Plan (EOP), formally
approved by the County Board Chairman, which includes hazard specific plans for natural
hazards. The County's EOP is approved every two years by IEMA. In addition, the OHSEM
coordinates the certification of local emergency management and emergency services
disaster agency EOPs every two years. As of December 2017, all DuPage County
municipalities had up to date certifications. The County, and most DuPage municipalities,
have designated spaces to serve as an Emergency Operations Center (EOC) during an
emergency. Table 8-2 provides information about some of the content within each
municipality's EOP. The OHSEM is currently working to update policies and procedures for
damage assessment and disaster recovery, per FEMA's new guidance from 2018. Once
complete, the County plans to encourage similar changes within municipal emergency
planning. In add ition, the OHSEM is currently working to coordinate the development of a
Countywide Continuity of Operations/ Continuity of Government Plan. This project
includes the identification of secondary
locations for all departments, which may be
applicable to municipalities in the future.
Stakeholder Engagement: In addition to the
Local Emergency Management Coordinators
(LEMC) Workgroup, which meets quarterly to
coordinate planning efforts and share
Du Page Coun t y ~
citizen:;tcorps
"Citizen Corps Councils helps drive local citizen
participation by coordinating Citizen Corps programs .
developing community action plans . assessing possible
threats and identifying local resources."
information, multiple communities have established volunteer programs to expand the
County's capability to respond to emergencies through volunteers. The USA Freedom
Corps, and is a local council that coordinates federal, state and local volunteer program
efforts, sponsored by the federal government. Nationally, programs that are coordinated
under the Citizen Corps council are the Community Emergency Management Teams
(CERT), the Neighborhood Watch, Volunteers in Police Service (VIPS), and the Medical
Reserve Corps (MRC). Specific communit y information can be found within Table 8-1.
Annually, the OHSEM hosts outreach events where weather radios are provided to
residents, at no charge, in coordination with the City of Chicago as part of the Regional
Catastrophic Preparedness Grant Program. And in the past, the OHSEM has coordinated
the distribution of weather radios to childcare, daycare, health department, and other
government buildings.
Mutual aid agreements are in place throughout the County for Fire (Mutual Aid Box Alarm
System (MABAS)), Police (Illinois Law Enforcement Alarm System (ILEAS)), Emergency
Management (Illinois Emergency Management Mutual Aid System (IEMMA)), Public
Health (Illinois Public Health Mutual Aid System (IPHMAS)), and Public Works (Public
Emergency Services 8-2 2018
Natural Hazard Mitigation Plan
Wor ks M utua l Aid System (PWMA)). These agreements can be ut il ized i n an y phase of a n
eme rge n cy or d isaster.
Village of Addison
City of Aurora
Village of Bartlett
Village of Bensenville
Village of Bloom ingdale
Village of Burr Ridge
Village of Carol Stream
Village of Clarendon H ills
Cit y of Darien
Village of Downers Grove
Ci ty of Elmhurst
Village of Glendale Heights
Village of Glen Ellyn
Village of Hanover Park
Village of Hinsdale
Village of Itasca
Village of Lis le
Village of Lombard
City of Naperville
Village of Oak Brook
City of Oakbrook Terrace
Village of Roselle
Village of Villa Park
City of Warrenville
Village of Wayne
Cit y of West Chicago
Village of Westmont
City of Wheaton
Village of Willowbrook
Village o f W infield
City of Wood Da le
Village of Woodridge
DuPage County
Mil ton Township
Emergency Services
Tab le 8-1
Commu ni ty Vo l u nteer Programs
Community Vol u n tee r s
Emergency in Police F i re Corp s Respon se Servi ce
T eam (CERT) (VIPS ) P r ogram
P r oa ram Proa r am
Yes Yes No
Yes Yes No
No No No
No No No
No Yes No
No No No
Y es Yes No
No No No
No Yes No
No No No
No Yes No
No No No
No No No
Yes No Yes
No Yes No
Yes Yes No
No No No
No No No
Yes Yes Yes
No No No
No No No
No Yes No
No No No
No No No
No No No
Yes No No
Yes Yes Yes
No No No
No Yes No
No Yes No
No Yes No
No Yes No
Yes Yes No
Yes No No
8-3
Medi ca l Other
Reserve Cor ps Emergen cy
Services (MRC) Volun t eer P rogr am Progr a m
No Unknown
No Unknown
No Unknown
No Yes
No Unknown
No Unknown
No Unknown
No Unknown
No Unknown
No Unknown
No Unknown
No Unknown
No Unknown
No Unknown
No Unknown
No Unknown
No Unknown
No Unknown
No Unknown
No Unknown
No Unknown
No Unknown
No Unknown
No Yes
No Unknown
No Unknown
No Unknown
No Unknown
No Unknown
No Unknown
No Unknown
No Unknown
Yes Yes
No Unknown
2018
Natural Hazard Mitigation Plan
Table 8-2
Municipal Em ergency Operations Pl an Pro cedures and Mitigation Actions
Natural Critical Activation
Hazard Infrastructure Capability Special and Declaration Community
A ssessm ent Identification Assessment Populations Notification Process Profile
Included Included Included Considered Process Outlined Included
Outlined
Village of Yes Yes No No Yes Yes Yes Addison
Villag e of Bartl ett No No No No No Yes No
Village of No Yes Yes No Yes Yes Yes Bensenville
Village of Yes Yes Yes No Yes Yes Yes Bloomino da le
Village of Burr No Yes Yes No Yes Yes Yes Ridge
Village of Carol Yes Yes Yes Yes Yes Yes Yes Stream
Village of No Yes Yes Yes No No Yes Clarend on Hill s
City of Darien Yes Yes Yes No Yes Yes Yes
Village of Ye s Yes Yes Yes Yes No Yes Downers Grove
City of Elmhurst Yes Yes No No No No Yes
Village of Yes Yes Yes Yes No No Yes Gle ndale Heicihts
Village of Glen Yes Yes Yes No Yes Yes Yes Ellvn
Village of Yes No Yes Yes Ye s No Yes Hanover Park
Village of Yes Yes Yes No Yes No Ye s Hinsda le
Village of Itasca Yes Yes Yes Yes Ye s No Yes
Vi ll age of lisle Yes Yes Yes No Yes Yes Yes
Village of Yes Yes Yes No Yes No Yes Lombard
City of Naperville No No No No No No No
Village of Oak No No No No No No Yes Brook
City of Oakbrook No Yes Yes Yes Yes No Yes Terrace
Village of Rose ll e No Yes Yes No Yes Yes Yes
Village of Villa No Yes Yes No Yes Yes Yes Park
City of Yes Yes Yes No No Yes Ye s Warrenville
Village of Wayne No No Yes No Yes No Yes
City of West No No No No No No Yes Chicacio
Village of Yes Yes Yes No Yes No Yes Westmont
City of Wh eaton Yes Yes Yes No Yes No Yes
Village of Yes Yes Yes No No No Yes Willowbrook
Village of Yes Yes Yes No Yes No Yes Winfield
City Wood Dale Yes No Yes Yes Yes Yes Yes
Villag e of Yes Yes No No Yes Yes Yes Woodr idqe
Threat Recognition: The firs t step in being able to effectively respond to a natural hazard
is to identify the threa ts assoc iated with the hazard, specific vulnerabilities, and
capabilities the community ha s to respond to h aza rd if it were to occur. Every two years,
t he OHSEM completes a Threat Haza rd and Identification Risk Assessme nt (THIRA) as
Emergency Services 8-4 2018
Natural Hazard Mitigation Plan
required by IEMA. The OHSEM works with subject matter experts from the County and
other private stakeholders to address and rank natural hazards, identifyi ng further needs
to increase community resi l iency. For more information on threat recognition specific to
each hazard, see Chapt er 2 .
Cr itical Inf rastructure Identification and Protect ion: While protecting critica l infrastructure
from a disaster is the responsibility of the owner or operator, utilizing public-private
partnersh i ps to mitigate and respond to the effects of hazards is a best practice . When
critical i nfrastructure is affected by a natura l disaster, an entire community can
experience i mpacts. When referencing cr itica l infrastructure, this pl an utilizes the 16
sectors identified by the Department of Homeland Security (OHS). Exhibit 8-1 shows each
of the sectors and t heir federa l oversight agencies (OHS, 2017, P. 1).
Exhib it 8-1
Department of Homeland Security Critica l Infrastructure Sectors
• • II
Chemical seoto<
The Department pf Home ta rid Se.."vrify is desiiinated as the Sector-Specific
'*nr::1 for the Chemicel Sector.
commeccja! FaCITlties sector
The Oepa~t' of HMl&nd Se..vri!y iS designated as the Sector·St)ecif.c
~ncyfor tile aommerci el FacRities Seaor.
r.ommunicaHons Sector
The Communicatioos Sector is an intevo1component01 the U.S. economy,
ullder~tngtlle oper<llions of 1111 b<Jsin~s. j>vbficsafey 01g8nlzatlons, e(ld
goverlll!1ent ~ Oepa~nt d Homelan<:f SecurfylS the SY_,\or·S~iflC
pgencyfor the C.OmmunicatiQns.Sector .
Critical Manufacturing Sector
Tile Oepartrwlt or Homl!lllnd Secu~ rs d~ilin ilted es the ~tor.Specific
"'ency fol tlleC<it~al M5!\Uf~uitOllSector. -
[)ams Sector
The Oep&rtme!)t Of Homelend S«urit)l Js d~ignate<I &s theSector-Spe-."ific
,o\ieni:yf9f t/\e_Oems Sector. Tile Dams Seetor comp~s dam projects,
navliation locks, le•-ees, hur~rie t>arriers, mine tailings impoundments , aw.!
other similar water retention and/O! llOlltlol facilities.
Defense lndusbial Base Sector . .
Th.e us. Department o( Defense iS t~ seaoc-Specific Agencyfor the Defense
lf\dustrial Base Secio1. The Oefens_e 11\dustrial !lase Sector enables reseercl\,
df~ekl9n>ent, <leSign, produCticrl, deliveiy, end 11)8intenimte of mil(t.ery
weii(>ons S)'Stems. subS}"S(ems, end coinpon~nts or liens to meet U.S. military
req\llrement5.
Emergen!!VServioes sector
The DeperoneJ\t_ Q( H;>melend Securi\Y s d~l~ied as th e Sector-Specific
~~cy ror tile E~ency Ser.vieeS SE\:tor. The se~Of p10\'ldes a vii<le len6:e Of
preyenilon, piepore<1r.es~ 15poose, and recove:ysetvlces du1infl both dey-to-
<lay oj>efation~ and Incident response.
Ellentt $ector
'The US. erie~ infrestruclu!e f9etS the e~ry.i~ of the 2151 century. The
Department of E11ert1 is the Seclor·Specific ~gencyfvr the Enerl!Y Se::to1.
I
Financial Se!Vlces Sector
The. De~rtment d tlie Treas11ry is desitnated es the Sector-Specifk Aae.ncy
fo< the FUlllnciol Seriioes ~·
Foo<! and Mrioultum sector
The Qepartmentd AV.cultureal\d~ Oep&Mlemof He_elth an\l l;fuman
Setvlces ere desigllat~:I as the co-Seelor-S~ltic Agencies for the Food e11d
.AJifjc~iture See<.or .
Government Fa®i!ies sector
The Depsnment d llcJllelllnd Securhy an4 tile Genefa l Services
Mnilnistleiion i!re ~~~-as the Co-Sect0r·Specifi-: Ag encl es for me
C'°"ernment facilities Sector.
Heafthcare and PubfJG Health Sector
The Department d Health end -Human Ser;kes Is <l~sil{nated es !he Seetot-
Specific ~for ihe Heslthcere and Piib!ic ~~llh Seetor. I .
lnfonnation Technology SeclDr
T~ ~p&rt.'llel)! of Homeland ~url!y is deslitna!ed 8S the Sector-Spe<:ific
,t.~ncy for the lnformtltion T ecilno~ Secti>f. ·
Nuclear Reactois. Matemls and Waste Sector
The Oeparunent of Hom.~lllnd Se_curityis desigrie\ed as the Sector-Specific
Age~ for tM Nu cl est Reactors, Materials, and Waste sector.
TransoortaUon Ststems SectDr
Tl)e .Qepa rtment d Horn.eland Sec11iil;y end l/ll! ~M\ent of T ransport6tior
are d~ted as the e»-Se~or·Specific A4t!ncies for Ille Transport6tioll
~stems 5¢or.
Water and Wastewater systems Sector
The Environmental Plotection Agency i!; desij!n6ted es the Sector· Sp~
~t;encjfC.r !he Wal.el f!lld W~t~Yater ~'Stems Sector.
The OHSEM is working to deve lop a Geographic Information System (GIS) based County-
wide community profil e, to include critica l infrastructure locations and characteristics .
Emergency Services 8-5 2018
Natural Hazard Mitigation Plan
The completion of this project will allow the County and partnering municipalities to:
identify vulnerabilities before a disaster strikes, develop strategies for reducing these
vulnerabilities, and to respond quicker in identifying impacted infrastructure following a
natural disaster. In addition, DuPage County Stormwater Management is working to
identify and map critical facilities, already identified, that are within flood prone areas.
Some critical facilities such as hospitals and nursing homes are required by state statute
to establish and maintain backup generators to ensure electrical power can be
maintained at minimal levels. DuPage County has several critical facilities on its County
Campus such as the Jail, DuPage Care Center, and the Emergency Operations Center.
DuPage County invested in backup generation for all County campus buildings. Most
police and fire stations throughout the County currently have backup generators.
Mun icipalities should continue to identify key facilities and establish backup systems as
budgets allow. Table 8-1 shows communities that have incorporated critical infrastructure
within their EOPs. Additional information on protecting critical facilities can be found in
Chapter 5, which discusses the importance of protecting critical facilities from damage.
Storm Ready® Participation: The National Weather Service established the StormReady®
program to help local governments improve the timeliness and effectiveness of
hazardous weather-related warnings for the public. To be officially StormReady®, a
community must:
• Establish a 24-hour warning point and Emergency Operations Center (EOC)
• Have more than one way to receive severe weather warnings from the National
Weather Service (NWS) and provide forecasts and to alert the public
• Create a system that monitors weather conditions locally
• Promote the importance of public readiness through community seminars
• Develop a formal hazardous weather plan, which includes training severe
weather spotters and holding emergency exercises.
Being designated as a Storm Ready® community by the Weather Service is a good
measure of a commun ity's emergency warning program for weather hazards.
Un incorporated DuPage County, as well as many municipalities and even Colleges and
Universities within DuPage County, are certified through this program (NWS, 2017, P. 1).
8.2 Response
The protection of life and property is the foremost important task of emergency
responders. It is important to note, that emergency responders go beyond just police, fire,
and emergency medical response. This category can also include public works, engineers,
and many more. Two factors that can increase a community's resilience are adequate
and timely threat recognition and public warning systems. The National Weather Service
(NWS) is the primary agency for detecting meteorological threats, such as storms (snow,
rain, hail, etc.) and tornadoes. The NWS primarily issues notices to the public using three
levels of notifications: advisory, watch, and warn ing. Severe weather warnings are
transmitted to emergency service agencies by NOAA, via phone call, text, email, and the
Weather Radio System. When an advisory, watch, or warning has been issued, or when a
natural disaster has struck, emergency management representatives from the County,
Emergency Services 8-6 2018
Natural Hazard Mitigation Plan
municipality, and even private companies and non-profits often take or coordinate the
fo llowing actions to respond :
• Activate warn i ng and monitoring systems not yet operational.
• Activate an Emergency Ope rations Center to enhance coordination, oversee
resource p rocurement, and assist with logistics.
• Close streets or bridges to prevent the public from encountering hazards, and
prioritize c learing critica l transportation routes.
• Declare a state of emergency or disaster.
• Shut off power to threatened areas.
• Distribute supplies t o residents and businesses (i.e. sandbags and c lean-up kits).
• Order and begin conducti ng evac uations.
• Open and sta f f s h elters, mu lti-agency resource centers, and other ass istance
cente rs .
Fo r furthe r i nformation on threa t recognition and t he NWS information associa t ed with
each natura l hazard, see Ch apte r 2.
Pu b li c Warn i ng Syste ms: When the County and local governments need to share critica l
and t i me sensitive information with the public, emergency services agencies use multiple
notifications systems made available through the Federal Emergency Management
Agency's (FEMA) Integrated Public Alert and Warning Sys t em (IPAWS). The system "is a
comprehensive, coordinated, integrated system that can be used by authorized public
officials to deliver effective alert messages to the American public" (FEMA, 2013, IS-
24 7.A: Integrated Pu blic Alert and Warn ing System) via multi ple emergency
communication and warning p latforms such as:
• The Emergency Alert System (EAS), which may be used by State, County, a n d loca l
authorities, in cooperation with the broadcast community, to deliver important
emergency information, (i.e. weather information, imminent threats, and AMBER
al erts) via radio (A M/FM/Satel lite), television, ana log and digita l phone li n es (OH S,
2017a, Emergency Alert Syste m (EAS).
• Wi re l ess Emerge ncy Al erts (W EA), whi ch may be used by State, Cou nty, a nd loca l
auth orities t o de live r impo rta nt eme rge n cy in forma tion th roug h the ce ll u la r p hone
network (O HS, 201 7 b, Wi rel ess Em ergency Alerts (EAS).
• The Nation al Ocea n ic an d Atmospheric Administration (NOAA) weather radio
system, which can be t i ed to tone-activated receivers in key facilities, s uch as
schools, hospitals, and government facilities, through the Emergency Alert Radio
System (EARS) (OHS, 2017c, NOAA Weather Radio All Hazards (NWR)).
In addition to these systems, the IPAWS coordinated with internet service providers to
disseminate information through social media p latforms. Also , local public safety
answering points (PSAPs) are responsible for activating loca l outdoor sirens for weather
re lated incidents. The earli er and t he more spec ific the warn i ng, the greater the n u mber
of people who can implement protection measures. Exhibit 8-2 (OHS, 2017d) outlines the
IPAWS.
Emergency Servi ces 8-7 20 18
Natural Hazard Mitigation Plan
Exhibit 8-2
Integrated Public Alert and Warning System
I PAWS Architecture
~11)f'rd1 r ~' t>~w.1 O l~•l rr~~,.,,il~ ;>!Olll<'Ol1 , a<..(lieNl~lr.<:l ole•l ll'~)-"10' xind<!t), ,h~t ed . f/•1t.o~ ~.r ,., ~ d•:~:lb\~lo n n~t .. Q-•>'· A l ~m ti<l •vt10<1 I ~ •rt,rq pl.(llO; rrc~rll ('f tlf""i~\
I
I • I •
!PAWS rnm pllMI CAP
Al 11ft Ongioa tl <>n Tools
.. !& FEMA ",~· -
Multiple or redundant systems are most effective -if peop le do not hear one warning,
they may still get the message from another part of the system . Each has advantages and
disadvantages:
• Radio and television provide a lot of information, but people need know when to
turn them on.
• NOAA Weather Radio can provide short messages of any impending weather
hazard or emergency and advise people to turn on their radios or tel evisions, but
not everyone has a Weather Radio.
• Outdoor warning sirens can reach many people quickly as long as they are
outdoors. They do not reach people in tightly-insulated buildings or those around
loud noise, such as in a factory, during a thunderstorm, or in air-conditioned
hom es. Outdoor sirens do not explain what hazard is coming, but people should
know to turn on a radio or television.
• Automated telephone notificat ion services are also fast, but can be expensive and
do not work when phone lines are down. Nor do they work for unlisted numbers
and call screening services, although ind ividuals can s ign up for notifications.
• Where a threat has a longer lead time, going door-to-door and manual telephone
trees can be effective.
Just as important as issuing a warning is informing people what action(s) to take. A
warning program should have a public information aspect. People need to know the
Emergency Services 8-8 2018
Natural Hazard Mitigation Plan
difference between a tornado warning (when they should seek shelter in a basement)
and a flood warning (when they should stay out of basements).
Communication: Since 2007, DuPage County first response agencies have maintained
interoperable communications, between disciplines and jurisdictions, through the
STARCOM21 system. The DuPage County Emergency Telephone System Board (ETSB)
has oversight of the enhanced 9-1-1 systems for citizens of the County of DuPage and
portions of Cook, Kane and Will counties. Within the last five years, the DuPage County
Office of Homeland Security and Emergency Management has also increased
interoperable communications capacity throughout the County by:
• Obtaining and maintaining a cache of deployable tactical radios, available for first
responder agencies throughout the County.
• Enhancing the County's Illinois Transportable Emergency Communications System
(ITECS) Unit, coordinated through the IEMA, through a robust training curriculum
and holding regular Unit exercises.
• Maintaining the DuPage County Emergency Radio Network (DCERN) system.
• Maintaining a high-tech video conference system.
• Conducting monthly tests of all communications systems.
• Participating in committees and associations whose priorities include strategic
and interoperable communications, such as the:
o Emergency Telephone Safety Board (ETSB) Committee
o Public Safety Answering Points (PSAP) Supervisor Committee
o DuPage Police Chiefs Association
o DuPage Fire Chiefs Association
8.3 Recovery and Mitigation
Just as the federal government has a National Preparedness Goal, the FEMA has also
developed a framework for disaster recovery. The National Disaster Recovery Framework
defines recovery as a three-phase process, outlined within Exhibit 8-4 (FEMA, 2011, P. 8),
and provides recovery principles (Exhibit 8-3), success factors (Exhibit 8-3), roles and
responsibilities, and guidelines for leading a successful recovery process (FEMA, 2011, P.
13). While this process and the goals within may be seen differently based on a
community's "circumstances, challenges, recovery vision, and priorities" (FEMA, 2011, P.
13), there are common characteristics that each community shares throughout its
recovery process:
• "The community successfully overcomes the physical, emotional and
environmental impacts of the disaster.
• It reestablishes an economic and social base that instills confidence in the
community members and businesses regarding community viability.
• It rebuilds by integrating the functional needs of all residents and reducing its
vulnerability to all hazards facing it.
• The entire community demonstrates a capability to be prepared, responsive, and
resilient in dealing with the consequences of disasters"
(FEMA, 2011, P. 8).
Emergency Services 8-9 2018
Natural Hazard Mitigation Plan
Exhibit 8-3
National Disaster Recovery Framework Concepts
Recovery Core Principles Success Factors
Individual and Family Empowerment Effective Decision-Making and
Coordination
Leadership and Local Primacy Pre-
Disaster Recovery Planning Integration of Community Recovery
Planning Processes
Partnerships and Inclusiveness
Well-Managed Recovery
Public Information
Pro-Active Community Engagement,
Unity of Effort Public Participation and Public
Awareness
Timeliness and Flexibility
Well-Administered Financial Acquisition
Resilience and Sustainability
Organizational Flexibility
Psychological and Emotional Recovery •
Resilient Rebu ilding
Following a disaster, one of the ways th e OHSEM begins the process of coord inating
recovery is through the collection of damage assessment information. This can be don e
through "windshield" assessments, door-to-door canvassing, and the collection of
internet-based surveys. In addition to damaged buildings, the DuPage County EOC also
coll ects information on utility outages, transportation and communications interruptions,
and public health needs. This information is used to develop a "big picture " and a
prioritized recovery plan. In addition to providing assistance to res idents following a
disaster, the County also prioritizes business recovery, especially the recovery of small
businesses. The FEMA has concluded that approx imately 40% of businesses i n a
community w ill close following a d isaster, and approximately 25% will never re-open {The
Gazette, 2016, P. 1}. Most businesses that do re -open after a disaster will take several
months to do so {The Gazette, 2016, P. 1). Business closures can financially and
psychologically impact a community, leaving residents out of work, damaging local
economy, and sometimes slowing regional growth .
Emerg e ncy Service s 8-10 2018
N atu ra l Ha zard M itigation Pl an
lPRMHSASTU\
PR£PA11£DNl'.SS
E'.Jlll mple.s In clude:
Pre·d lsaster
L recovery p l anning
L• M1ti9atlo.n pl annfng
and Implementation
Commu nity
l capacity-a nd
res~l ente -but l dlng
-· Conc:Jucling d•saste1
l preparedness
e~cersfses
1. Partnershi p ll1.1lld lng
-ArtJcu laung
protocols In di saster
plans for !lervices Lo
m••r lhP f>mntlnn;,I
and health care
needs or a<Ju l ts llnd
c h1ldre11
Exhibit 8 -4
National Recovery Fra me work -Recovery Continuum
N.A.TIOkA L llf.SPONU
FRAM£WORK (HRf)
S-l lORT•TrRH RfCOVfRY l!.-ampl e.s ln,lud e:
-Ma!.s Care/Shelter1119
• Provide integrated mass care
Md emef9ency servlCei
. Debris
., Clear pnmarv lranspo11a l1on
routes
·• 8u$lne.ss
~ Establisn t emporary or
1n1er1m 1nrrastrutlurc to
support bu~1nl'.S..$ rcopc:nln9s
• R.ttstablish cash flaw
-EmoUonaVPsy'chologic~I
.. lo'ent•IV adults dnd ch1Jt1 ren
who bP.nef·I f1 om Cll l.lllS~J lng Or
bellavioral healtll se1vices ana
beoln treatment
-Publlc He<tllh and
Heal th Care
, rrovide eme19encv "fld
t emPQniry 111e01c.:i I tare ,wa
establish appropriate
surve•lar>ce protoc-ols
MitJ9 atlon Activi ties
.. As~e.ss a n d undurst3111J r isks
and ~uln erablll tles
l lff~RMfOIJITE RECOVERV
£xam1il•• Incl ude:
-Hous in g
·• Provi de accessible Interim
h0usln9 solutions
·Debris/Infrastructure
~ lrlltlatc ilcbrls 1emoval
d Plan lmmeaiat e
in frastrlicture repai r and
1·estnrat ion
.eusine$S
.. Support re~rablt>hm ctl l of
businesses where appropriate
• Support lhe e.stablish01ent of
busin(>S.S recovery oner-slop
centers
Emotlo11a l/Psych ol oglcal
• EnoaQe support netwo:)<s for
ttl"!!)f.'in? t;~n~
'Pub li c Heal th and
~lealth Cilre
.. t:Mure co ntinui ty or c~1 e
through tem porary tacilities
MitloaUon Ac:tlvllle!>
~ hi'orm comm•Jn itv rn~mbe1s
ol o pportunities to build bocl<
stronger
NlltlONA L 015AS l ll.A RfCOVf llY
f !l.Ul fWOA K (NORF)
LONG·TERM Rl:COVE!l¥ f~a m pll!• l11d11d "'
H·ouslng
·• Develop pl.'rrnanent nousing
so l uUons
•Infrast ruct ure
.., Robulld Infrastru cture to
meet fut ure community neetls
-Business
"l mple111ent i:conom rc
rev11~11 1nt1o n st1Atey1es
.., Fi"lllta\e funlllng to
business rcbu1 l dfn g
Err1ouo·na l/Psycho lo91ca 1
.. F•1llow·up for ongoi ri9
coun$tllng; b~li~vtor~I hea lth,
and case management
setvlce.s
Public Health and
Health Care
.. Ree.stablish ment or
disrupted health care fac1l1Hcs
I ,Ml t.lgatlon Activities
• I mpl ement m i ti gation
stra te91~s
The County and municipalities are continually active i n singl e and m ulti-jurisdictional
mitigation projects fo c used on life safety, publi c hea lt h, localized and major flood
reduction , infrastructure harden ing, and natural resource pres ervati on. Proj ects in c lud e
(DuPage County, 2017):
• Purchasin g repetitive loss properties and install ad di tion al water se we rs, storm
se we r main s, a nd c ulve rts t hroughout the County.
• Working to rehabilitate damage d and aging bridges around the Co u nty.
• Updatin g traffi c s ign a l so f tware and in stall ing unin te rruptable power supplies
(UPS) to alleviate congestion d uring power outages and enh a nce si gn a l
manage me nt capabilities during eva cuation scenar ios.
• Worki ng to increase flood storage within the com m un iti es alon g the East Branch
of th e Du Pa ge Riv er th at expe rience frequ ent flo odin g.
• Ret rofitti ng Fawe ll Dam to allow f or prope r wi ldlife migration .
• Extending current drinking water supplies to unin c orporated resid en ts.
• Re pa i r and re place aging sanitary sewer pipes, and update technology wi t hi n
wastewater treatme nt plan ts.
Emerge ncy Servi ce s 8-11 2018
Natural Hazard Mitigation Plan
8.4 Conclusions
1. Emergency management planning in the County is ongoing and generally
comprehensive.
2. Numerous mutual aid agreements are in place throughout the County.
3. Most communities within the County, in cluding County government, maintain an
Emergency Operations Center (EOC).
4. Adequate and comprehensive warning systems exist and are used throughout the
County.
5. Schools, hospitals, nursing homes, and government buildings have NOAA weather
radios.
6. Some emergency response plans do not cover all critical fac ilities that will be affected
by various types of hazards.
7. Many plans do not include adequate guidance on post-disaster inspect io ns and
capitalizing on post-disaster mitigation opportunities.
8.5 Recommendations
1. Continue to update Emergency Operations Plans for the County and municipalities
every two years with a NIMS compliant template.
2. Assessments and response procedures for floods and other hazards should be
incorporated in all emergency operations planning and response where
appropriate.
3. Emergency Operations Centers at the County and in municipalities should be
evaluated for effectiveness and functionality, and modified appropriately.
4. The County and municipalities should establish a continuity of operations plan for
emergency services, including establishing a secondary lo cation for their EOC.
5. Develop emergency transportation plans that allow for emergency coordination
and evacuation (routing).
6. The Mitigation Workgroup should continue to collaborate with other municipal and
County workgroups to coordinate the imp lementation of mitigation projects.
7. Conduct annua l emergency response training exercises . Look for multi-jurisdiction
training opportunities.
8. Provide training on NIMS and ICS for all first responders and other identified
personnel for compliance.
9. The County and municipalities should continue to coordinate the identification and
mapping of critical infrastructure to enhance emergency planning and response.
10. DuPage communities shou ld continue to strive to obtain or renew StormReady
certification.
Emergency Services 8-12 2018
Natural Hazard Mitigation Plan
References
DuPage County, Illinois. (2016, October 1). DuPage County Emergency Operations Plan
(EOP). Retrieved on: December 22, 2017.
DuPage County, Illinois. (2017). DuPage County 2017 Capital Improvement Plan.
Retrieved on: December 22, 2017 . Retrieved from:
https:// du page ca pita lpla n.com/a II-projects/
Federal Emergency Management Agency (FEMA). (2017a). National Preparedness Goal.
Retrieved on: December 20, 2017. Retrieved from:
https://www.fema.gov/national-preparedness-goal
Federal Emergency Management Agency (FEMA). (2017b). National Flood Insurance
Program Community Rating System Coordinator's Manual. Retrieved on:
December 7, 2017. Retrieved from: https://www.fema.gov/media-library-
data/14939054 77815-
d794671adeed5beab6a6304d8ba0b207 /633300 2017 CRS Coordinators Ma
nual 508.pdf
Federal Emergency Management Agency (FEMA). (2013). IS -247.A: Integrated Public
Alert and Warning System (/PAWS). Retrieved on: December 22, 2017. Retrieved
from: https:// em i lms. f ema.gov /IS24 7 a/index. htm
Federal Emergency Management Agency (FEMA). (2011). National Disaster Recovery
Framework. Retrieved on: December 22, 2017. Retrieved from:
https://www. f e ma .gov /pdf /recove ryf ra mework/n drf. pdf
The Gazette. (2016). 7 Shocking Disaster Recovery Stats for Small Business Owners.
Retrieved on: December 22, 2017. Retrieved from: http://gazette.com/7-
shocking-disaster-recovery-stats-for-small-business-owners/article/1590436
US Department of Homeland Security (OHS). (2017). Critical Infrastructure Sectors.
Retrieved on: December 22, 2017. Retr ieve d from: https://www.dhs.gov/critical-
i nfrastructu re-sectors
US Department of Commerce (DOC), National Oceanic and Atmospheric Administration
(NOAA) National Weather Service (NWS). (2017). NWS Stormready Program.
Retrieved on: December 22, 2017. Retrieved from:
https://www.weather.gov/sto rm ready/
US Department of Homeland Security (OHS). (2017a). Emergency Alert System (EAS).
Retrieved on: December 22, 2017. Retrieved from : https://www.ready.gov/alerts
US Department of Homeland Security (OHS). (2017b). Wireless Emergency Alerts (WEA).
Retrieved on: December 22, 2017. Retrieved from: https://www.ready.gov/alerts
US Department of Homeland Security (OHS). (2017c). NOAA Weather Radio All Hazards
(NWR). Retrieved on: December 22, 2017. Retrieved from:
https://www.ready.gov/alerts
US Department of Homeland Security (OHS). (2017d). Integrated Public Alert and
Warning System. Exhibit 7-2. Retrieved on: December 22, 2017. Retrieved from:
https://www.ready.gov/alerts
Emergency Services 8-13 2018
Natural Hazard Mitigation Plan
Chapter 9 -Public Information
Public inform ation activities "advise property owners, poten t ia l property owners, and
visitors about the hazards, ways to protect people and property from the hazards, and th e
na t ural and be neficial f unct ions" of natural hazards (FEMA, 2017, P. 510-20). A
successfu l hazard mitigation program in vo lves a public i nforma t ion strategy and i nvo lves
both the public and private sectors. Public information activities include (FEMA, 2017, P.
510-20):
• Map information
• Outreach Projects
• Real Estate Disclosure
• Libraries
• Tec hnical Ass istance
• Environmental Education
9.1 Public Information Program Strategy
Outreach projects are the first step in th e process of motivating residents and business
owners to take the steps necessary t o protect th emse lves and others . "Research has
show n that aware ness of the flood hazard is not enough t o motivate peop le to take action
to protect themselves and their property. People need to be told repeatedly, through
vario u s means, what specific a ctions t o take before they wil l change their behavior.
Research has a lso shown that a properly run l oca l information program is more effective
in bringing about change than are national advertising or publi city campaigns" (FEM A,
2017 , P. 330-2). The Federal Eme rgency Ma na gement Agency's (FEMA) Community
Rating System (CRS) suggests an outreach program shou ld:
• "Focus on their community's public information needs,
• Deci d e what their residents need to know most,
• And, what they want t hei r res idents to do with the i nformation they rece ive"
(FEMA, 2017, P. 330-2).
The Workgroup discussed pub l ic i nformation strategies a nd program deve lopment during
th e January 4, 2018 update meeting. Topi cs discussed are incorporated within the
recommendations section of this chapter, and are inclu ded within this Plan's Action Plan.
For more information on this, see Chapt ers 1 and 10.
DuPage Co unty a nd Community Out reach Projects: As mentioned within Chapter 8, the
DuPage County Office of Ho mela nd Secu rity and Emergency Managemen t (OHSEM)
regularly attends and hosts outreach events. In 2015, the OHSEM participated in 66
ou treach events, in 2016 it was 49, and in 2017 it was 29. While the focus of each event
ma y d iffer, the OHSEM's ove ra ll th e me includes makin g t he public more awa re of the
hazards they face and the options th ey have to make th e ir families and their comm unities
more res ilie nt. Additional outreach activities in clude:
• Tours of the County Emergency Operations Center (EOC) to stud ents studying
eme rge ncy manage ment and criminal justice at nearby colleges.
Public Inform ation 9-1 20 18
Natural Hazard Mitigation Plan
• Distributing weather radios in coordination with the City of Chicago as part of the
Regional Catastrophic Preparedness Grant Program.
• Collecting p ublic input on natural hazard mitiga t ion thro ugh public surveys.
• Coordinating and participating in televis io n and radio int erviews .
• Developing press releases in coordination with the County Board Office.
• Providing brochures and handouts to stakeho ld e rs, upon request.
Annually, the OHSEM hosts the Advanced Severe Weather Seminar. This event is geared
toward indiv idu als who will be on the fro nt lin e of the weather warning sys tem, in cludin g
spotters, amateur radio operators, emergency management perso nnel, police, fire,
educa tors, public works and utility workers. This severe weather seminar is designed to
provide co ntinuing education to trained spotters who wish to broaden their understanding
of advanced weather pheno mena. Anyone can become a trained spotter.
DuPage County Stormwater Management works with the School and Community
Assistance for Recycling and Composting Education (SCARCE) in Wheaton on physical
models of watershed runoff a n d groundwater flow that are brought into sc hools to
educa tion children. In addition , they regularly hold wetland educatio nal trainings.
In addition to in-pe rson outreach, the OHSEM also maintains an online presence through
its Protect DuPage website, and social media accounts such as Twi tter, lnstagram , and
Face book. The OHSEM utilizes the Illino is Eme rge ncy Management Agency (IEMA) and the
Illinoi s Department of Public Hea lth's (IDPH) monthly preparedness topics, customizin g
posts to s hare each month with followers. Municipalities are encouraged to share the
OHSEM's social media postin gs on their own webs ites, socia l media accounts, and within
local e le ctro n ic and paper newsletters.
Both the OHSEM and the DuPage County Department of Stormwater Management
maintain a portion of their webpages dedicated to sharing publications for re side nts to
become more educa t ed and prepared. The OHSEM regularly promotes the use of FEMA,
Illinois Emergency Management Agency (I EMA), and American Red Cros s brochures a nd
publications on saf ety measures to t ake for fires , flood s, winter storms, excessive heat,
etc. The American Red Cross' publications are tailored for different age groups. They also
host s pecia li zed p rograms on topics suc h as "home a lo n e sa fety," first aid and cardio-
pulmonary resuscitation s (CPR), and what to do during a disaster.
Th e OHSEM is developing a Community Outreach Plan that will incorporate all of the
outreach activities the office already regularly conducts, and identifies new methods and
themes the County can to engage the public.
9.2 Community Resources
A community's li brary, website, and municipal office are locations res id en ts often seek
info rmation from first. Local libra ri es can obtain books and pamphlets from Non-Profits,
the County, the State, and Fede ral agencies free of cha rge . Municipal websites, offices,
and newsletters are also great resou rc es for providing haza rd m itigation and
preparedness information to reside nts. The OHSEM provides informa tio n abo ut hazard
Public Informat ion 9-2 2018
Natural Hazarcf Mitigation Plan
mitigation on its Protect DuPage website, and DuPage County Stormwater Management
provides information on how to find and use floodplain maps on its website.
Municipalities are encouraged to provide links to these pages on their websites. Table 9-1
provides a summary of how each municipality communicates with their residents, specific
to natural hazards and mitigation. For more information on floodplain maps, see the
section on Hazard Mapping within Chapter 4.
Table 9-1
DuPage Local Community Resources
Hazard Hazard Information
Community Information in a on Community Assistance on Property visits Regular Reading Flood Maps
Newsletter Website
Villaae of Addison Yes Yes Yes Unknown
Citv of Aurora No Yes Unknown Unknown
Villaae of Bartlett Yes Yes Yes Unknown
Villaae of Bensenville No No Yes Unknown
Villaae of Bloominadale No No Unknown Unknown
Villaae of Burr Ridae No No Unknown Unknown
Villaae of Carol Stream Yes Yes Yes Yes
Villaae of Clarendon Hills No No Unknown Unknown
Citv of Darien No No Unknown Unknown
Villaae of Downers Grove No Yes Yes Unknown
Citv of Elmhurst No No Unknown Unknown
Villaae of Glendale Heiahts No Yes Yes Unknown
Villaae of Glen Ellvn No No Unknown Unknown
Villaae of Hanover Park No No Unknown Unknown
Villaae of Hinsdale No Yes Yes Yes
Villaae of Itasca No Yes Unknown Unknown
Villaae of Lisle Yes Yes Yes Yes
Villaae of Lombard No Yes Unknown Unknown
Citv of Naperville No No Unknown Unknown
Villaae of Oak Brook No Yes Yes Unknown
Citv of Oakbrook Terrace No No Unknown Unknown
Villaae of Roselle Yes No Unknown Unknown
Villaae of Villa Park No Yes Yes Yes
Citv of Warrenville No Yes Yes Yes
Villaae of Wavne No No Unknown Unknown
Citv of West Chicaao No No Unknown Unknown
Villaae of Westmont No Yes Unknown Unknown
Citv of Wheaton No Yes Yes Yes
Villaae of Willowbrook No No Unknown Unknown
Villaae of Winfield No Yes Yes Yes
Citv of Wood Dale No Yes Unknown Unknown
Villaae of Woodridae No No Unknown Unknown
DuPaae Countv No Yes Yes Unknown
Technical Assistance: In addition to providing links to floodplain maps and hazard
mitigation materials, communities may provide assistance such as interpreting hard to
understand materials and maps, and submitting requests for map amendments and
revisions when a resident has evidence their property should not be included within the
mapped floodplain. Local building department staffs are experts in construction; some
communities may provide free advice to residents regarding retrofitting and other
protective measures. Examples of these activities may include:
• Recommending or identifying qualified or licensed contractors.
• Inspecting homes for anchoring of roofing and the home to the foundation.
Public Information 9-3 2018
Natural Hazard Mitigation Plan
• Providing advice on protecting windows and garage doors from high winds.
• Providing advice on protecting homes from flooding through mitigation
activities such as: re-grading, window well barriers, down spout extensions, etc.
• Explaining when building permits are needed for home improvements.
Table 9-1 shows communities that provide at least one of the techn ical assistance
options mentioned above.
9.3 Real Estate Disclosure
When purchasing or re nting property, whether it be a home or a business location, it is
common for residents to be unaware of the hazards that property is exposed to. Whether
it is a flood or a tornado, residents often communicate following a disaster that they wish
they would have known more about natural hazards so they could have taken extra steps
to be prepared. Both federal and state laws exist regarding real estate disclosure, helping
to protect potential buyers and increase awareness of hazards.
Federally, potential sellers must abide by the Residential Lead -Based Paint Ha zard
Reduction Act of 1992 (U.S. Environmental Protection Agency, 1992). In addition,
regulated lending institutions must advise applicants for a mortgage or other loan if a
property is in a floodpla in, as shown on the Flood Insurance Rate Map. Flood insurance is
required for buildings located with in the base floodplain if the mortgage or loan is
federally insured.
In Illinois, the Residential Real Property Disclosure Act (Illinois General Assembly, 1994,
P. 4-5) requires sellers to report if their property has any identified issues as outlined
within 23 categories. A list of these categories can be found within Exh ibit 9-1 (Illinois
Association of Realtors, 2015, P. 1). However, it is important to note that this State law
relies on the seller being aware of a problem and complying with the State's laws. A
property owner may legitimately not be aware of potential flooding problems with a
property being sold or purchased . Therefore, it is important for potential real estate
buyers to do their homework before purchasing a property. For more information on the
resources available to potential buyers, see the Technical Assistance section within this
Chapter. In addition, Illinois Statute also requires that a subdivision map and/or plat
must, include whether any part of the area "is located within a special flood hazard area
as identified by the Federal Emergency Management Agency (FEMA)" (Illinois General
Assembly 1996).
Publ ic Information 9-4 2018
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YES NO NIA
Natural Hazard Mitigation Plan
Exhibi t 9-1
Ill inois Residentia l Rea l Property Disclosure Act Requirem e nts
Sella h:L\ oc.:uplcll the property within lhc laM 12 months . I No c.\planu tirm is oce<l<'tl.)
I ur11 uwun: of lloo<ling or n:cu rring kakugc pmbkm~ in the nawlspun: or base ment.
I :u11 uwnrc thfil the proJl<!rty is locu tcll i11 n ll ood plain or th:.1t I c urrent ly ha \·c ll a<l<I hll1a rJ insura 111:c 011 thc prnpcrty.
I :1111 aware of 11101criill lkfc.::1s in the ba.~c rnc nt or fou11 J n1i11n (ind11Jing cracks an<l hulgcs ).
I um ;1wurc o f lt'ilk~ or lll Mtc ri al 1kkcts in the nl<)f. cci lin ~~ or l'hi mncy.
I 11111 uwun: or 111nr.:rial <ldc.:ts in the walls, wi111l1)11 ~. d11\1rs or lloor...
I um uwan: nf 111ah:rfo l dd'c:•L~ in the dcctrkal systc111 .
I um aware of mati:ri:ll 1lcfoc1s in the plumbi ug syst.::111 (includes suc h thiug ~ as wm,•r heater . su mp pump. w~h:r trcau11cnt
syste m. sp rinkler sysh:m, und swinu ning pool 1.
I u111 uwurc of mutcilol J cfc.:ts in lh l.' W<·ll ur well c<1uipmcnt.
I Ulll llW lllC or 1111,\;tfC c1111Jitio11s in the drinking wutc r.
I urn uw:t1c <)f m11tcri al 1k foc1s in lh c IH:atin~. :iir conJi tio11111g. or w111iln1ing s)·stcms .
I um uwaic of muh:riul J c l'ccts in lhc iircpl:l\'C or wooJburning s1ovc.
I um 11wun: of mu lcri ll l tickets In ll1 c scplic, )ll nitury ~.:w.:r. or ot her <li>po.1a l ~y.~t cm .
I 11111 aware of 1111s;1fo ~0111:c 111ra1lo11 ~ or r:1Jon 0111hi: pri:111ist~.
I am uw;11c ol' 1111.~~rc l'nn.:cntrutions of ur unsMc cnmliri o o ~ rcla1ing 10 11.•~slO~ on the pr.:111is..·).
I 11111 uwan: or uri>Mc cnncc ntroti on) of ur un~m f.: ..:1>11J i1io ns rclatin g 111 lcuJ pai nt , kuJ wa ler pi pe~. lc:ul plumhi ng pipes or
lc ml in the soil 0111hc pn:mi scs .
I 11111 uwon: of min e sub)i tkm:c, 11ndcrgrl1u111J pit.'i, sc ttle111.:nt •. ,lidini;, uplw avo l. nr oth er ca11 h )tahi li1y llcf.:c ts on th e prc111bc:..
I 1111111w :~rc nf current l11fcst:1 ti on) of 1cr111itc., 011)thcr woo<I bMinti iH.ll'\'t~.
I urn uwnrc of n s.tnr.:tunl l d..:li:•t 1·m1sctl by previl>11s i11fc st.1li01l'i or trnnitcs or •llhcr wood borhrg in~.:c t s .
I 11111 uwnrc of 1Jll(kt'gm11111I rud stomg.: t1111b nn th.: prope rt y.
I 1111111\\'llrC or ho und tlry or lut lilll'· dlspul cS .
I l u1V1: r~.:dw1l 110tkc of viul111i1111of 111.:ri l. ~ll1tc 111 k1kral hi\\·> nr r c~u la liOll~ rclutlne: lo th is prupcrty. 1\'h k h 1·io l;llii111 h it~
not hci::n i:nrrc.:tcll .
I 1111\ h\1 :\fl! 11r .. 11hl s pr1lfl''ll )• ""' bc~r i ll SCll f1 \r 11 11: llllll11i f11,•111rc .,f 111dh ;1 111plr ~hlnlirk Ii~ dd1ikJ lr1 s~..:l i1>11 Ill Ill' lhc
M c th 11111plic 1 u111i11~ C1111 lrol 1111d ('u11111111nit)' l'rnlc.:tio n A~t.
9.4 Conclu s ion s
1. The Coun ty and many m unicipa lit ies commun icate natura l hazard and m itigation
information to residents throughout the year.
2. The Co u nty is estab li sh i ng a public outreach program which encourages municipa l
invo lvement.
3. The Co u nty and DuPage municipa li t ie s are successfu lly coordi nating the update of
floodp lai n maps.
4. The most efficient ways t o commun icate with residents are :
• Outreach Events
• Commun ity News letters
• Webs ites and l inks to other sources
• Social Med ia
9.5 Recommendation s
1. The County and munici pa l ities whom adopt th is plan sho u ld develop and agree upon a
common public outreach program , to be updated annua lly. T his outreach program cou ld
inc lude:
• A coordinated socia l med ia campaign.
Pub lic Information 9-5 2018
Natural Hazard Mitigation Plan
• A review of publications from other agencies, and a cooperative agreement to
promote and distribute similar publications to distribute to residents.
• The promot io n of natura l hazard mit igation w ithin community newsletters across
the County.
2. The County and communities should provide an order form for local libraries to order
free state and f ederal hazard m itigation publications.
3. The County and communities should coordinate with private organizations to promote
natural hazard informat io n to emp loyees and customers.
4. Communities i n t he Na ti o na l Fl ood Insurance Program should provide fl ood pl a in
information for property ow ne rs.
Public I nformation 9--6 2018
Natural Hazard Mitigation Plan
References
Federal Emergency Management Agency (FEMA). (2017). National Flood Insurance
Program Community Rating System Coordinator's Manual. Retrieved on:
December 7, 2017. Retrieved from: https://www.fema .gov/m ed ia-library-
da~/1493905477815-
d794671adeed5beab6a6304d8ba0b207 /633300 2017 CRS Coordinators Ma
nual 508.pdf
Illinois Association of Realtors. (2015, January). Illinois Association of REALTORS®
RESIDENTIAL REAL PROPERTY DISCLOSURE REPORT. Retrieved on: December
26, 2017. Retrieved from:
http://www.illinoisrealtor.org/sites/illinoisrealtor.org/files/Forms/108 2.pdf
Illinois General Assembly. (1994). (765 ILCS 77/) Residential Real Property Disclosure
Act. Retrieved on: December 26, 2017. Retrieved from:
http://www.ilga.gov/legislation/ilcs/ilcs5 .asp?Actl0=2152&ChapterlD =62
Illinoi s General Assembly. (1996). 55 ILCS 5/3-5 029. Retrieved on: December 26, 2017.
Retrieved from: http://ilga.gov/legislation/ilcs/documents/005500050K3-
5029.htm
U.S. Environmenta l Protection Agency. (1992). Residential Lead-Based Paint Hazard
Re duction Act of 1992--Title X. Retrieved on: December 26, 2017. Retrieved from:
https:// www .e pa. gov /lead/reside ntia I-lead-based-paint-hazard-reduction -act-
1992-title-x
Public Information 9-7 2018
Natural Hazard Mitigation Plan
Chapter 10 -Action Plan
The findings, conclusions, and recommendations presented in Chapters 1 through 9 of the
DuPage County Natural Hazard Mitigation Plan have been collated into this Action Plan. In
addition, the guidelines and goals developed by the Workgroup, and presented in Chapter 3,
set the context for these Action Items. The following Action Items align with the six mitigation
areas outlined by the Federal Emergency Management Agency (FEMA) within their
Community Rating System (CRS) Program. The Action Plan presented in this chapter
establishes an overall direction for the County regarding natural hazard mitigation. The
Action Plan can be considered the most important part of this Plan as it incorporates an
awareness of local risks, resources, needs, and plans a path forward.
Action Items: The Workgroup met to discuss mitigation activities and develop a draft action
plan on January 4, 2018. The action items discussed within the meeting were collated by
the DuPage County Office of Homeland Security and Emergency Management (OHSEM).
Thirteen action items were established as a result:
Action Item 1: Establish Sub-Workgroups within the Mitigation Workgroup
Action Item 2: Enhance Public Participation in Mitigation Workgroup
Action Item 3: National Weather Service StormReady Participation
Action Item 4: Critical Infrastructure Identification and Verification
Action Item 5: Critical Facility Back-Up Generation Assessment
Action Item 6: Adopt County-Wide Public Outreach Month ly Topics
Action Item 7: Flood Control and Property Protection Projects
Action Item 8: Improve Building Code Ratings
Action Item 9: Incorporate Mitigation Concepts into Future Planning
Action Item 10: Participate in Tree City USA
Action Item 11: Participate in Community Rating System (CRS) Program
Action Item 12: Participate and Support Floodplain Management Studies
Each Action Item within this Action Plan describes who is responsible for implementing each
mitigation measure, an estimate of cost of implementation, and the benefits of
implementing each action item. The Action Plan took into consideration the countywide
coordination that takes place through the Stormwater Ordinance Administrator's Workgroup,
the DuPage County Public Works Directors Working Group, and the Local Emergency
Management Coordinators Group.
It should be noted that this Plan serves only to recommend mitigation measures.
Implementation of these recommendations depends on adoption of this Plan by the DuPage
County Board and the city council or board of trustees of each participating municipality. It
also depends on the cooperation and support of the offices designated as responsible for
each action item. In addition, each community was encouraged to include additional
community specific goals and action items. Products that were provided to the County prior
to the draft submittal are included within Appendix E.
Action Plan 10-1 2018
'·•
Natural Hazard Mitigation Plan
A summary of the previous plan's action items through the final annual report, along with
the mitigation activities communities completed to achieve each action item, can be found
within Appendix F.
10.1 Plan Maintenance
The Natural Hazard Mitigation Workgroup should continue to develop an annual report to
formally summarize the hazard mitigation activities of DuPage County and its communities,
specifically focusing on progress towards each action item within the Natural Hazard
Mitigation Plan. The Workgroup shall also meet annually to discuss the report's findings,
progress each community has made, issues each community has experienced, and
proposed projects. The annual meeting shall also give Workgroup members the opportunity
to discuss needed revisions/amendments to this Plan.
Developing an annual report and meeting annually to discuss progress keeps the Workgroup
involved in the plan maintenance process, formalizes the maintenance process, and
provides a level of accountability to work towards accomplishing the action items within the
Plan. DuPage County departments and staff assigned to the Workgroup shall be responsible
for coordinating and overseeing the development of the annual report and its associated
meeting. DuPage County coordination shall be overseen by the OHSEM. In addition, to
continue to encourage community participation, annual meetings shall be open to the public
and a public comment period shall be incorporated into each meeting.
Per the Federal Emergency Management Agency (FEMA), this Plan shall be updated every 5
years. Aga in, DuPage County departments and staff assigned to the Workgroup shall be
responsible for coordinating and overseeing the next plan update. DuPage County
coordination shall be overseen by the OHSEM. Action Items 1 (Establish Sub-Workgroups
within the Mitigation Workgroup) and 2 (Enhance Public Participation in Mitigation
Workgroup) focus on strengthening the Workgroup so it is better prepared to conduct the
next update. In addition, it is recommended that the next 5-year update be conducted over
the process of one to two years. This will provide the sub-workgroups ample time meet,
develop drafts, involve the public, coordinate with stakeholders, and finalize the plan.
Action Plan 10-2 2018
Natural Hazard Mitigation Plan
10.2 Action Items
Action Item 1: Establish Sub-Workgroups within the Mitigation Workgroup
Action Item Description: The Natural Hazard Mitigation Workgroup should establish quarterly
sub-workgroup meetings, based on subject matter expertise, to oversee the plan maintenance
and update process.
Responsible Agency: All County and municipal participating agencies.
Cost: There should be a minimal cost associated with this action item. The primary cost would
be additional staff time designated to allow Workgroup participants to attend sub-workgroup
meetings.
Benefits: Developing sub-workgroups to oversee the plan maintenance and update process will
increase the Workgroup participation, build and enhance relationships, enhance the output
from this plan, and improve plan content by ensuring subject matter experts have the proper
influence.
Action Item 2: Enhance Public Participation in Mitigation Workgroup
Action Item Description: The Natural Hazard Mitigation Workgroup membership should be
enhanced to incorporate representatives of the public (i.e. residents) and private stakeholders.
Responsible Agency: County departments shall lead this effort.
Cost: There should be minimal cost associated with this action item. The primary cost for this
item would be staff time associated with recruiting public and private stakeholders.
Benefits: Including representatives of the public (i.e. residents) and private industry would both
broaden the plan 's perspective, build and enhance relationships, and provide additional
Community Rating System (CRS) points to municipalities that participate and adopt the plan.
Action Plan 10-3 2018
Natural Ha zard Mitigation Plan
Action Item 3: National Weather Service StormReady Participation
Action Item Description: DuPage County communities should participate in the National
Weather Service StormReady program.
Cost: There is no cost to become a StormReady community, however communities may need to
update their emergency preparedness infrastructure to quality and a community will need to
allocate a small amount of staff time to complete the application and fulfill any site visits. It is
estimated the total amount of hours it would take a community to complete or update an
application is between five to 10 hours. In addition, a sign that states a community is
Storm Ready certified is less than $50.
Benefits: In addition to ensuring a community has up-to-date warning systems, which can
prevent injuries and save lives, Storm Ready certification has the potential to enhance a
community's Community Rating System (CRS) rating.
Responsible Agency: County and Municipal emergency management agency.
Action Item 4: Critical Infrastructure Identification and Verification
Action Item Description: DuPage County communities should verify aspects of the 16 Critical
Infrastructure Sectors within their jurisdiction and share findings with the County to identify
mitigation opportunities, to include advanced warning systems.
Responsible Agency: County and Municipal emergency management agencies, public works
departments, storm water administrators, and engineers.
Cost: The total cost of this action item is highly dependent on the community. The primary cost
associated with this action item is the staff time that will be required. Communities that have a
greater awareness of the infrastructure within their community will have an easier time verifying
all of the 16 sectors.
Benefits: Identifying critical infrastructure and the hazards each may face will enhance a
community's capability to complete a comprehensive threat and hazard identification process.
In addition, allowing the County to compile data from all communities will enable the County as
a whole to develop a more in -depth community profile, and could potentially enhance a
common operating picture during incident response. When a community is aware of its critical
infrastructure, and the potential hazards it can face, all aspects of planning becomes easier (i.e.
hazard mitigation, financial and strategic, project cost-sharing, etc.).
Action Plan 10-4 2018
. ~·
'
Natural Hazard Mitigation Plan
Action Item 5: Critical Facility Back-Up Generation Assessment
Action Item Description: DuPage County communities should identify backup generation
capabilities and ensure facilities meet minimum emergency power requirements of current
code.
Responsible Agency: County and Municipal emergency management agencies, public works
departments, storm water administrators, and engineers.
Cost: The total cost of this action item is highly dependent on the community. The primary cost
associated with this action item is the staff time that will be required. Communities that have a
greater awareness of th e critical facilities within their community will have an easier time
verifying back-up generation capabilities.
Benefits: Ensuring critical facilities have adequate back-up generation capabilities, including
automatic switchover, and heatjair capabilities, helps to reduce potential life safety and public
health issues. The benefits of using back-up generation may include preventing an evacuation
of a facility and allowing government services to continue.
Action Item 6: Adopt County-Wide Public Outreach Monthly Topics
Action Item Description: DuPage County communities should adopt the Illinois Emergency
Management Agency's (/EMA) Monthly Preparedness Topics.
Responsible Agency: County and Municipal public information offices/ officers.
Cost: No cost should be associated with this action item.
Benefits: Having all communities share the same themed information to residents will serve as
a force multiplier within the region, increasing public awareness and resiliency, and aligning
County government through a "one voice" approach.
Action Item 7: Flood Control and Property Protection Projects
Action Item Description: DuPage County and its communities should continue to partner on
flood control -both structural and green infrastructure -and property protection projects.
Responsible Agency: County and Municipal stormwater administrators, community planners,
and building and zoning officials.
Cost: The costs associated with this action item will be community and project specific.
Benefits: Flood control and property protection projects can benefit multiple communities by
targeting the source of a problem. Enhanced project participation will increase overall benefits
(i.e. cost-sharing, resources, etc.).
Action Plan 10-5 2018
Natural Hazard Mitigation Plan
Action Item 8: Improve Building Code Ratings
Action Item Description: DuPage County communities should seek to improve their Building
Code Effectiveness Grading Schedule (BCEGS) rating.
Responsible Agency: County and municipal building and zoning departments.
Cost: The costs associated with this action item will be community and project specific.
Benefits: Improved building codes can reduce an existing buildings' vulnerability to natural
h azards, ens ure future developments will not b e hinde red by h azards, reduce potential public
health and life sa fety issues, and enhance the overall we lfare of a community.
Action Item 9: Incorporate Mitigation Concepts into Future Planning
Action Item Description: DuPage County and its communities should incorporate hazard
mitigation and climate change concepts into updated codes, ordinances, comprehensive plans,
strategic initiatives, and capital improvement plans.
Responsible Agency: County and Municipal emergency management agencies, public works
departments, storm water administrators, and engineers.
Cost: The costs associated with this action item will be community and project specific.
Benefits: Including hazard mitigation and climate change concepts into future planning efforts
ensures these concepts will remain at the forefront of a community's activities.
Action Item 10: Participate in Tree City USA
Ac tion Item Description: DuPage County communities should participate in the Arbor Day
Foundation's Tree City USA program.
Re sp onsible Agency: County and municipal environmental departments.
Cost: Participating in this program will cost a community at minimum $2 per capita, plus staff
time to apply for and coordinate the program.
Benefits: Participating in Tree City USA will enhance the County's natural resource protection
capabilities, improve air quality, reduce costs for natural resource protection and other
associated projects, improve property values, and reduce energy costs.
Action P lan 10-6 2018
Natural Hazard Mitigation Plan
Action Item 11: Participate in Community Rating System (CRS) Program
Action Item Description: DuPage County communities should participate in the Federal
Emergency Management Agency's Community Rating System.
Responsible Agency: County and Municipal departments designated for land use and floodplain
planning.
Cost: Participating in the Community Rating System program is free. However, costs may be
associated with implementing credible activities and staff time for applying and maintaining
program status.
Benefits: Participating in the Community Rating System (CRS) program can maintain a
community's good standing in the National Floodplain Insurance Program (NFIP), can lower
resident's insurance premiums, reduce life safety and public health issues, and reduce a
community's vulnerability to hazards.
Action Item 12: Participate and Support Floodplain Management Studies
Action Item Description: DuPage County and its communities should continue to support
floodplain management studies, and review and update watershed plans.
Responsible Agency: County and Municipal stormwater administrators, engineers, and public
works departments.
Cost: The costs associated with this action item will be community and project specific.
Benefits: Conducting thorough studies allows for the development of in-depth plans and
hazard mitigation projects, reducing life safety and public health issues, and protecting
property and critical infrastructure.
Action Plan 10-7 2018
Natural Hazard Mitigation Plan
Appendix A -Workgroup Participants
J. Rogers Du Page County Emergency Management Coordinator OHSE M
K. Thomas DuPage County Emergency Management Specialist OHSEM
D. Adler DuPage County Emergency Management Coordinator OHS EM
S.Hunn DuPage County Chief Project Engineer Stormwater Management
M. Mitros DuPage County Stormwater Outreach Coordinator Stormwater Man agement
C. Heffler DuPage County Storrnwater Perm itting Manager Stonnwater Management
G. Ph illips DuPage County Project Manager Public Works
P. Hoss DuPage County Planning and Zoning Admin. Coord . Bu ilding & Zoning
J. Stran DuPage County Build ing and Zon ing Manager Building & Zon ing
J. Maranowicz Vi llage of Addison Deputy Chief Po l ice/EMA
R. Selv ik Village of Addison Detective Commander Po lice/EMA
J. Berley Vi llage of Addison Assistant Village Manager/Director Community Development
J. M el in Vi llage of Addi son Civ il Engineer II Commun ity Development
K .Liu Village of Addison Civil Enginee r II Community Development
R. Federighi Vi llage of Add ison Director Pu bl ic Works
J. Jones City of Aurora Emergency Managem ent Coordinator EMA
K. Schroth City of Aurora Director Publ ic Works
M. McGuigan Village of Bartl ett Police Commander EMA
B. Goralski Village of Bartl ett Assistant Building Director Building Department
D. Dinges Village of Bartlett Director Public Works
D. Rosenwinkel Vi llage of Bensenville Assistant Coordinator EMA
D. Schultz Vi llage of Bensenville EMA Coordinator EMA
J. Caracci Vi llage of Bensenville Director Public Works
K. Katz Village of Bensenville Ass istant t o Director Public Works
F. Giammarese Vi llage of Bloomingda le Chief Fire/EMA
A. Machek Vi llage of Bloomingdale Sergeant Pol ice/EMA
R. Prohaska Village of Bloomingdale Village Engineer Engineering/Building and Zoning
J. Monkemeyer Vi llage of Bloomingdale Director Public Works
M. Marchi Village of Bloomingdale Director Vi llage Services
M. Loftus Village of Burr Ridge Deputy Chief Police/EMA
D. Preissig Village of Burr Ridge Director/Village Engineer Publ ic Works
B.Hoff Village of Carol Stream Chief Fire/EMA
R. Schu ltz Village of Carol Stream Deputy Chief Fire/EMA
J. Jungers Village of Carol Stream Patrol Commander Po l ice/EMA
G. Ul reich Village of Carol Stream Stormwater Adm i nistrator Storm water
P. Modaff Village of Carol Stream Director Publ ic Works
B.Leahy Village of Clarendon Hills Chief Fire/EMA
D. Ungerl eider Vi llage of Clarendon Hills Director Community Development
M. Millette Vi llage of Clarendon Hills Director Public Works
G. Piccol i City of Darien Operations Commander Po lice/EMA
S. Manning City of Darien Senior Planner Community Development
D. Gombac Ci t y of Darien Director Village Services
K. Behr Vi llage of Downers Grove Stormwater Admin./Devel. Engineer Stormwater
J . Lomax Vi llage of Downers Grove Stormwater Administrator Stormwater
N. Newlon Vi llage of Downers Grove Director Publ ic Works
K. Johnson City of Elmhurst City Engineer Public Works
H. Killian City of Elmhurst Director Public Works
D. Novak Ci t y of Elmhurst ESDA Coordinator EMA
J. Sulak Village of Gl enda le He ights Police Officer Po lice/EMA
J. Ka lchbren ner Village of Glen dale Heights Director Community Development
R. Kapl an Village of Glendale Heights Director Publ ic Works
R. Acton Village of Glen Ellyn Deputy Chief Poli ce/EMA
D. Buckley Village of Glen Ellyn Assistant Director Publ ic Works
R.Daubert Vi llage of Glen Ellyn Professiona l Engineer Public Works
J. Hansen Vi llage of Glen Ellyn Director Pub l ic Works
A. Johnson Vi llage of Hanover Park Deputy Chief Police/EMA
M. Menough Vi llage of Hanover Park Chief Po li ce/EMA
Append ix A A-1 20 18
Natural Hazard Mitigation Plan
A. Sikich Village of Hanover Park Assistant Director Publ ic Works
K . Votava Vi llage of Hinsda le Captain Fire/EMA
D. Deeter Village of Hinsdale Village Engineer Public Services/Engineering
G. Peluso Village of Hinsdale Director Public Services
R. O'Connor Village of Itasca Director Police/EMA
N. Hill Village of Itasca Director Community Development
R. Hitchcock Vi llage of Itasca Direct or Public Works
D. Canik Vi II age of Li sl e Sergeant Po lice/EMA
M. Sucoe Village of Lisle Stormwater Admin Stormwater
J . Eli as Village of Li sle Director Publ ic Works
R. Sander Village of Lom bard Chief Fire/EMA
B. Stuart Village of Lombard Battalion Chief Fire/EMA
J. Bryant Village of Lombard Stormwater Administrator Storrnwater
C. Goldsmith Village of Lo mbard Director Publ ic Works
D. Nelson City of Napervi lle Emergency Management Coord. EMA
W. Novack City of Napervil le Director/City Engineer Transportation
D. Dublin ski City of Naperville Director Public Works
J. Cates Village of Oak Brook Deputy Chief Pol ice/EMA
R. Va lent Village of Oak Brook Superintendent Public Works
T. Budzikowski Village of Oak Brook Director Community Development
D. Patchin Village of Oak Brook Director Public Works
C. Calvello City of Oakbrook Terrace Chief Po lice/EMA
D. Lyn ch City of Oakbrook Terrace Stormwater Administrator Stormwater
D. Anderson Village of Rosel le Chief Fire/EMA
V. Ramirez Village of Roselle Director Public Works
R. Rakosnik Village of Villa Park Chief Fire/EMA
V. Juskelis Village of Villa Park Direct or Publi c Works
R. Salerno Village of Villa Park Deputy Director Public Works
J. Lukowicz Village of Villa Park Assistant Village Engineer Public Wo rks
C. Wiencek City of Warrenville EMA Coordinator EMA
J. Clark City of Warrenville Supervisor Public Works
K. Hocking City of Warrenville Senior Civil Engineer Community Development
P. Kuchler City of Warrenville Deputy Director Public Works
J . Naydenoff Vi II age of Wayne Chief Po l ice/EMA
D. Lynch Village of Wayne Contractor Stormwater
R. Peterson City of West Chicago Sergeant Police/EMA
W. Ganek City of West Chicago Director Community Development
R. Flatter City of West Chicago Director Public Works
E. Samuel City of West Chicago Detective Police/EMA
D. Lincoln Village of Westmont EMA Coordinator Police/EMA
D. Weiss Village of Westmont Ch ief Fire/EMA
N. Noriega Village of Westmont Assistant Director Public Works
M. Ramsey Village of Westmont Director Public Works
B. Schultz City of Wheaton Chief Fire/EMA
P. Redman City of Wheaton Director Engineering
V.Laoang City of Wheaton Director Public Works
R. Schalle Village of Willowbrook Chief Po l ice/EMA
T. Halik Village of Willowbrook Director Municipa l Services
F. Vollmer Village of Winfield Patro l Sergea nt Po l ice/EMA
P. Krumins Village of Winfield Planning Development Coord. Community Development
T. Loomis Village of Winfi eld Superintendent Public Works
c. Cel ia City of Wood Dale Police Support Services Mang. Police/EMA
M. Rivas City of Wood Dale Deputy Chief Police/EMA
M. York City of Wood Dale Director Public Works
K. Ostarello Village of Woodridge De puty Chief Police/EMA
R. Myers Village of Woodridge Civil Engineer Public Works
C. Bethel Village of Woodridge Director Public Work
Appendix A A-2 2018
Natural Hazards Mitigation Plan
Appendix B -Public Involvement Activities
Be l ow are samples of public information and public involvemen t activities that were used
during the development of the DuPage County Natural Hazard Mitigation Plan, inc luding:
• Press Releases
• DuPage County Website Content
• Social Media Announcements
•
Protect DuPage
Pub:rsh ed bl/ lw•i!er f?I Nc.v&mDH 2£r al 7 ·5·~arn 41'1
We ·~re reque·sting resiqents' input on dlsast~r preparedness and the
hazards our commu.nities face. Please complete a brief anonymous survey
PY Jan. 4, 2018 '. https;i /t.cot6dWhGLYXi.
@DuPageCounty @LoveBlueDuPage https://t.co /lsl<sDNZcZO
DuPage County OHSEivl on Twitter
We are reques ting residents' input on di saster preparedness and the t1azards our
communi ties face. Please comp!ete a brief anonymous survey by Jan .. 4. 2013:
https:/lt.co/6d\NhGLYXi. @DuP.ageCoun t~ @LoveBlueDuPage··
TWITTER.C OM
...
a 313 7 peop~e reached •=M+nm•
.~ . ~
Whars Happen ing in Wego
City of West Chicago Government
Adrian Marquez
3 Shares
Appendix B
Share
8-1 2018
Appendix B
Natural Hazards Mitigation Plan
-Protect DuPage
-t·Jl)vernber 29 , 2017 ""
We ~re requesting residents' inp1.,1t ~n di$aster prep;;iredn.ess and the
hazards our communmes face. Please complete a brief anonymous survey
by Jan . 4, 2016: https:J/form.jotform.comf73244873073 156.
DuPage County 8-0ard
Love Blue uve .µre~n
,. Like •Comment
B-2 2018
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Appendix B 8-3 2018
Appendix B
Natural Hazards Mitigation Plan
DuPage County OHSEM 0 @ProtectDuPage Jan 2 v
QuPage OHSEM hosts public meeting on N?tural Haiard M it igation Plan ·from 1-2
p.m. (Tht1rs .. Jan. 4).. View· the attach ed press re lea se and below links.
-Draft Plan Sunirnary: 9 00.g l/QdjCLW
-Draft Plan: goo .g l/SK b.sT Q
-Pu_b li\: Comment: goo,gl/zbZS 1 W
0
DU PAGE COl"NT\.
NEWS RELEASE
421 N, CQll;tlt)' Fann 1toad • \Vheaton, lllinoi s.60 18 ? • 6j0-l07-6;060
W~$k e: 'ft"llW.oL.:igco,CPG • l•h~r. @.~unn· • Factbo<>k: DuPa ge Cow.tty Boo.rd
Iwmedi3te re tea~
t;>~embft" 29, 1<117
Ccintaet Szbrt Abbai1
(630} 40 '-2936
DuPage County Hosts Public ~leettilg on
Natm·a1 Hazard M.ittga.tfon Plan
Wbeatoo, Il. -The DuPage C.onnty Office of Hom el.and Sei::unty and Emergency MaruEeinent wiU
hOlit a pubh i: m~eti~ reiu.ding a cou.ntywide NatucaJ H.azard_Mi.tiiation Plan from I p.n1 to 2 p1n.
on Thl;lnday. l!1WoU}' !! ·w tbe County Board Room 1t d\e JTK Admin\~tio11 ~tiildin& 421 N.
Coll(lty fl!J'm Rd, WheitlOt>.
lb.~ ~atutal Hµ.u<:\ Miugatton Pl!u ht'lps ce<l,111ll\li:U!)' 1udm e\'al!.l!tc:~d .recoguiz~ the tvpes. o~
naiurat h.aiat& that irupaet DuPagi? Coonty. Duriug the .pl~g" proc~, oonii:iiµnitle$ wiil work
t~getnff to eSUbti$h goals and de\;elop lltrate!1ei to reduce the long-term'eftecu of natural haZa"r&.
fer more \nformation ll'ooU1 tlir. D'lll'llse CQutrt;· Offic:t of'Hoouland S eturity and Emergency
T\h~ge1n~1, ill clud!.ng th~ Natur~I Hl%asd ~frt.iiati bu Pl;m, plm~ \illit \}"\\-w.Fro t tt-tDuPa&·~.ot-g .
Ll. 3 0 2
B-4 2018
City of Wa.rrenville
Government 0
@CilyOfWarrenv illa
Home
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City of West Chicago
@WestCh1ca gol L
Natural Hazards Mitigation Plan
1• L i ke ..+ Share
'fl! City of Warrenville Govern men t
11ru i1JM1tf January 4 at 2·28pm \'
The City Is participating In a worl<group to help update the DuPage County
Natural Hazard Mitigation Plan , which will be adopted by the City In Spring
2018. A hazard mitigation plan can help communities Identify vulnerabilities
and develop strategies to mitigate risks and Impacts. To learn more or
participate In the Public Input Survey, please follow the lin k below.
http://www.ctupageco .org/OHSEM/Protectoupage/56263/.
The survey wm close on January 16th .
DuPage County IL -OHSEM -
Natural Hazard Mitigation
DuPage County IL Government Website with
information about County Board officials, Elected
Officials, 18th Judicial Circuit Couit Information ,
Property Tax Information , and Departm ents for ...
DUPAGEW ORG
'" Like •Comment ...+ Share
David L. Brummel likes this
Tweets
3,003
Followin9 Followei s Like.\ Moments
152 1,2 19 211
City of West Chlc•go @WestChicagoiL ·Jan 3
Important information about tomorrows pubr.c me eting on DuPage County's
Natural Haza rd M itigation Plan.
@
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OuP•51• CountyOHSEM 0 @ProtectOuPage
DuPage OHSEM host1 public muting on Natur!I Huard
Mitigation Plan from 1-2 p.m . {Thurs. Jan . 4). View the
attached P.ress re lease and below link;.
-Draft Plan Summal)< 900.gl/QdjCLW ...
Appendix B B-5 2018
Natural Hazards Mitigation Plan
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Appendix B B-6 2018
Appendix B
Na tural H azards Mitigation Plan
l Ill A~l l Okl f 1)\1 Vil IM~I
FOR IMMEDIATE RELEASE Contact: Catherine Schuster
Marketing & Communications Director
cschuster@vlllageoflisle.org
(&3oj 211-414a
VIiiage of Lisle to Host Natural Hazards Mitigation Plan Open House
Jam,1ary 3, 40'18 -The Village qt Lisle will host a pvblic Open t-jouse to pres~ni \he drcift
countywide Natural Hazards Mitigation Plan on Thursday , January 11, 2018 from 7 p.m.
to 8:30 p.m. al Village Hall, 925 Burlington Avenue !. Lisle. The mee~ng will be an
inform.a{ gathering , proViding community members the opportunity to provide comments
on the draft plan and spea k with Village staff.
The Natural Hazards Mitiga.tion Pian help s community leade rs recognize and evaluate
the types of natv ral hazards th.at impact DuPage County , includi ng floocl s, severe winter
storms and eXtreme heat. During the plann ing process, communities work togettier to
~stablish ~oals and develop strateg i es to reduce the long-term effects of nailiral hazards
in our area.
The draft copy of the Natural Hazards Mitigation Plan , along with an .Executive Summary
of the plan may be reviewed al Village Hall or accessed at the following Ji nks:
Draft Plan Executive Summary: htlps://goo .gl/QdjCLW
Draft F>lan: htlps://goo .gl/5KbsTQ
Comments will be taken during the Open House and may al so be made orilhie at:
h tlps ://go6.gVzbZS1 W
For quest ion s', pf.ea se contapl the Village of Li ~le Stonnwater Administrato r Marilyn
Sucoe at msucoe@villageofHsle.org or at (630) 271-4107.
B-7 2018
N atural Hazards Mitigation Pl an
~tome • Top Siorl<s • Open House: Count1N.1de Natural Hazaras r.tmgaiion Ptan
Archives By Year
2 0 18
2017
20!6
20 15
2 0U
2013
20 12
2011
2010
Appendix B
Open House: Countywide Natural Hazards Mitigation Plan
Tne Village of Usie wm llOst a public Open House to pcesent me dran coun1yw1ce Natural Ha zaros t.1 1tigation Plan. Al l OuPage County
residents are we1<:ome to attend.
Thu rs day, Janu ary 11 , 2011 lrom 7 p.m.10 t:30 p.m.
Lts rt Vllfagt Half, 92& Bu mng 1on Avt.
Tne meeting villi be an inr0<ma19ail>eM9. piovlding «lmmunny me milers tile opportunity to pro,;ae comments on tne o ra~ pran . Stan
from Downers Grove wl1l alSo be presen t to gat~ !ee<l~acK and ans\\er que sliOfls.
me Natural Hazards r.11u9ation Ptan h<!tps ccmmunr.y leadelS recognize eM evaluate tne types of natura l Mzards l hal Impact
commun nies in Du Page county. 1nc1uo1ng tiOO<Js. seve re 1'1nter storms ano exu~me neat ounng the planning p<ocess communities
wo11< tog eth er to es iabli sh goals ano oeveiop suate~les to rtauce Ule 10ng-1erm e:recis of narural hazards 111 ou r area
Tne dran copy oroie Natural Hazards MlilQa llon Plan. al0!19 wi1ll an Exe<::ll'..Ve Summary or tile plan can be acce1seo !~rough Ole
roll0'.,1ng nnu:
Oran Pl an Execuuve Su mmary
Oran Plan
comments v.ill I>! taken ourlng Ole Open HOuse and can also ce made on:ne a~ Na1ura1 Hazaros Mmgat10n Plan commen:s
For quesu0<1s . ptease contact Vloage ot Downers Grl)l;e S1ormwater AOmlnfilrat°" lS!I Ju 11e Lomax or Ell Keny Se nr at (630) 434-5600.
B-8 2018
Natural Hazards Mitigation Plan
People Who Shared This
Appendix B
:i~ Village of Glen Ellyn ·Governme nt shared Village of Lisle -~ t. ~ ~ i Government's post.
...
~iJ hiS \(\
Please note that all DuPage county residents are enco.uraged to atterid this
Open House on Thursoay, January 11 . Residents can hear more about and
provioe f.ee·oback on the current draft of the cou ntyWid e Natural H.azards
Mitigatioh Plan .
Show Attactirn en!
() t
rfJ Like CJ Comment ~Share
8-9 2018
Natural H azards Mitigation Plan
r:twa I Mu1Jng1 I Jon a I OlttCJori I S:••Uc t ua
THE COUNTY OF DL!PAGE
l'iHE.UOK, lLLr:<OJS ·:t Stltcl L!nQuage I Y
HOME 1 W/Ufl' TO COURTS PltdP?;ll.TY U{FO St::R.VICt:S ~OIJlITlr BOARD ELECTED OFFICIAL.'!' DEPARTM F.NTS
Homeland Securitv
and tmHgency ·
i.\Ianageruent
(OHSEm
HctTitl l A4 Slcurtty Jnd
EmflgoncyM>nlJ t m•nt Homo
.t.eoutOHIEM
EmtrgoMy Prtpman1u
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Append ix B
Purpose of the Natural Hazard Mitigation Plan
• Et'.l!Jft OtJPagt County 1N iu mut"lie1p1fi1i'H qvl!ify roi fad.anl f\mding. f:s'.:>i·t. a'"<! 1fter J gj! Utif G"~UU .
• ld 1n~t,. oc.m.mor tf'r11a and f.u !ldJ tl'~• Co~t'tf fa.e.e s
• Ot'fl\:.p ~~lfr/jn mibg.n-o r. 1tratt$•U t ni!.IMq a camprs r.1r.1i\·• 1nd 11-1 i0r21 !ll"P'"Ofcil ti \i J~
• Otva•:1> iniu~-c-v t mfl'll~t JI C.lf'Vltts h;p-1 v1ith11i th• C:.1.1::0.i)'.
• G.1 1r. pvbl ic iJu..;?'tt ir .. : s~J!t publtc inf¢rmat~r if..:rU J1"-? ru~:-er.u kr.·:tn!edgt !lhl ;<'1.t·!!t-j:'!Ut igainat tht Count'{! uirutt Jr»
1>1nrd1
What is Hatard J\Iitigation?
A~e<>·~"'~ to> t>:t FtJtr•\ Enw~•i('1 l.11na9•mtr.1 A~tney (i'EMA) r.u11d n>i1>~1 tion ti
'th! ti!r,tt to rt~.:t ~ cl /!le f ft'J pti:pt.'ty t::y 1-u~tr.J'i'} ti12 imFt~ r.l diH.J:!fl Jl 1.J m~s! 'J/ft-J!.h'e wh an trn;;l!mt.t!!~d Lln~u a
c~mpf•J>4."N1\-ti IM9-!tfm m.i:ig 16}f; ,clan S!tit t.11b1,, ;nd >c-csr gc,·•~mtn:s If;:•:• in 1:uard mi't;;Jtlc:n pll!Vti.r'1 t~ ~·tn!tf/rl$kS arid
\>V1°11f:t1b~'tif..s 1$.sc--;;1tf4 wt.h n1tural ~jJJS-!tt~ 1n:J dtJ·tJap /i;f'g..tum .!t.rart.gi'i! lort.M1!1:-!ift1 ~1.;P:i ift>j f:l~irty fr;.m fiJrurt f'i uard
tvtnts •
Ftdtul E.1~u~1ncy M .1 n a ~1rr.a ntA'1•1ey. (20 1('.i H1111d l.M>;ation PJ.lr.tlflg i\t~·-wvtd ot, N·:>~tm:..· 15. 2017. R1-:ritt1 1-l f'c:rn :
)'1 Uif '11):/\w 1 f yn1.acv l\t nf P·rn:1i o 1t~ .. J::!!:"!n·AA
History of the. DuPage Coilllty Natural Hazard ).litigation Plan (NHJ\IP)
Thi OuPJ-;t Coun.t;i NH\il P wu f~·lt dt'il¢c+j in 2'30'. through J gran t 1wu·nl t~ CuF1•t CciJ r1t/ S~orr.tw11er Man1~1rr 1n:.1r 2010. t?'t
OuP1ga C.o~r+t/ Off>.:t of Horn-• 1"14 S-te.!rr.y and :mergtncy ).1Jf!Jgtmt,'\t (OHSEM} b•u:ne th1 c~c-..J• g¢'J1rritr19 C·>1y cf th & _p:.!ti 1no iht
u 1~:i J:tQ \\~UQ ro up. Pu10.iti t.i fo· .. "Y.n thi C:..jSEM t<l-cr\f .. "!cttd :ha "°n FfJn L-~1.1 ~-1 i r .. ~ 2013 ~lit adc~v.in . Fcllcwlir~· U.1 C<·l.ltir(i
a~'Y,.-'~on .i May 2413 . OuP 1 ~t County mun1e:p '°li u adopt!' ll'.• plao
2012 Natural Hazard .Mitigation Plan and Annual Reports
Tht ~-J~ .vu wrir.tn l'I 2012 .1r.d idoplld by lnl O•PJii Cc:vn r/ Soord .;o 111114. ~!$. To rt•:'m :ha pl.Jo or 1ubl•l·~~' '"""''1 r•i:olU.
cl1e~ 1h1 '°~' below.
• lQH NJturJI Huara 1i.1 .. 1:1gattor. PIU\
• ?P t 41<11ur1I Hat.i14 ~~itio atkin Plan Rtoou
• 20t ~N1-tyr11 Huttq Mifig!jio:n Pl1n Racon
?0 16 ftif1ural Haztt.j M itip at~ P120 Re oort
2017 Plan Update
01' N-:vtl'?\t~ 61~ 2017 tht O<JFJgi Co~zit1'1 Offie! of Ko:nefand S..·:ltrity i na Efl't-:~.an•!"jl.!au~inant ~tOITTl\'1it11 f,t!"~f!'1"lt:nt. S1..1iJfil\~
1M Z·~n 11-g Ca !larttnii:. ind tt'.t 01parvn1nr cf Public V\~:•~s . >l id i <tie"<-o f! rr-ntin9 ;o t.1-)tr. Via~ y;v upditi to thi NHM!=. Mlrrlkip a1
ta~i u ttu tivu ttom Em1rg1.ic1 M1.n1-gi mtr1t S:orrv:w11a;. :ana Ft.tof t \.V~rk.i VTU& jlvila.1 fr~m a•i tr.'.ltti:;pJlifu . "~iu tll\Vfl i . end vilfagu
V11fi:n and !Ouei':t-.o tM Go:J'l!Y bordus . F:ro: t'l Mt rr..tt1ing tl\e CGur.ty di suibutT: a iurviy io !Jch mu nl¢!.p sf.-:y tequut1fig fudb1c-: ~ botk
tht 2013 plan •~O l°"l upd 11>
Currt nLy &.i ~wr.ty ;1 we.tki ng tc f~m J o:-6Jt<:ZJtivf C~i'lt'/ &!'t:S munit.'$-J \\':'i.1.;group so UiJit \\.-tl', th a ~<.J;t llJ)\liti at!ii l! ~:¢;ddl1tin-p a
c .. J':.to-O'Jil tse)i. tr<t.-ttlng JttC s i.1r\•ey. Tn.a \W<group \•Jill mut tY anus the Cour.ry·i h.urds, ~r:11>!.!:1ns JHl)citt~i w.~h 11ch h1nrd, d~v:,)-0
~·).l:S fo r !ht Countf u • \'t':\o'.f . l "d d!V!'l(>.o M<ttgJt !<·n !tr.!t!oi ~H Tr.t workgro•Jp \•,i,J \~Ork to !nt-u!i tl';!n 1t11teg1u ancomp an the
follOIYil~ nvon e•li~or u of ml1>91.11on:
• F'!i\'tntativt 1'1NIUIU
• Ptc~~rty l'rGlttl:,,.,
• Nat-.:.11 1 Rtto\JfCt P1ott cb~r.
Emlfg•ncy Sirvicu
• Swctu<JI Flood Cont<cl Projaea
• F'i.1c-'>: lnfi:>rnut~r·
8-10 2018
Natural Hazards Mitigation Plan
O;;~e. ihi: i;?.;ir. upd•ta i> c;,:.mpl2ts . :he ;;;.3!1 1•1 '! bi!iVi9\\'fj b/ tr ;; ilfino?;; E m ~rgency l1lanage~r.1A.g:r.q (I EMA) =r--:i FEMA Once tt : plan
'!Ju l:·-ea~ !ppro•1ed. the Count; 60.:'d and p:rtioij:.;ting niunioif:\3 1 bo3 rds wiil adopt t l:.: plan tl iroOJgh a fornial ••solution Fer '-'l'l-i!i> on
m1:et111g datu, t ·nie:. [~tC'i :i , and ~J:f>:ly a•;.1 ~a'l:,:i i ·.me1:. i;.}i::e d1eoK this page.
What's New?
F ut!,<: Input Surve1 fonhe DuPa~;, County N at~r.1 ' H~urd M1t>q1tion Pll r. 20 17 Updat:. (Now clos:::f)
Prior fl eecings.·
2017 Plan 'Jpd3ti Kic'<·OH M eet'r.,~ Agend3 l;ere
2•'.)13 N1iural HaZJ!•j M :igat•>.i Plan 3-;.j IJ~d.;:e Mut'llg on Janu3ry 4t ~. 20 t8 at 3.W-9:90 ant Agi:ndJ t-~r<;.
20 13 Na tural Haz.a'd llt tig3tc.1 Plan r-~~·: Mu~11g on J3nuary 4t r,, i (H S at l :D:l-2 :00 pn1 in th: c -:i .. •r.1y Soa;d Room at 421 N. CovM/ Farm
Rd , 1N 11u:on. ll-001s;.
Dnfc /Aatflills for 2'018 UHA!P and P-sJblic Comm em:
201~ DRAFT E>:ec·Jli": Pl3n S\J 11rr.•"t-Summ irv h:re.
2018 O~rag;, Co11n:y CRAFT OuP1ge N!N'.!l H.JZ!rd M i ~gaiion Fia.:t Pl3n no:·:.:.
2 01& NHM? Public Cc-1 1m:~t L~~IS iler7.
Additional Information
• Feder!I En1ergenoy Msnagem:r-.11< .. t,;:r.~y. (201ii Whit! is Mit.ogsh'on ? Ret ri :ved or, Ho.,·.;,rn be r 15, 20 !7. Retri:ved from:
h-!to;:;,'111w1 .f,;~13_q~v1\•1hat-mi t fi}l11on
• Illinois Err<tr.;-tr.cy W.~r,a1i.•ner1t AQeney. {N.O.) M1li9!l<:-n Plann.'ng. R::rie•1;,~ on N-e.vem~r 15. 201i. Re:ri e\•::i from·
hitps:/J\o11w1.illinoi!.go•1:ie m;:Miti ga &:·n:Page:1Planning .a·:p:<
Tru:. Co filj"TY Of DuPAGE
WHE..<\TON, 11.LINOlS
Jl•w• I Moo!lng t I Jobi I 01r0otory I conuot ua
HOME I WANT TO COURTS PROPERTY INFO Si:RVlCES COUNTY BOARD l.l.ECTED OFFICIALS OF.PARTMf.N'FS
Building Division
8ull<llng GM11on Kom•
My Ftrmlt Sla!ul
Gmn BuU4 •n~ lnct nl!vt
Pro1ram
Llnl to Bull41.ng Ptnn)ll
1nrormstlon11 8u1101ng
Broc.nuru
Appendix B
Building Projects and Permits for Unincorporated Areas of
DuPage County
Residential Projects
BUILDIKG PROJECTS
• eV!-,.~ a l't<>yu
E111l~ an i~iitlon
B-1 1
News
N•iural Hawd l,f,1iga \'9>i Pl1n.
10 rttf1*W l f'.d rr.1kt ~ommentJ
plus• t~t~k tnt f.nk
Owi,sl s 19 r..i turt i.J ~•::v lffr! on
~1• appiNticn 1! th• ti n» of
!V ~lir.Jl Ot I ti O:Jti:.tO
1~.g l\.1:u r1 ot. our owner
!vt~et~1~ 1.:.-..,n
20 18
Natural Hazards Mitigation Plan
Appendix C -Resolution Examples
Below are examples of resolutions that were used during the development of the DuPage
County Natural Hazard Mitigation Plan, including:
• Resolution Example for Creation of Mitigation Workgroup
• Resolution Example for Joining the Mitigation Workgroup
• Resolution Example for DuPage County to Adopt this Plan
Resolution Example for Communities to Adopt this Plan
AppendixC C-1 2018
Natural Hazards Mitigation Plan
RESOLOTION
JPS-006-13
Adoption of the
DuPage County Natural Hazard Mitigation Plan
WHEREAS, the County of DuPage is subject to natura l hazards, such as floods,
severe summer and winter storms, tornados, extreme heat events; and
WHEREAS, natural ha za rds can tlu-eaten lives, damage property, close businesses,
disrupt traffic, and present public health and safety hazards; and
WHEREAS, the DuPage County Hazard Mitigation Plan Workgroup, originally
created by resolution of the DuPage County Board of Commissioners (SM-0008-06), has
prepared and updated the DuPage County Natural Hazards Mitigation Plan that reviews the
County' s options to protect people and reduce damage from the hazards; and
WHEREAS, the County has participated in the development and update of the DuPage
County Nal1tral Hazards Mitigation Plan; and
WHEREAS, the recommended DuPage County Natural Hazards Mitigation Plan has
been presented for review by residents, federal, state and regional agencies.
NOW, THEREFORE, BE IT RESOLVED that:
1 . The DuPage County Natural Hazards Mitigation Plan is hereby adopted as an official
plan of DuPage County.
2 . The DuPage County Natural Hazards Mitigation Plan identifies a series of action
items. The following action items are hereby assigned to the noted department,
division or office of the County. The designated department , division or office shall be
responsible for the implementation of the action item, provided that resources are
available, by the deadline listed in the Plan.
Action Item 1: Establish Sub-Workgroups within the Mitigation Workgroup
Action Item 2: Enhance Public Participation in Mitigation Workgroup
Action Item 3: National Weather Service StormReady Participation
Action Item 4: Critical Infrastructure Identification and Verification
Action Item 5: Critical Facility Back-Up Generation Assessment
Action Item 6: Adopt County-Wide Public Outreach Monthly Topics
Action Item 7: Flood Control and Property Protection Projects
Action Item 8: Improve Building Code Ratings
Action Item 9: Incorporate Mitigation Concepts into Future Planning
Action Item 10: Participate in T ree City USA
Action Item 11: Participate in Community Rating System (CRS) Program
Action Item 12: Participate and Support Floodplain Management Studies
BE IT FURTHER RESOLVED, that the County Clerk be directed to transmit certified
copies of this Resolution to the Illinois Emergency Management Agency, 2200 S. Dirksen
Parkway, Springfield, Illinois, 62703 and the Federal Emergency Management Agency, 536
Appendix C C-2 2018
Natural Hazards Mitigation Plan
South Clark Street, Chicago, Illinois , 60605.
Enacted and approved this 08th day of May, 2018 at Wheaton, Illinois.
ATTEST :
Appendix C C-3
Daniel J. Cronin, Chairman
DuPage County Board
Paul Hinds , County Clerk
2018
N atura l Hazards Mitigati on Pl an
R E S 0 L U T I 0 N
SM-0008-12
DuPage County Natural Hazards Mitigation Plan
Work Group Participa tion
Whereas the Co u nty of DuPage is sub j ect to natural
hazards , such as , floods , earthquake , tornadoes , seve r e wi nt er
and summer storms that can damage p r ope r ty , close businesses ,
disrupt traffic , and present a publ ic healt h and safe t y
hazard ; and
Whereas Du Page Cou nt y i s undertaking a natura l
hazards mitigation p l an for the County ; and
Whereas the County has invited the Cities a n d
Villages loca t ed wi t hi n DuPage Co u nty to participate in and
benef i t from t hi s pla n n i ng effort ; and
Whereas several Federal programs requ i re t h at DuPage
County have an adopted haza r d mit i gat i on plan to qualify for
t h e i r benefits ;
Now , therefore , be it resolved tha t:
I. DuPage County hereby sta t es its interest i n coo r d i nating
the Coun t y 's mitigat io n planning process .
2. Coun t y S t aff is hereby appointed as our representative on
t h e County 's Mit i ga t io n Workgroup . He /she is charged
with :
a . At t ending the regu l ar meet i ngs of the Co u nty 's
Mi tigat i on Workgro u p ;
b. Keeping Cou n ty staff and t his Board informed of t he
Workgroup 's activities and recommendat i o n s ;
c. Assisting the Coun ty's efforts to collect i nformation
about t h e hazards facing the Ci ties , Vil lages , a n d
Unincorporated areas of DuPage Co u nty and ou r current
po l icies and programs that ca n mi ti gate the impacts of
those hazards ; and
d. Obtaining i nput from County staff on mitigation issues
relevant t o the ir work.
3. Wh en the County 's Mit iga t io n Workgroup has completed its
wo r k and presents i ts recomme n ded plan, this Board will
Ap pend ix C C-4 2018
Natural Hazards Mitigation Plan
review it with t he intention of adopting all or parts of
it . It is understood that this reso lut ion of commitment
to participate in the planning process does no t
constitute a commitment to e nact the recomme nded plan.
BE IT FURTHER RESOLVED that t he County Clerk be direc t ed
t o transmit certified copies of this Resolu t i o n .....
Enacted and approved t his 8 th day of August 2012 at
Wheaton, Illinois .
ATTEST:
Appendix C C-5
Da niel Cronin, Chairman
DuPage County Board
Gary A . King , County Clerk
20 18
Natural Hazards Mitigation Plan
Community Resolution to Join Workgroup:
Resolution No.
Where(IS the City/Village of is subject to natural hazards , such as, floods,
earthquake, tornadoes, winter and summer storms, and manmade hazards, such as , utility disruption
and transportation incidents; and
Where(IS the DuPage County is undertaking a natural hazards mitigation plan for the County; and
Whereas the County has invited the City/Village of ____ to pa11icipate in and benefit from this
planning effo11 ; and
Whereas several Federal programs require that the City/Village of ____ have an adopted hazard
mitigation plan to qualify for their benefits;
Now, therefore, be ii resolved that:
I. The City/Village of ____ hereby states its interest in participating in the County's mitigation
planning process.
2. is hereby appointed as our representative on the County's Mitigation
Workgroup . He/she is charged with:
a. Attending regular meetings of the County's Mitigation Workgroup;
b. Keeping City/Village staff and this Council/Board of Trustees informed of the
Workgroup's activities and recommendations;
c. Assisting the County's efforts to collect information about the hazards facing the
City/Village of and our current policies and programs that can mitigate the impacts of those
hazards ; and
d. Obtaining input from City/Village staff on mitigation issues relevant to their work .
3. When the County's Mitigation Workgroup has completed its work and presents its recommended
plan , this Council/Board of Trustees will review it with the intention of adopting all or parts of it. It is
understood that this resolution of commitment to pa11icipate in the planning process does not
constitute a commitment to enact the recommended plan.
ADOPTED this the __ day of _____ , 2012
Clerk of the City/Village of ___ ~ Illinois
APPROVED this the __ day of ____ , 2012
Mayor/Pre sident of the City/Village of ____ , Illinois
Appendix C C-6 2018
Natural Haza1ds Mitigation Plan
DuPage County Resolution to Adopt Mitigation Plan and Continue Workgroup:
RESOLUTION
SM-_-12
Adoption of the
DuPage County Natural Hazards lvfitigation Plan
and
Continuation of the Natural Hazard Mitigation Workgroup
Whereas the County of DuPage is subject to natural hazards, such as, floods, severe summer
and winter storms tornadoes, extreme heat events; and
Whereas natural hazards can damage property, close businesses, disrupt traffic, can threaten
lives, and present public health and safety hazards; and
Whereas the DuPage County Hazard Mitigation Workgroup, created by resolution of the
DuPage County Board of Commissioners, has prepared the DuPage County Natural Hazards
Mitigation Plan that reviews the County's options to protect people and reduce damage from the
hazards; and
Whereas the County has participated in the development of the DuPage County Natural
Hazards Mitigation Plan; and
Whereas the recommended DuPage County Natural Hazards Mitigation Plan has been
presented for review by residents , federal, state and regional agencies;
Now therefore, be it resolved that:
I. The DuPage County Natural Hazards Mitigation Plan is hereby adopted as an official plan of
DuPage County.
2. The DuPage County Natural Hazards Mitigation Plan identifies a series of action items. The
following action items are hereby assigned to the noted department, division or office of the County.
The designated department, division or office shall be responsible for the implementation of the action
item, provided that resources are available, by the deadline listed in the Plan.
Action Item 1: Establish Sub-Workgroups within the Mitigation Workgroup
Action Item 2: Enhance Public Participation in Mitigation Workgroup
Action Item 3: National Weather Service StormReady Participation
Action Item 4: Critical Infrastructure Identification and Verification
Action Item 5: Critical Facility Back-Up Generation Assessment
Action Item 6: Adopt County-Wide Public Outreach Monthly Topics
Action Item 7: Flood Control and Property Protection Projects
Action Item 8: Improve Building Code Ratings
Action Item 9: Incorporate Mitigation Concepts into Future Planning
Action Item 10: Participate in Tree City USA
Action Item l l: Participate in Community Rating System (CRS) Program
Action Item 12: Participate and Support Floodplain Management Studies
3. The DuPage County Hazard Mitigation Workgroup is hereby established as a permanent advisory
body. lt shall be comprised of representatives from:
a. The County's emergency management, stonnwater management, Public Works, GJS and any
other office that might be directly involved in the implementation of the Plan 's action items as
determined by the lead agency.
Appendix C C-7 2018
Natural Hazards Mitigation Plan
b. Those mu nicipal ities that pass a reso lution to adop t the DuPage Coun ty Natural Ha za rd s
Mitigation Pl an and se nd a representative to atten d the meet in gs of the Workgroup.
c. Representatives of other interested agencies and organizations and associations appointed by the
Chair of the Cou nty Board of Commiss ioners to rep resen t stakeholde rs in hazard mitigation and
the general public.
3. The Workgroup sha ll meet as often as necessa ry to prepare or review mitiga ti on activities and
progress toward impl ement in g the DuPage County Natural Hazards Mitigation Plan. It shall meet at
leas t once each year to review the sta tu s of ongoi ng projects.
4. The sched ul e of Workgroup meetings sha ll be posted in appropriate p laces . All meet ings of the
Workg roup shall be ope n to th e public.
5. T he Workgroup shall prepare an annual report of th e DuPage County Natural Hazards Mi tiga tion
Plan for th e Cou nty Board and th e municipa liti es. The report will cover th e fo llo wing points:
a. A rev iew of th e ori g ina l plan.
b. A rev iew of the natura l or man mad e disaste rs that occ urred during the previous ca lenda r year.
c. A review of the action items in the original pl an, in clud in g ho w much was accomplished dint
eh previous year.
d. A discussion of why action it ems we re not comp leted or why im pl ementat ion is beh ind
sc hedule.
e. Reco mm endati ons for new projects or revi sed ac ti on items. Suc h recommen dat ions shall be
su bj ec t to the approva l of the Co unty Board and th e affected municipality's govern in g bod ies
as amendments to th e Plan.
6. The \Vorkgroup sha ll updat e the DuPage Co unty Nat ural Haza rd s Mitigat ion Plan every five years,
according to requirements provided by th e Federal Eme rge ncy Manage ment Agency, fo r the
consideration of the County Board and the pa rt icipati ng municipa liti es.
BE IT FURTHER RESOLVED th at the Co un ty Cler k be directed to transmi t certifi ed copes
of this Resolution_.·~· _to the Illinoi s Eme rge ncy Management Agency in Spr ingfie ld , Illinois, and
the Federal Emergency Management Agency in Chic ago, Illin o is.
Enacted and approved this_ day of 20 12 at Wheaton, Illin ois .
Appendix C C-8
Dan Cron in, Chairman
DuPa ge Co unty Board
Ga ry A. King , Co unty Cle rk
2018
Natural Hazards Mitigation Plan
Community Resolution to Adopt Mitigation Plan:
Resolution No. -----
Whereas the City/Village of is subject to natural ha zards, such as,
floods, severe summer and winter s torms tornadoes, extreme heat events, and
Whereas natural hazards can damage property, close businesses, disrupt traffic, can threaten
lives, and present public health and safety hazards; and
Whereas th e DuPage County Natural Hazards Mitigation Workgroup has prepared a
recommended DuPage County Natural Hazards Mitigation Plan that revievvs the
CityNillage's options to protect people and reduc e dama ge from the ha zards; and
Whereas the City/Village has participated in the development of the DuPage County Natural
Hazards Mitigation Plan; and
Whereas the recommended DuPage County Natural Hazard'! Mitigalion Plan has been
presented for review by residents, federal, state and regional agencies;
Now therefore, be it resolved tit at:
1. The DuPage Counly Natural Hazards 1\1itigalion Plan is hereby adopted as an official plan
of the City/Village.
2. The DuPage County Natural Hazards 1\!litigation Plan identifies a series of action items.
The following action items are hereby assigned to the noted person or department of th e
City/Village. The designated person or department shall be responsible for the
implementation of the action item, provided that resources are available, by the de ad lin e li sted
in the Plan.
Action Item 1: Establish Sub-Workgroups within the Mitigation Workgroup
Action It em 2: Enhance Public Participation in Mitigation Workgroup
Action Item 3: National Weather Service StormReady Participation
Action Item 4: Critical Infrastructure Identification and Verification
Action Item 5: Critical Facility Back-Up Generation Assessment
Action Item 6: Adopt County-Wide Public Outreach Monthly Topics
Action Item 7: Flood Control and Property Protection Projects
Action Item 8: Improve Building Code Ratings
Action Item 9: Incorporate Mitigation Concepts into Future Planning
Action Item I 0: Participate in Tree City USA
Action Item 11: Participate in Community Rating System (CRS) Program
Action Item 12: Participate and Support Floodplain Management Studies
Development of a Public Information Strategy
Property Protection References
Appendix C C-9 2018
.,
·\ ,.
Natural Hazards Mitigation Plan
3. name] is hereby appointed as the CityNillage's
representative on the DuPage County Natura l Hazards Mitigation Workgroup. The offices
cha rged with implementation of action items in Sect ion 2 shall ke ep the representative
advised of their progress and recommendations.
ADOPTED this th e __ day of ______ , 2012.
APPROVED this the ___ day of _______ , 2012
_______________ Mayor/Village President
Appendix C C-10 2018
Natural Hazard Mitigation Plan
Appendix D -Public Input Survey Results
Below are the results from the Public Input Survey conducted by the workgroup, throughout the
month of Decembe r 2017, to obtain resident input during the development of the DuPage County
Natural Hazard Mitigation Plan. The survey, which collected 49 responses, asked residents to
identify:
• Their jurisd iction (i.e. city, town, village, etc.);
• Natural hazards they or someone close to them had experienced within their community and
within last 10 years;
• Ha zards that most concern them when considering their family's health and safety;
• Ha zards that most concern them when considering their community as a whole;
• Their feelings regarding community education and their level of preparedness;
• And, steps they've taken to prepare for a natural disaster.
Appendix D D-1 2018
Natural Hazard Mitigation Plan
Number of Participants
\l/~O~l e I 41
W ~a1on I ~ •
W'!~GO.t l::J
Wcst Cli i~o ~·
Wurtn,.,m: C'.:j
Vi:Jt f-Mk c=J
~l aio !ra11'1fe ' J
l!~c I. rt JI ... ;:z==e:+. I
lra ;c:a 1: I
G!e11 fJtyn c
flrrih ursl e:z=J
D9VAi eJ S Gr4V e CD
Caro l Strw m c
Bartlett CJ
Au:ora
I
c::J
1-\dd ~°" ~
10
In the past 10 y~ars , have you or someonErclose to you experienced a natural disaster within you r
c9inmuill ty?
Appendix D
• FlOOd t34) 5':V <!ID ~ln<)J Sloim 1Hi911 W llld i , ~l .:u'I, M N:tobmsl . OIC.) (301
SO 'f<ltO W ITTl or Sl orrn (6 1i:;;~rd Extr ~ Cold. OIC-) (:/S i
n EWomo •loal (61
• D rlhlglll (5) • tornaop (2j
• j;qrt 11Q11.V..O ( I)
D-2
l~
2018
Natural Hazard Mitigation Plan
Of the following . what hazards concern you the most when considering your family's health and safety?
11>1
I ~ 26
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I
It. I
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II
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rlDDtJ s~~vH ;Su l ltlit7f ~S~\"il l O W ml,;i1 s E•:r;;i11c. I l~nt
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• S~ll!o Wlntor Srorrn (Oh.u.afo, E.wcm» Cold, otc.\ (1 7)
• £x t11:>mo Moat II 3) 01ough l (2)
B EArt11qual\o (2l
Of the following , what hazards con~ern yo~1 the most when considering your community as a whole?
Appendix D
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18
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Flood {!JS) Tomqdo f20) B Sovoro Sumrnor SIOrm (lligh Wlnds, MDll, Mtc1o bu1 :1t 1 1.ltq /:13)
• Sevo10 Wln\of Stonn (Bllzillid, E":<llolllo C(lld, olc.) ( 18)
• Extronio Ha-01 (8) 01ought (2)
Enrt'1quoko /2)
D-3 2018
Natural Hazard Mitigation Plan
How prepared do you feel to handle a natural disaster?
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• F mr (llJ) ExcQllcnl I G) Poor (S >
Ho\Af do you feel your commynlty is doing to educat~ resident~ about hazards and how tQ be prepared?
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Good (22} lfl Fllll (I I) • I ;1111 u11 s u1t! (5) • Pc>tir (5) • E X C£>1h~t\I (4)
Appendix D D-4 2018
Natural Hazard Mitigation Plan
How prepared do you feel your community is to handle a natural dlsaster?
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6
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Fnir (20) Good 118"1 II l(m1 unsuro (5) • E~colio n! (4) • Poor (0)
What steps has your household t ake n to prepare for a disaster?
I ovm an ox1rn llashllght. 00%) I h.."Ve oxtr;i b<litcries (10'\\.l If I l\avo n can <>Pl!nor. (9%)
• I ovm a tiri;r aid IOt (9%) • I havo a l irn oxringuishilr. (8~~)
I t1a•10 a poncho 01 olher 110111 lo p10(oc1 mo rmr1 rain. (i~,;.J l'il I have laip. {6~)
I S(OIO coplo~ ol llllpvr1£1 nl dOOU111Dfll.S Ill nMlhc. plru:o , e.!ed!Onlfllllly. M d/01 Ill a flll.! and Y/ll(N pL
I 1'11VO ro<:ofvod fllGI Al('(/CPR .1r11111lf 1Q (~W.) Ill 1-!i!oro o~ha -vn111r, (5'l~}
• I ~!Oro 3 clil_rs v.'ii/1'' ot oAlri\ non ponshablo loo:J . (5~)
• I slo•o mrira non p.or1~1inblo 100<1 (5 ':\)
I ~1010 3 (iayr; worth ol Q1.1ra wa!or (.!,~)
I ow n a baltl!ry JXlYl'Oled and!or crank woa1hor radio. ( 4 ~~)
I liave a first aid oi o!h!lr boo!\ fl){ rt>f1>tonee. (4%)
My t.11n uly has oos\!1n<llod nn ovt ol town CQn!nc.t 101 omi!l!}t!ni:l11~-(4%)
• I hnvo 1a~o11 coplo5 ol l111pm1n111 doculfl!l.11 1 ~. \2o/..)
0
r ncx
Ill t hav() .,.11a 111onoy '1111:l10f chocks. (6%}
I h.wo a ba5lc loo! kli lo• ropgir~ (Le: ha01m c1. 5CIOW d1lvor. etc.) (9'1.J
II I llavo OUCI to po for EfOOf~ 1op11!u1_ (1!%)
• I lli.lve (lx1111 andlur d1Gpo9'1blo platos, $llvotwwi;, c111>J1 , 111111 ru1pkJns le'i':\.J
M I hi!·.-o 1owul5, towole ll ~. and'o1 9:irbnQo bag1101 M1111a1100 . (8'Y.)
• I ~avo a slccplnQ llpa ~ o~lrl\ bl_~nl\ots <B"-~
• I ti:1vo o>Ui'I r.lothinf), 1n1:l11<1111Q 10110 pnnln . .n long shin . M<l 5\urcly aho<>~ (n'•)
1 tr.ivo an otl•il 1>od or pap0< nnd !l wfJ/poocn r7"4 1
r.l I ha l/ll t>xtta matchtiS Ii:> l iqh1 a liro . (7%)
I hwo ptote<:tive gl ovllS. I f>"!t)
I h.:!vt! oxtr<1 p_orso(lnf hyg1nne piooucts. (&%.)
AppendixD 0-5
• M~ OfllC'rQCOCY IWrna a11.> fl.'adily D.QC~~olblo !S ~f
I hnvo P d11.11 mnt\.; or olhc1 p1o1e<:livo mn~k (~}
0 I Ila"" e.:!Ja rnodlcafiol'l . copios or my p«iscripliQns , w\dlor o~Ha 11.•.a.s~ t41·o)
I l>avo a wlli$Uo to signal for holp. (4%)
01 I r.av!' i;..rra pol s uppl f~s (Lil. load, wa~er , e tc.) {3~4)
m I hall!! p~_por !llap;i or my :ai~a_ (2%)
• My ome1gcr11:y 110111~ aio rt!ady 111 a ball thal t1 e-asy IO ca,ry, (I %1
2018
Natural Hazard Mitigation Plan
Appendix E -Community Specific Information
VILLAGE OF BENSENVILLE -Action Items
Action Item #1:
Description:
Responsible Agency:
Cost:
Benefits:
Action Item #2:
Description:
Responsible Agency:
Cost:
Benefits:
Action Item #3:
Description:
Responsible Agency:
Cost:
Benefits:
Action Item #4:
Description:
Responsible Agency:
Cost:
Benefits:
Appendix E
Continue to seek funding for the stormwater projects identified
in the Master Plan.
Work to develop a 5-year Capital Improvements Projects
incorporating the stormwater improvements.
Public Works.
Staff time and cost of construction improvements.
Flood protection.
Deve lop a storage location to handle debris frorn large scale
disasters.
Work to develop a plan to handle, stage and store large
amounts of debris from a tornado, flood, etc.
Public Works.
Staff time and potentia l cost of property.
Provide direction to Village following emergency situations.
Continue to provide public outreach to encourage all residents
to sign up and update CodeRED.
Advertisement on Village website, newsletters, utility bills, etc.
Emergency Management/Village Manager's Office.
Staff time.
Prevention, public education and awareness.
Maintain participation in StormReady.
Stay involved and up to date with changes to the program.
Emergency Management/Public Works .
Staff time.
Prevention, property protection .
E-1 2018
Action Item #5:
Description:
Responsible Agency:
Cost:
Benefits:
Action Item #6:
Description:
Responsible Agency:
Cost:
Benefits:
Action Item #7:
Description:
Responsible Agency:
Cost:
Benefits:
Action Item #8:
Description:
Responsible Agency:
Cost:
Benefits:
Action Item #9:
Description:
Appendix E
Natural Hazard Mitigation Plan
Provide public outreach to the residents regarding the
availability "cooling or warming center" during times of extended
high temperatures and severe winter weather.
Advertisement on Village website, newsletters, utility bills, etc.
Emergency managemenVVillage Manager's Office.
Staff time.
Prevention, public education and awareness.
Obtain additional stream gauges/monitoring equipment.
During large storm events a number of locations in town
experience severe flooding.
Public Works.
Staff time and Equipment cost.
Obtaining stream gauges/monitoring equipment would allow
staff to track water levels at all time to better alert residents
and first responders.
Maintain participation in Tree City USA.
Continue to plant and maintain trees on annual basis.
Public Works.
Staff time, cost of trees, contractual operations costs.
Prevention, Property Protection, Natural Resource Protection.
Continue to maintain drainage systems.
Clean out catch basin, storm structures on routine basis.
Public Works.
Staff time and equipment maintenance.
Prevention, Property Protection.
Schedule and perform mockup emergency event tabletop
exercises.
Assign roles and responsibilities in the event of an emergency.
E-2 2018
Responsible Agency:
Cost:
Benefits:
All Vi llage Departments.
Staff time.
Prevention, Awareness, Education.
Natural H azard Mitigation Plan
VILLAGE OF DOWNERS GROVE -Action Items
Item #1:
Description:
Responsible Agency:
Cost:
Benefits:
Item #2:
Description:
Responsible Agency:
Cost:
Benefits:
Item #3:
Description:
Responsible Agency:
Cost:
Benefits:
Appendix E
Maintain CRS Class 6 Rating.
Continue various floodplain management activities including
public outreach, map information, drainage system
maintenance and flood protection.
Public Works.
Staff time, printing costs, postage.
Reduction in flood insurance premiums for Village property
own e rs.
Develop a storage location to handle debris from large scale
disasters.
Work to develop a plan to handle, stage and store large
amounts of debris from a tornado, flood, etc.
Public Works.
Staff time and potential cost of property.
Provid e direction to Village following emergency situations.
Continue to further develop our detention basin inspection
and maintenance program, includ i ng securing easements for
those older basins located on private property.
All basins have been inspected. Continue to work with HOA
and private property owners to ensure they are properly
maintained . In those cases where easements don't exist,
work to secure easements.
Public Works, Community Development, Legal Department.
Staff time.
Ensure detention basins remain functioning properly to greater
protect the Village during storm events.
E-3 2018
Item #4:
Description:
Responsible Agency:
Cost:
Benefits:
ltem#5:
Description:
Responsible Agency:
Cost:
Benefits:
Item #6:
Description:
Responsible Agency:
Cost:
Benefits:
Item #7:
Description:
Responsible Agency:
Cost:
Benefits:
Appendix E
Natural Hazard Mitigation Plan
Public Outreach to Streamside Land Owners.
Develop public outreach to streamside land owners regarding
floodplain and wetland regulations, recommended
maintenance and invasive species removal.
Public Works.
Staff time, printing, postage.
Ensure Ordinance requirements are being followed, improve
water quality.
Secure Easements of Major Creeks/Floodplain.
Work to obtain easements for all major creeks/floodplain
areas.
Public Works, Community Development.
Staff time.
Obtaining easements will allow the Village access to property
to remove debris jams, or work on the property as part of a
water quality improvement and/or streambank stabilization
project.
Obtain additional stream gauges/monitoring equipment.
During large storm events a number of locations in town
experience severe flooding.
Public Works.
Equipment cost.
Obtaining stream gauges/monitoring equipment would allow
staff to track water levels at all time to better alert residents.
Continue to provide public outreach to encourage all residents
to sign up for Community Wide Notification System for Village.
Currently advertised on Village website, work on other
notification methods such as newsletters, utility bills, etc.
Emergency Management/Village Manager's Office.
Staff Time.
Prevention, public education and awareness.
E-4 2018
Item #8:
Description:
Responsible Agency:
Cost:
Benefits:
Natural Hazard Mitigation Plan
Continue to update Village stormwater masterplan including
property acquisition.
Village currently has a masterplan that has updates based
upon 2013 Storm event. Work to expand based upon work
done to date and address areas not in the plan.
Public Works .
Staff Time, Consultants costs -variab le.
Prevention, flood reduction.
VILLAGE OF LISLE -Action Items
Action Item #1:
Action Item Description:
Responsibl e Agency:
Cost:
Benefits:
Action Item #2:
Action Item Description:
Responsible Agency:
Cost:
Benefits:
Action Item #3:
Action Item Description:
Appendix E
Maintain Class 5 CRS rating.
Continue various floodplain management activities inc l uding
publ ic outreach as outlined in the Board adopted Program for
Public Information, map information, drainage system
maintenance and flood protection assistance.
Deve lopment Services & Public Works.
Postage, printing and staff time.
Reduction in flood insurance premiums for Village property
owner and improved floodplain management.
Deve lop a Long-term Flood Mitigation and Levee Policy.
Develop a long-term flood mitigation stra tegy and levee policy in
coordination with DuPage County Stormwater Management and
US Army Corps of Engineers.
Development Services & Pub l ic Works.
Staff time.
Provide direction for Village budgeting and certainty for property
owners protected by the levee .
Develop a stormwater master plan and associated capital
improvements program.
Collect data on existing stormwater and flooding concerns
throughout the Village, develop so l utions, cost esti mates and
prioritization for future resolution.
E-5 2018
Responsible Agency:
Cost:
Benefits:
Action Item #4:
Action Item Description:
Responsible Agency:
Cost:
Benefits:
Action Item #5:
Action Item Description:
Responsible Agency:
Cost:
Benefits:
Action Item #6:
Action Item Description:
Responsible Agency:
Cost:
Benefits:
Appendix E
Natural Hazard Mitigation Plan
Development Services & Public Works.
Consultant fee and staff time.
Will provide direction for Village budgeting and certainty for
property owners affected.
Develop a detention basin inspection and maintenance
enforcement program.
Develop a detention basin inspection and maintenance
enforcement program for all public and private stormwater
storage basins.
Development Services & Public Works.
Staff time.
Improve stormwater management in the Village.
CodeRED public outreach.
Provide public outreach to encourage all residents to sign up
and update CodeRED.
Village Manager's Office.
Staff time.
Increased number of residents reached with emergency
messages during hazardous conditions.
Maintain Volunteers 4 Lisle.
Maintain Volunteers 4 Lisle program for assistance during
emergencies and with StormReady program.
Development Services & Public Works.
Staff time.
Allows for volunteers to staff road blocks, provide door to door
contact during evacuations, freeing Police and Public Works
staff.
E-6 2018
Action Item #7:
Action Item Description:
Responsible Agency:
Cost:
Benefits:
Action Item #8:
Action Item Description:
Responsible Agency:
Cost:
Benefits:
Action Item #9:
Action Item Description:
Responsible Agency:
Cost:
Benefits:
Action Item #10:
Action Item Description:
Responsible Agency:
Appendix E
Natural Hazard Mitigation Plan
Maintain participation in StormReady.
Continue to train staff and volunteers per StormReady program
requirements, includ ing storm spotting and emergency
exerc ises .
Development Services & Public Works.
Staff time.
Train ed staff and volunteers improved our capability to predict
and respond to a weather emergency.
Maintain participation in Tree City USA.
Continue forestry program through out the community and Arbor
Day tree sale.
Public Works.
$50,000 minimum ($2 per cap ita) and staff tim e .
Improve health of Village t rees and reduce damages or roadway
debris due to falling parkway trees and branches.
Outreach program to community members and organizations
that serve indiv id uals with functional needs.
Develop an outreach program and a process to manage
community members and organizations that serve i ndividua ls
with functional needs.
Village Manager's Office & Police.
Staff time.
Avoid potential conflicts when respond ing to emergencies that
impact functional need residents, such as wheel chair bound
residents, or facilities such as local senior living facilities and an
autism day school.
Outreach for cooling and warming centers.
Provide public outreach to the residents regarding the
availability cooling or warming center during times of extended
high temperatures and severe winter weather.
Village Manager's Office & Police .
E-7 2018
Cost:
Benefits:
Action Item #11:
Action Item Description:
Responsible Agency:
Cost:
Benefits:
Action Item #12:
Action Item Description:
Responsible Agency:
Cost:
Benefits:
Action Item #13:
Action Item Description:
Responsible Agency:
Cost:
Benefits:
Action Item #14:
Action Item Description:
Responsible Agency:
Appendix E
Natural Hazard Mitigation Plan
Staff time.
Increases awareness of centers for at risk residents.
Update Comprehensive Plan.
Comprehensive plan update addressing land use of the
regulatory floodplain and coordination with the DuPage River
Feasibility Study.
Development Services.
Consultant fee and staff time.
Avoids conflicting land use recommendations in the regulatory
floodplain.
Public outreach to streamside landowners.
Develop public outreach to streamside landowners regarding
floodplain and wetland regulations, recommended
maintenance, and invasive species removal.
Development Services & Public Works.
$3,000 staff time.
Have a more educated and resilient community.
Update Village's Emergency Operations Plan.
Continue updates to Village's Emergency Operations Plan to
meet all state and federal requirements and add local flood
response planning.
Development Services & Public Works.
Staff time.
Provides a written plan for an emergency response.
Establish prioritization for floodplain acquisitions.
Establish a long-term prioritization method for implementing a
floodplain acquisition program when funds are available,
especially post-disaster funds.
Development Services & Public Works.
E-8 2018
Cost:
Benefits:
Action Item #15:
Action Item Description:
Responsible Agency:
Cost:
Benefits:
Action Item #16:
Action Item Description:
Responsible Agency:
Cost:
Benefits:
Action Item #17:
Action Item Description:
Responsible Agency:
Cost:
Benefits:
Action Item #18:
Action Item Description:
Responsible Agency:
Cost:
Appendix E
Natural Hazard Mitiga tion Plan
Staff time.
Creates a fair method of distributing funds when available for
buyouts.
Pursue mitigation funds for floodplain structure acquisition.
Pursue mitigation funds to acquire additional floodplain
residential structures.
Development Services & Public Works.
Staff time.
Reduce the cost of flooding on our community and flood
insurance program.
Outreach of summer watering restrictions.
Issue social media messages and newsletter reminders of
Village water restrictions.
Village Manager's Office & Public Works.
Staff time.
Reducing water consumption, especially during periods of
drought.
Update Property Maintenance Code.
Update Property Maintenance Code to the latest I-code.
Development Services.
Staff time.
Insures that buildings are better able to withstand severe
weather events.
Develop a written sandbag deployment policy.
Develop a written sandbag deployment policy and maintain
sandbag and barricade supplies.
Development Services & Public Works.
Staff time.
E-9 2018
Benefits:
Action Item #19:
Action Item Description:
Responsible Agency:
Cost:
Benefits:
Action Item #20:
Action Item Description:
Responsible Agency:
Cost:
Benefits:
Natural Hazard Mitigation Plan
Provid es direction for staff during emergencies.
Maintain tornado s irens.
Continue maintenance of Village owned tornado sirens.
Public Works.
$2,000 and staff time.
Insures siren is operational during a tornado warning to allow
time for people in the community to take cover.
Install staff gage on East Branch DuPage River.
In stall a staff gage at Short Street bridge on Eas t Branch
DuPage River, downstream of St. Joseph Creek confluence.
Development Services & Public Works.
$1000 and staff time.
Better predictions of levee overtopping.
VILLAGE OF VILLA PARK -Action Items
Action Item #1:
Action Item Description:
Responsible Agency:
Cost:
Benefits:
Action Item #2:
Appendix E
Implement th e projects, goals, and recommendations defined
within the Village of Villa Park Comprehensive Plan.
The Village of Villa Park has dedicated resources towards
research and plan development in areas of specific concern to
the community. Specifically, Appendix -Chapter B of the
Comprehensive Plan outlines study findings and
recommendations for the combined sewer system.
All participating agencies.
The costs associated with this action item will be project
specific.
Implementation of the recommendat ions within Appendix -
Chapter B would alleviate flooding and reduce stress on the
comb in ed sewer collection system .
Implement the projects, goals, and recommendations defined
within the Village of Villa Park Comprehensive Flood Plan.
E-10 2018
Action Item Description:
Responsible Agency:
Cost:
Benefits:
Action Item #3:
Action Item Description:
Responsible Agency:
Cost:
Benefits:
Appendix E
Natural Hazard Mitigation Plan
The Comprehensive Flood Plan, focusing on Storm Sewer
System Analysis, uses research and ca librated computer
models, to outline proposed drainage improvements projects
including: increased storm sewer s izes, constructing relief
sewers, creating flood storage in open spc:ice, providing flood
storage underground, and floodwalls.
All participating agencies.
The costs associated with th is action item will be project
specific.
Implementing the recommendations within this Plan will ass ist
the community in achieving adequate protection against a 100-
year flood event.
Implement the projects, goals, and recommendations defined
within the Sugar Creek Watershed Plan.
The Sugar Creek Watershed is located in DuPage County i n the
Villages of Villa Park and Lombard and the City of Elmhurst.
There are a number of areas within the watershed that have a
history of flooding. The flooding levels range from minor
nuisance ponding to significant flooding that causes structu ra l
damage.
All participating agencies.
The costs associated with this action item will be project
specific.
The projects outlined within this plan are expected to shorten
the duration of flooding and provide a positive means for water
to leave the problem areas after inundation peaks have
subsided.
E-11 2018
Natural Hazard Mitigation Plan
Appendix E -2017 Natural Hazard Mitigation Plan
Annual Report
DuPage County
Natural Hazard Mitigation
Appendix F
DuPage County Natural Hazard Mitigation
Workgroup
January 2018
F-1 2018
Natural Hazard Mitigation Plan
Executive Summary
The DuPage County Natural Hazards Mitigation Plan (NHMP), updated in 2012, was approved and
adopted in May 2013 by the DuPage County Hazard Mitigation Workgroup as a multi-jurisdictional
plan. For municipalities to be eligible for Hazard Mitigation grant funding, the Federal Emergency
Management Agency (FEMA) and the Illinois Emergency Management Agency (IEMA) mandate the
adoption of a hazard mitigation plan. This plan meets the mitigation planning requirements of both
FEMA and IEMA. Municipalities are encouraged to adopt the DuPage County Natural Hazards
Mitigation Plan in order to meet State and Federal requ irements.
The DuPage County Natural Hazards Mitigation Plan examines natural hazards facing DuPage County,
establishes mitigation goals, evaluates existing mitigation activities throughout the County, and
recommends additional mitigation steps that are appropriate to protect people, property and other
assets throughout DuPage County. The Plan provides the County, its municipalities, and other
participating agencies with direction for enhancing current mitigation efforts. As required by FEMA
and IEMA, mitigation plans must include actionable items that will help insure proper plan
implementation and maintenance. Chapter 9 of the DuPage County Natural Hazards Mitigation Plan
provides an "Action Plan" for implementation and maintenance.
Annual reports are intended to provide a review of the Plan direction and recommendations, a
summary of natural disasters that impacted DuPage County during the reporting year, and a re v ie w
of the action items implemented since the Plan was adopted, as appropriate.
This is the 5th and final annual report of the 2012 Natural Hazard Mitigation Plan. The DuPage County
Hazard M it igatio n Workgroup met on December 7th, 2017 and January 41h, 2018 at 421 North County
Farm Road, in Wheaton, Il linois. The 2017 Annual Report, for the reporting period of November 2016
to November 2017, is based on information collected from the State of Illinois, County Departments,
and feedback solicited from the Hazard Mitigation Workgroup.
The following Annual Report is a summary of results from the 2017 DuPage County Natural Hazard
Mitigation Plan Survey provided to all DuPage County municipalities and workgroup members.
Appendix F F-2 2018
Natural Hazard Mitigation Plan
2017 Annual Report Development
Pa rticipating agencies of the DuPage County Natural Hazard Mitigation Plan and the 2017 Annual
Report are listed below:
Loca l Municipal Jurisdictions
Addison
Bartlett
Bense nv i lie
Bloomingdale
Burr Ridge
Carol Stream
Clarendon Hills
Darien
Downers Grove
Elmhurst
Glen Ellyn
Glendale Heights
Hanover Park
Hinsdale
Itasca
Woodridge
DuPage County Departments
Lisle
Lombard
Naperville
Oak Brook
Oakbrook Terrace
Roselle
Villa Park
Warrenville
West Chicago
Westmont
Wheaton
Willowbrook
Winfield
Wood Dale
DuPage County Office of Homeland Security and Emergency Management
Du Page County Stormwater Management
DuPage County Building and Zoning
Du Page County Public Works
Appendix F F-3 2018
Natural Hazard Mitigation Pion
Review of Action Items
The Action Plan (Chapter 9) in the DuPage County Natural Hazards Mitigation Plan contains 20 action
items. These action items were taken from the hazard mitigation recommendations made in Chapters 4
through 8. Si nce the 2011-12 NHMP update, two action items have been removed and three action
items have been added to this plan. Reasoning for removal is established in action items 7 and 8. The
action items are identified as administrative, project or public information related items.
Implementation progress of the action items are summarized in the following report.
Action Items marked comp lete within the 2015 Annual Report were not changed. Action Items marked
In Progress for the current reporting period of November 2016 to November 2017 reflect only the
answers of the municipal jurisdictions and County departments and divisions whom replied to the 2017
annua l survey.
Appendix F F-4 2018
Natural Hazard Mitigation Pion
SECTION A: Administrative Action Items
Action Item 1: Plan Adoption
Action Item Description: Adopt the DuPage County Natural Hazards Mitigation Plan by resolution of the
County Board, City Councils, Boards ofTrustees, and other governing boards, as appropriate.
Status: Marked complete in 2017 annual report.
31 jurisdictions (including the County) have adopted the 2012 Natural Hazard Mitigation Plan, as shown
in Table 1.1.
Next 5 years: Every jurisdiction is expected to adopt the 2012 Natural hazard Mitigation Plan
Has your municipality adopted the 2012 DuPage County Natural Hazard Mitigation Plan?
Appendix F
ACTION rT E~i #1 P ia!'\ Aifoption Hss your muntcips lrty sdopted tll !: 2DT2 DuPsge
County N atural Hazard Mitlg1 t on Plan?
"11 ).u.o-;u"' na:, '°'11.'f'l'I ,lit) 1 .... w .. ..it,~j VI hi :.:0 1~ Ovl'll<lol C<ui~, llHMF' 11 11 4
ll ~l ~•W I
F-5 2018
Natu ra l Hazard Mitigation Plan
Action Item 2 : Continu ation of Mitigation Workgroup
Actio n Item Desc r iption: Th e County's resolution t o adopt this Plan should convert the DuPage County
Natural Hazards M itigation Workgroup to a perman ent adviso ry body. It would :
-Act as a forum for hazard mitigation iss u es,
-Disseminate hazard mitiga tion idea s and act iviti es to all particip ants,
-Allow for continued public participation in the implemen t ation and future revisions,
-En sure incorpora t ion of this Plan's goa ls and gui del ines into other planning docume nts,
-Mo nitor im plementation of this Action Plan, and
-Report on progress and recommend ed changes to the Cou nty Board and each municipality.
Status: Ongoing.
The Coun ty Board adoption reso lu tion of Novembe r 13, 2007 states tha t the "DuPage County Hazard
Mitigation Workgroup is h ereby esta blished as a permanent advisory body."
The Mitig ation Workgroup met to develop the Plan in 2007, and every year since to share infor mation
and provide input into the Annual Reports. All an nual reports are shared with the Workgroup.
Next S years: The Mitigation Workgroup has met in 2017 to deve lop an annual report to the Plan, and
will continue to meet annually.
Ac tion Item Description: The Cou nty's resolution t o adopt this Plan sho uld convert the DuPage County
Natura l Hazards M itigation Workgroup to a permanent ad vi so ry body.
Does your community plan o n participating in this Action Item?
Appendix F
ACTI ON I TEM #2: Con~nu:uion of Mitigation V/or)<g roup Ac!ior. ltem Des;c rip tion:
Th• County's ruoM.on !o sdopt ll'l <I Plan should conv~ tile DuPage ~ou n ty
Nstural Huards Mitigation Workgroup toe pe:rmaol!n ! edviso;y b!>dy. Dou your
com rnun i!y plan on particlp1t;ng In thi s Action Item?
____ ,,
F-6 2018
Natural Hazard Mitigation Plan
A ct io n Ite m 3: Pl an Mon itor in g and Ma i ntenance
Act ion Item Desc r iption: A Natura l Hazard M itigation Workgroup meet i ng will be held at least once a
year to evaluate and monitor progress on implementation . This meeting is intended to solicit the input
from multiple disciplines throughou t multiple jurisdictions of DuPage County. An annual evaluation
report will be subm itted to the DuPage County Board by the cu r ren t chair of the M itigation Wo r kgroup.
Status: Ongoing
As of 2010, the DuPage County OHSE M t ook responsibility of coordinating Workgroup meetings. The
Plan has been updated to refl ect this c hange .
Next 5 yea rs: Du Page Co unty OHS EM intend s to co n ti nu e coo rdinating mee tings.
Thi s annua l eva lu atio n r epo r t h as been pre pa r ed p er this ac ti on i tem. A mee ting o f t he Mitigatio n
W orkgroup is held ann ua lly, u sual ly in Oct ober/Novembe r .
Action Item Description: A Nat u ra l Haza rd Mitigation Workgroup meeting wi ll be he ld at least once a
year to evaluate and monitor progress on implementation. This meeting is intended to solicit the input
from mult i ple disciplines throughout multiple jurisdictions of DuPage County. An annual evaluation
report w ill be submitted to the DuPage County Boa rd by t he cu rrent chair of the Mitigation Workgroup.
Does your community plan on participating in this Action Item?
Appendix F
ACTION ITEM P.'3: Pl.an Mon'toring -and M.aln!af\1nce Ac~on lttm D•seription: A
Natura! Husrd M itigation Wori<g rcup n1uting 111.11 bt hal.d ti lust on~ a yH• to
evsluate snd monitor progrus on lmplemeriteti on 7 ni s m;ieti ng is intsnded to
sofl cit tile input from mul~p~ di>oipl;n;is 1hrough.out r11u~1plt j u cisd 1ctions of
DuPage County. Ao annual evalua.li({n repor t wifl Ile submltttd 1o the DuPage
Coul'lty Beard by tile current chair of tl'lt Mit'Qation Wori<group. Dou your
community p lan on partioipit:ng In th ls Ac~on lttlYI?
----11
F-7 20 18
Na t ural Hazard Mitigation Plan
SECTION B: Mitigation Project Action
Action Item 4: Improvement of Building Code Effectiveness Grading Schedule (BCEGS) Rating
Action Item Description: The County and most municipalities participate in BCEGS and maintain at least
a BCE GS rating of 5. Communities should strive to improve their rating to a 4, if not already attained .
Status: Ongoing.
Next 5 years: Mu nicipalities are encouraged to improve their BCE GS ratings and adopt the County
bu ild ing codes as a minimum standard.
Action Item Descript ion : The County and most municipa lities pa rticipate in BCEGS and mainta i n at least
a BCE GS rating of 5. Communiti es should strive to improve their rating to a 4, if not already attained .
Does your community plan on participating i n this Action Item?
Appendix F
AC T ION IT EM #4: Improv em ent of B uild in(t Cod• Eff•ctiv«rnus G ridinQ Scl\td u!•
~S C E GS ) Rat•ng A!)t<on ltern Oucr.pt'on: T h e Cov nty eno mo•t r.\uni cip11iti11
ps rtio;ps te In 1foJ:GS ~n d m aintain e t least a B C!;GS re tin~ of 5. Co mn\uniti es
~ho u id st>"ive to i mp (ove t'1 ei• ra ting to a 4, if n ot al ready eth \n eci . Dou your
com m·unity plan on psrlieipa ting in thi s ~.c ti o n l te~A?
Othe r
•t:S 1t !I • .. NC11 1t11 II TnL.'1' Othe r(l) ;;111
F-8 2018
Natural Hazard Mitigation Plan
Action Item 5: Urban Forestry -Participation in Tree City USA
Action Item Description: DuPage municipalities that are Tree City USA communities will maintain their
status in the nationwide program, and jurisdictions that are not in the program will consider joining the
program. It is understood that each municipality will make these considerations based on available
staffing and financial resources.
Status: Ongoing.
In the 2017 Annual Report, 99% (30/31) municipalities showed interest in participated in this program.
Next 5 years: The DuPage County Mitigation Workgroup will continue to encourage municipal
participation in Tree City USA.
Action Item Description: DuPage County municipalities that are Tree City USA communities will maintain
their status in the nationwide program. Jurisdictions that are not in the program will consider joining the
program. It is understood that each municipality will make these considerations based on available
staffing and financial resources.
Does your community plan on participating in this Action Item?
Appendix F
ACTION ITEM 115: Urb<!n Fore:Wy • Partoeipation .n Tr ee City USA Aot-<on I tem
Ducr.R!Ool'I : OuP.tga muni cipalities that ari< TrH City USA commu11ities w ill
m~inle in i.h e:ir';tet..1 s i:i tl;e nstionw\<11 progrini. Juri;tbctions th.st are not In th.a
progrsm viill consider j o inin g th e program . It i s uhderstood tilat e~ch mun•cipa!il'.f
wifl msx e lhe-oe consider at;Of!S ~esed on ava.i!e'ole ililffing ·and fin11nc it l 1E:sources _
Dou your communii'J pl11 n on parlioips t.:ng in °'is Act-oo Item?
F-9 2018
Natural Hazard Mitigation Plan
Exhibit 7 -3 lists commun ities .withi n DuPage County that pa rticipate in Tree City USA
(Arbor Day Found ation, 2017).
Exllil)it 7-3
Tree City USA Participants
Community Name Years Participated Co mmunity Name Years Participated
Addiso n 29 Lisle 25
Bensenville 26 Lombard 27
Bloomingdale 22 Nap e Ni lie 27
Burr Ridge 23 Ros elle 3·1
Clarend on Hills 27 Vi lla Paik 32
Downers Grove 33 Warrenville ·30
Elmhurst 37 Wayne 20
Glen Ellyn 33 Westmo nl 21
Glendale Heights 20 Wheaton 31
Hanover Park 32 Wood Dale 12
Hinsda le 25 \IVoodridge 26
Itasca 32
**Sta tistics token from the website: www .arb ord a y.org.
Appendix F F-10 2018
Natural Hazard Mitigation Pion
Action Item 6: Community Rating System Participation
Action Item Description: DuPage County municipalities that participate in the National Flood Insurance
Program's Community Rating System (CRS) will continue their part icipation and strive to improve their
class rating. The County and municipalities not currently involved in CRS will consider join ing the
program, though it is understood that some communities have determined that the program is not
warranted at this time.
Status: Ongoing.
The following communities currently participate in the CRS program: Addison, Bartlett, Downers Grove,
Glendale Heights, Lisle, Wheaton, Willowbrook, and Wood Dale. DuPage County (unincorporated) is
presently completing the application process.
Next 5 years: DuPage County communities not currently participating should investigate the feasibility
of participating in the CRS . Communities currently participating shou ld continue to take steps to
improve their CRS ra ting.
Action Item Description: DuPage County municipalities that participate in the National Flood Insurance
Program's Community Rating System (CRS) will continue their participation and strive to improve their
class rating. The County and municipalities not currently involv ed in CRS will consider joining the
program, though it is understood that some communities have determined that the program is not
warranted at this time.
Does your community plan on participating in this Action Item?
Appendix F
.l\CT ION ITEM #6: Cpmmunity Rs ting Sy?le~ Psrilclpation Action Item
Description. DuPage County munici pali ties that psrlicip9le in the National Fl
Insu rance Program·s Com munity Rs ti ng Syste~ (CRS) w il l continue lhei
ps;t!cipation ane1 stri•1e to i mprove tltei r cla;,s rating . The Cpu nty 3nd m .. mio\p1
not ·curr ently 11wol11ed in CRS wfll consider joini ng the pr99rs01 , !ll::nJgh lt i
underittioo ~hat some 0001munit'e5 have determ'ne.d that the pr ogram i:a n
vt9tranted at t hi.s time. Currantly, nine municipa lities psriicipsle in ·tnis p·rogr.
Does your community plan on psriicipat?ng in th is Actlon ttarn?
!• .. l ... • .. . W'(;' ...
1 N 'f'l.y.u • l"P ~"''" IJll'\Yl'IO'J f\11111• n1f;>"1~:,,,(, "" •:;'R1; II·' f'tll~ tiOr T~I Ol"11!J<t•"',-; ti"t f ""'U41"""'
f Ml !'li.t'!l IUT"10! fu•lii>l>q •c1• 0.fl.S jji 1 t l)li~'' ! I I
lJs.!g lt. ~ 001.U ~ (,({$ UPITfll~l<'J I 0 f
F-11 2018
Natural Hazard Mitigation Pion
Action Item 7: Community Rating System Information Workshop -REMOVED
Action Item Description: DuPage County should invite FEMA, the Illinois Department of Natural
Resources {IDNR), and the Insurance Services Office, Inc. {ISO) to present a workshop to the County,
municipal stormwater administrators and other interested parties on CRS. The workshop should include
an explanation of the program, annual requirements associated with participation, and an idea of
minim um credits available to DuPage County municipalities based on ongoing, countywide efforts, such
as the DuPage Cou nty Countywide Stormwater and Flood Plain Ordinance.
Status: Completed.
A CRS meeting was held in Bloomingdale on March 9th and 10th in 2011 to discuss mitigation activities. A
CRS webinar was held for DuPage County communities on August 1, 2011. Another meeting was also
held on September 22, 2011 for the CRS Group to discuss FEMA's Substantial Damage Estimator
Software. All meetings and workshops were sponsored by the Illinois Association for Floodplain and
Stormwater Management.
This action item has been accomplished and has been removed from the 2012 plan update.
Rationale: This action item was intended to be a one-time occurrence to educate potential CRS
comm unities.
Appendix F F-12 2018
Natural Hazard Mitigation Pion
Action Item 8: Property Protection Checklist -REMOVED
Action Item Description: A checklist should be prepared for use by all agencies throughout the County
for evaluating properties that are exposed to flood damage throughout DuPage County and protection
alternatives.
Status: Completed.
This action item has been removed
Rationale: The Natural Hazard Mitigation Workgroup decided to discontinue efforts in 2012.
Appendix F F-13 2018
Natural Hazard Mitigation Plan
Action Item 9: Property Protection Projects
Action Item Description: Properties that are exposed to flood damage throughout DuPage County
should be protected through property protection measures where regional structural projects are not
feasible . Property protection measures should include, but not be limited to, acquisition, elevation, or
flood proofing. Priority should be given to repetitive loss properties.
Status: Ongoing, with several completed projects.
2017
2016
Appendix F
IDNR -OWR / IE MA
Graue Mill Levee
DuPage County 2017 Strategic Plan
Purchasing repetitive loss properties and install additional water sewers, storm
sewer mains, and culverts throughout the County.
• Working to rehabi lita te damaged and aging bridges around the County.
Updating traffic signal software and installing uninterruptable power supplies
{UPS) to alleviate congestion during power outages and enhance signal
management capabilities during evacuation scenarios.
• Working to increase flood storage within the communities along the East Branch
of the DuPage River that experience frequent flood ing.
• Retrofitting Fawell Dam to allow for proper wildlife migration.
•
•
Extending current drinking water supplies to unincorporated residents .
Repair and replace aging sanitary sewer pipes, and update technology within
Wastewater Treatment Plants.
Bensenville
Financial & Technical assistance is provided to convert to overhead sewers. The
Village also has a backya rd /side yard flood alleviation program that provide
financial and technical assistance. Both programs are limited to residential
properties are on first come first serve basis due to limited budget. Both are
50/50 program. Village's participation is limited up to $7,500/each.
Downers Grove
Maintains a Community Investment Program, which includes approximately $43
million in storm water improvements from 2017 to 2021. Eleven projects are
listed, including $7 m illion in streambank improvements along St. Joseph Creek
and $60,000 (annually) for neighborhood drainage improvements cost sharing.
HUD/HMGP Flood Pron e Property Buy Outs
• Purchase of 58 flood prone structures {Countywide)
CDBG-DR (Recovery from April 2013)
$31.2 Mill ion
"'50% of Total Already Spent on Projects
CDBG-NDRC
DuPage County was eligible to submit
Damage Reports/Claims over 9000 structures
Insurance claims and loans totaled more than $65 million
F-14 2018
2014
2013
2012
Natural Hazard Mitigation Plan
Upon Successful Phase 1 application, invited back to for Phase 2 (submitted in
October)
Received pre-final approval of HMGP funding from IEMA to purchase 14 flood prone
properties as a result of the 2013 event
Includ ed Voluntary buy outs in HUD action plan(s) for a total of $5,997,000 to
potentially purchase 20+ properties
Included 25% match share of loca l IEMA HMGP match share in HUDs action plan
Purchased 3 flood prone properties countywide (to be demolished in 2013)
DuPage County submitted a pre-application for grant funding . If approved, DuPage
County may be able to purchase up to 12 homes that are on the Flood Prone Property
Voluntary Buy Out list (post 2013 flood)
Surveyed and collected data on flood prone properties to ensure exist ing list was up to
date and accurate
Next 5 years:
DuPage County will continue to work with municipalities on property protection projects
similar to those identified above.
Property Protection projects should be aligned with the overall county strategy and risk
assessment (i.e., hazard prioritization)
Projects identified by the County or municipalities will be reviewed to ens ure there are no or
little negative impacts to surrounding jurisdictions.
Action Item Description: Properties that are exposed to flood damage throughout DuPage County
should be protected through property protection measures where regional structural projects are not
feasible. Property protection measures should include, but not be limited to, acquisition, elevation, or
flood-proofing. Priority should be given to repetitive loss properties.
Does your communi ty plan on participating in this Action Item?
Appendix F
ACTION ITEM iKI: F r.op_~!y Protec~i9n Projeq;s ~.clion Item Oucripti o«1: Properties
lhat ~r e exp,oseo to flood dsmsge throughout DuP~g~ Cou nty shou ld be protected
through property protection meisures whe <e ·reg ions! stfuctu ril projecli sre not
feii~it\14~. P1ope1)' prot~ction mea:su(es shoµid i nclude, but no~ be lim.ited to ,
scquliitlon, •l&ys!ion, or ilo<>-;1-prQofing. Pri ority 6/:lould b!! giyen to repetitive loss
prop.e/tiH . Does )'our communiiy plsrt on psriioi!)abng in this Act•on t t~m?
Vot:~ !l?t;1 tfjQ 111 • \'fl'~' 1V,ll IWIY(> ~r.y •~111,to 'O'-' '"""'"' •• fl I
• 1h· Vt'll'I»"''" '°''~'wa r; lln>P,"1r °"'''\o(I .>~ •-•~"·~•ot u < 11 . "'"'''
F-15 2018
Natural Hazard Mitigation Plan
Action Item 10: Continued Watershed Management
Action Item Description: DuPage County should continue its watershed management efforts through
continued support and funding of the countywide stormwater management program, including the
regulatory efforts and watershed planning and implementation.
Status: Ongoing, with several completed projects.
Watershed planning efforts have continued within the DuPage County Stormwater Management
Division. At least two municipalities undertook detailed watershed investigations to examine localized
flooding since the DuPage County Natural Hazards Mitigation Plan development.
Several watershed projects have been completed, to include:
2016
• New Study Reaches
• Salt Creek WS
• Sawmill Creek WS
• East Branch DuPage River WS (select reaches)
• West Branch DuPage River WS (select reaches)
• West Branch Phase Ill (Warrenville)
• Effective Study Reaches
• Des Plaines River WS
• DuPage River WS
• Fox River WS
• East Branch DuPage River WS (select reaches)
• West Branch DuPage River WS (select reaches)
• Stormwater Management Program Assessment
• Stakeholder Engagement/Surveys
• Programmatic Level Analysis
• Program Cost Analysis
•HUD
• CDBG -DR (Recovery from April 2013)
• $31.2 Million
• "'50% of Total Already Spent on Projects
• CDBG-NDRC
• DuPage County was eligible to submit
• Hazard Mitigation Plan in place
• Damage Reports/Claims over 9000 structures
• Insurance claims and loans totaled more than $65 million
• Upon Successful Phase 1 application, invited back to for Phase 2
Appendix F F-16 2018
Natural Hazard M i tigation Pion
2014
• Began Springbrook #1 Watershed Plan
• Developed Stakeholder Group for Springbrook #1 Watershed Plan
• Worked with Forest Preserve & other key stakeholders to secure funding for a portion of the
Spring Brook #1 Watershed Plan's Projects
• Developed Stakeholder Group for Sugar Creek Watershed Plan
• Included Sugar Creek Watershed Projects in HUD action plan
• Initiated contract w ith consultant to begin re-evaluating East Branch DuPage River's Watershed
Plan
2013
• Contracted with consultant to begin Sugar Creek Watershed Plan
• Contracted with consu ltant to assist with modeling of Winfield Creek
2012
• Formed Winfield Creek Watershed Stakeholder Group
Next 5 years:
• DuPage County and municipalities should continue watershed management projects and
regulatory efforts.
• Several mitigation fund applications have been submitted to IEMA/FEMA for approval.
• Watershed projects should be coordinated throughout DuPage County.
Act ion Item Description: DuPage County should continue its watershed management efforts through
continued support and funding of the countywide stormwater management program, including the
regulatory efforts and watershed planning and implementation.
Does your community plan on participating in this Action Item?
Appendix F
ACTION rTEM #10: Contin ued W~tel"Shed M9n sgem enl P,.cti:ln Item Descri p tion:
DuPiagj! Cou nty s h ould contin.i~ ju water sh ed m sn .sgement effort;; tnro 1:1gh
con!in>ied support s nd fu n ding oi the co•Jntyw i de stormwgfer manage ment
prog1,am , i ncludmg th e reg1.11slory e.ffor'.3 and wat~s h ed plson irljl ·~l'.\Q
ini p:emenl9tiori . D o e~ yourcomniLlrii t_y p l9n on P~rik:i pa ting i n thi;.A ct«i ·n l !em?
F-17 2018
Natural Hazard Mitigation Pion
Action Item 11: Structural Flood Control Projects
Action Item Description: DuPage should continue the supporting and funding of feasible structural flood
control projects as they are identified in watershed plans .
Status: Ongoing, with several completed projects.
2017
2016
2014
2013
2012
Appendix F
IDNR-OWR / I EMA
• Graue Mill Levee (DuPage I Hinsdale)
Lombard
• Gatz Pond Outfall Project
Completed projects 2016:
• Armstrong Park (Carol Stream)
• West Branch Phase Ill (Warrenville)
DuPage River Feasibility Study (Began Ju ly 2016)
• Project Partners
• US Army Corps of Engineers
• DuPage County
• Wi ll County
• Project Parameters
• DuPage River Watershed
• East Branch (DuPage County)
• West Branch (DuPage County)
• Mainstem (Will County)
• Study Boundary
• Flow Rate 800cfs @ 10yr event
• Flood Related Projects
• 3 years/$3 Mill ion
-Completed the West Branch/Warrenville Phase II Project
Began Construction on the Klein Creek Flood Mitigation Project in Armstrong Park
-Submitted permit plans for Private Drive Culvert Rep lacement in Bloomingdale. This was
one of the preferred alternatives for the Springbrook/Salt Creek Watershed Plan .
-Completed the West Branch Wetland Mitigation Project in West Chicago
-Completed Brewster Creek Project
Began Construction on West Branch/Warrenville Flood Control Project Fin ished design
& permitting for Klein Creek Flood Control Proj ect/ Armstrong Park Reservoir
Began construction on Brewster Creek Flood Mitigation Project
-Completed Bower Elem entary School Berm, part of the West Branch/Warrenville Flood
Mitigation Project
Replaced Foster Ave Culvert as part of Spri ng Brook/ Salt Creek Watershed Plan
-Matchshare funded DuPage Airport Culvert Replacement/ Kress Creek Watershed
F-18 2018
Natural Hazard Mitigation Pion
Next 5 years: DuPage County should continue to support and fund feasible structural flood control
projects as they are identified in watershed plans.
Bloomingdale
• Indian Lakes Subdivision open space drainage improvements.
Glendale Heights
North Avenue flood alleviation project
Lombard
Rt 53 stormwater pumping station w ith a higher flow capacity
W infield
Determine options for the Winfield Creek Watershed
Lisle
• National Disaster Resillience Competition application for East Branch DuPage River
Watershed
Action Item Description: DuPage County should continue the supporting and funding of feasible
structural flood control projects as they are identified in watershed plans.
Is your community currently considering or have current plans for any flood control projects?
Appendix F
ACTION ITEM #,11 : Structural Flood Control Projects Aclion Item Descrlptfon :
DuPage County should continue the supporting and funding of feasible structural
flood ~ontrol projects as they are identified in watershed plans. Is your community
currenuy conside ri ng or have current plans for ~ny flood control projec ts?
'•
F-19 2018
Natural Hazard Mitigation Plan
Action Item 12: Stream Maintenance Programs
Action Item Description: The County, municipalities, and institutions should develop and implement a
formal and regular drainage system maintenance program. This effort should include the inspection of
privately mainta i ned drainage facilities. It is understood that each municipality w ill make these
considerations based on available staffing and financial resources.
Status: Ongoing, with several completed projects.
Next 5 years: Continue to implement a formal and regular drainage system maintenance program.
Action Item Description: The County, municipalities, and institutions should develop and implement a
formaf and regular drainage system maintenance program. This effort should include the inspection of
privately maintained drainage facilities. It is understood that each municipality will make these
considerations based on available staffing and financial resources.
Does your community plan on participating in this Action Item?
Appendix F
ACTION ITEM #12 ; Stream Mai ntenance Programs Acti on Item Description: The
County, mun1clpa lilies, and institutions shou ld develop.and implement a forma l and
regular drainage system maintenance program. This effort should include the
inspection of privately maintai n.ad drainage facJlilies . It is understood that each
municipal ity wm make these .considerations based on available staffing and
financial resources . Does your community plan on partictpallng In this Action Item?
..
V ES t (jJ'I~)
F-20 2018
Natural Hazard M i tigation Plan
Action Item 13: Participation in StormReady
Action Item Description: DuPage County communities, other agencies, and colleges shou ld maintain
their status, o r consider joining the National Weather Service's StormReady program. The Storm Ready
program has been developed to provide communities with guidelines to improve the timeliness and
effectiveness of public warning systems for hazardous weather.
Status: Ongoing.
DuPage County OHSEM has maintained Storm Ready certification and was re -certified in 2014 .
Next 5 years: DuPage County OHSEM p lans on continuing participation in Storm Ready. All DuPage
County municipalities should take steps to become Storm Ready.
Action Item Description: DuPage County communities, other agencies, and colleges should maintain
their status, or consider joini ng the National Weather Service's Storm Ready program. Currently the
County and seven communities within DuPage County are Storm Ready. The Storm Ready program has
been develo ped to provide communities with guidelines to improve timely and effective public warning
systems for hazardous weather.
Does your community plan on participating in this Action Item?
Appendix F
ACTION ITEM #13:· Parti cipation in StormReady Action ltem Descripti on: OuPa.9e
County communities, othe r aoencies, and colleges should 111~i nla i n the ir status, or
consider jo ining the Nationa l Weather Service's StormReady program. Currentty
the Counr; and. seven· communities with in DuPage Coun'7' are StormR~ady. The
StormReady prog ram has been developed to provide com munities \Wth gui de li nes
to improve timely and effective public warning systems for hazardous We?it.tier:
Does your co mmunity pl~n on pa rtJ cipatlnQ ·1n th is Action Item?
F-21 2018
Natural Hazard Mitigation Plan
Action Item 14: Identification of Floodplain Structures
Action Item Description: A comprehensive list of structures located in the County's floodplain s should be
developed. The County continues to exam ine building footprints and floodplains, as part of the
stormwater management program, a determination of the number of flood p lain structures should be
made. The develope d information should be provided to communities, as appropriate.
Status: Ongoing.
DuPage County Stormwater is currently working with the DuPage County GIS department.
Next 5 years: Continue development
Action Item Description: A comprehensive list of structures located in the County's floodplains should be
developed. The County continues to examine building footprints and floodplains, as par t of the
stormwater management program. A determination of the number of floodplain structures should be
made. The developed information should be provided to communities, as appropriate.
Does your community plan on participating in this Action Item?
Appendix F
ACTION ITEM #14: Identification of Floodplain Structures Adion Item Descrlptlon:
A comprehensive list .of structures located in the .county's noodplalns should be
develope d. The Collnty continues to exami ne building footprJnts and ftoodplalns .
as part of the stormwater management program. A determination of the number of
floodplain structures should be made. The developed Information should be
provided ·to communities , as appropriate. Does.your community plan on
participating in tliis Action Item?
F-22 2018
Natural Hazard Mitigation Plan
Action Item 15: Review of Critical Facilities
Action Item Description: The location of critical facilities should be evaluated to determine if they are
located in flood prone areas or other hazardous locations. Critical facilities have been mapped by the
County's GIS Department. As the County further examines bui lding footprints and floodplains as part of
the storm water management program, the review of critical facilities should be included. Where
necessary, critical facilities should be protected from identified natural hazards.
Status: Ongoing .
DuPage County has worked with municipalities to identify Cr itical Faci lities since 2007. DuPage County
GIS has worked with municipalities over the last few years to identify cr itical infrastructure within their
jurisdiction . County GIS has recently updated their mapping service for municipal users .
NextS years: DuPage County to continue and update critical facility information as identified.
Action Item Description: The location of critical facilit ies should be evaluated to determ ine if they are
located in flood prone areas or other hazardous locations. Critical facilities have been mapped by
DuPage County's Geographical Information System department. As the County further examines
building footprints and floodplains as part of the stormwater management program, the review of
critical facilities should be included . Critical facilities should be protected from identified natural hazards
as necessary.
Does your community plan on participating in this Action Item?
Appendix F
ACTION ITEM #15: Review of Critical F~dlities Action Item Descrip ti on : Tl1e
1ocallon of cri iical faciliti~s shoul(I be evalu~ted to de terilline if they are lo~aJed in
flood prQhe areas or otMr hazardous locations. Crit ic.al tacu nies h(lve be~n
mapped by bup~ge Gountj'·s Geograph ical lnforina ti on System department . As
the County further exarnines building footprinls and floodplains as part of lhe
stortnwafe r management progra'.m, the review of criti tal facilit [es should oo
included. Crii ical faciliMs should be protected from iden tified natural haz~rds as
necessary. Do ~s your community plan on participating 'in th is Action item?
'-----r,~
F-23 2018
Natural Hazard Mitigation Pion
Action Item 16: Development of Flood Stage Maps
Action Item Description: Flood stage maps should be developed to show varying depths of flooding and
the respective area of inundation for floodplain areas. The maps should be developed by watershed.
Status: Ongoing.
DuPage County Stormwater is currently working with the DuPage County Geographic Information
Systems (GIS) department to develop detailed DuPage County specific flood maps. At present date, the
County website has published a prelimary Digital Flood Insurance Rate Map (DFIRM); these maps have
also been published by the Federa l Emergency Management Agency (FEMA) and the Illinois State Water
Survey (ISWS) department.
Next 5 years: Continue to maintain flood stage maps.
Action Item Description: Flood stage maps should be developed to show varying depths of flooding and
the respective area of inundation for floodplain areas. These maps should be developed by watershed.
Does your community plan on participating in this Action Item?
Appendix F
ACTION ITEM ff16: D~velopment of Flood Stage Maps Action Item Desqiptlon:
Flood stage maps sho1,1td be <teveloped to show var1ing ~epths of flooding and the
respective area of inundation for rto odpl~in areas. Tu.ese maps sholtld be
develope~ by wat~rshed. Does your CQmmunity plan on participating in U'lis Action
!tern?
,~ 111\ll\1 1 "'1:•11ir ... ,
F-24 2018
Natu ral Hazard Mitigation Plan
Action Item 17: Seek Mitigation Grant Funding for Additional Mitigation Planning Cost
Beneficial Projects
Action Item Descri ption: Th e County, munici paliti es , fire protection distric ts, and educa tional institutions
should apply for m itiga tion gr ant funding throug h ava il ab le IEMA and FEMA programs for mitigation
plann ing and m it igation projects.
Status: Ongoing.
In 2016, D uPage County OHSEM utilized Hazard Mitigation Grant Program (HMGP) funds t o conduct a
fu ll-scale rail I hazardous materials exercise in conjunction with Tetra Tec h and Downers Grove. In 2017,
The State of Illin ois utilized additional HMGP funds to conduct a Statewide commodity fl ow study that
will be shared with a ll Illino is co unties that focused on the transportation of h azardous materials.
Out of the 2017 Annual Sur vey r espo ndants, th ree municipal j urisdictions id e ntified r eceiving mitigation
grant dollars in the past year:
Winfield
Repetitive Flood Claims (RFC), $320,000 to assist in buying floodprone property.
Vi lla Park
CDBG ·DR, $1,000,000 for Washington Street Green Storm Water lnfrastrucure
Addison
Disaster Recovery (HUD), re ce ived $189,000 for buyout of one fl ood prone property.
Next 5 years: Continue to apply for grant fun d ing for add itio na l mitigation planning projects.
Action Item Desc ri ption: The County, municipalities, fire protection districts and educational institutions
shoul d ap ply for mitigation grant f un ding through available I EMA and FEMA programs for m itigation
planning and mitigation projects. As requi red by IEMA and FEMA programs, projects must be cos t
be net i cia I.
Does your community plan on participating in this Ac tio n Item?
Appen dix F
ACTION ITEM #17:Seel< Mitig ation Gra nt Funding for Additional Mitigation
Planning Cost Benefi cial Projects Action Item Descrip Uon: The ·county.
munfclpalilles, fire protecfi on districts and educational institutions shou ld apply for
mftlgatron grant iuncl ing th ro ugh available IEMA and F~MA programs for mitigation
planning and mitigation projects. As req uired by IEMA and FE MA programs.
projects would need to be cost beneficia L Does xour commun ity plan on
participating in th is Actio n Item?
F-25 2018
Natural Hazard Mitigation Plan
C. Public Information Action Items
Action Item 18: Development of a Public Information Strategy
Action Item Description: A countywide natural hazards public information strategy should be developed
for the use of the County, municipalities, and institutions. The strategy should be consistent with the
recommended approach for the CRS program. The most important topics to cover are:
Safety
• During thunderstorms and lightning
• During winter storms
• Tornado safety precautions
• Emergency protection measures
Protecting your property
• Sewer backup protection measures
• Yard drainage issues
• Sources of assistance
Understanding floods
• Why there are floods
• Why we regulate the floodplain
• Flood insurance
Protecting our watersheds
• Benefits of open space
• Protecting wetlands
• Protecting water quality
• Stream and wetland dumping issues
The most appropriate ways to provide information are:
• Community newsletters
• Mailings to residents
• Websites and links to other sources
• Newspaper articles
• Cable television access
Publications developed by other agencies should be reviewed, consolidated, and tailored for distribution
to DuPage County property owners. A set of countywide publications should be developed that can be
used by communities as is, but developed in a format that allows communities to customize the
materials.
Status: Ongoing .
Appendix F F-26 2018
Natural Hazard Mitigation Plan
DuPage County continues to utilize its emergency website: www.protectdupage.org to provide County
communities and residents with the most up to date emergency information on any hazard affecting
DuPage County.
Communities are encouraged to link to www.protectdupage.org to maintain a consistent, single source
of emergency information. The County also provides emergency information on Facebook and Twitter.
DuPage County OHSEM has developed a County Joint Information Center and Joi nt Information System
to support media messaging during an eme rg ency/disaster. Staff members identified from various
County departm ents have been appo in ted to a pub lic information team.
Approved publica tions are made available on the county website.
Next 5 years: DuPage County should continue conducting training and exercises involving public
information components.
Municipalities with mitigation information on websites should stay consistent or link to the County
website: www.dupageco.org or www.protectdupage.org (during emergencies).
Action Item Description: A countywide natural hazards public information strategy should be developed
for the use of the County, municipalities, and institutions. The strategy should be consistent with the
r ecommended approach for the CRS program. Public information topics are available from the County.
Does your community plan on participating in this Action Item?
Appendix F
ACTION ITEM #18 : Development or a Plib li c lnfom1ati on Strata.gy Action Item
Description: A countywide natural nazarcls pub l!c information strategy should be
developed for ll1e use of the County, mlfnidpalities , and insti tutions. The strategy
should be consistent with the recommended approach for the CRS program . Public
information topics are available from the Cbunt'/. Does your community plan on
partic ipati ng in this Action ttem?
F-27 2018
Natural Hazard Mitigation Pion
Action Item 19: Property Protection References
Action Item Description: Provide municipal departments, libraries and other interested offices with a l ist
of references on property protection that can be ordered for free from state and federal offices. Include
a request that they make the references available for public use. A special effort should be made to
identify references on insurance, emergency preparedness and property protection.
Also, identify websites that provide property protection information and provide their addresses to the
County and municipal webmasters.
Status: Ongoing.
The OHSEM websites (www.dupageco.org/oem and www.protectdupage .org ) contain information on
natural hazards, including reference material to State and Federal sources. Stormwater has developed
mitigation reference brochures that have been distributed throughout DuPage County for residents to
utilize.
Next 5 years: These websites should be maintained and updated as necessary.
Action Item Description: Provide municipal departments, libraries and other interested offices with a list
of references on property protection that can be ordered for free from state and federal offices. Include
a request that they make the references available for public use . A special effort should be made to
identify references on insurance, emergency preparedness and property protection. Also, identify
websites that provide property protection information and provide their addresses to the County and
municipal webmasters.
Does your community plan on participating in this Action Item?
Appendix F
AGTION ITEM #19: Property Protection References Ac ti 9n Hem Description:
Prov id~ rhun lcipal departments. !ibrarfes and othe r in1ereste~ offices Vi~!h ·a Hst of
references on property protection that Cf!ll be ordered for fr~e from s!afe and
federal offices. Include a reque?{ that they make the references ava ilab le for pub lic
Uf?e. Aspecial effort.sh·oul(I he ma(le to i(1en.tify references on insUr(!ric~.
er'nergeney preparedness an.d properly pr9 tection . ~lso, identity v~eb i;ites that
prt)vide property prbtedion informau-011 and provide-their addresses io the Colmty
and municipal webniasters . 0.oes your community plan on pprticip·aun9 in this
Action Item?
VES(l ~l
F-28 2018
Natural Hazard Mitigation Plan
D. Additional Action Items
Action Item 20: Backup Generation for Critical Facilities
Action Item Description: County and municipal jurisdictions should supply backup generation capability
to critical facilities. Backup generation of critical facilities such as hospitals, nursing homes, and first
response faci lities helps ensure the mission of lessening the effects of a disaster. DuPage County and
local Emergency Management agencies are to coordinate with various appropriate agencies.
Status: Ongoing.
Action Item Description: County and municipal jurisdictions should supply backup generation capability
to critical facilities.
Does your community plan on participating in this Action Item?
Appendix F
ACTION ITEM #20 : Bacl<up Generation for Cri ti ca l Fadmi~s .Action Item
Descciption : County and municipa) juri'sd ictions should supply backup genera !ion
capability to Clitical facilities. Does your community plan on participating in this
Actj on Item?
y£:S,1!fr ~I
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• Plll'Kllr 1(1 ·••lllla bln fu.1d ll1y Ol l.)11!.11l 10 !>01JI CQ'I l h.11 ~"' :..,11•ahl• (1 ••1
U ~lo t'IO!! glil•l bl!IJCl/U. Il l 0 11 1111.m lcipal ''1•1\oJCll l ::u~•·h~ p-.'.1
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F-29 2018
Natural Hazard Mitigation Plan
Action Item 21: Construction of Safe Rooms
Action Item Description: County and municipal jurisdictions should develop safe rooms or tornado
shelters within wind -vulnerable structures. Wind -vulnerable facilities a re particularly susceptible to
tornadoes and storms with high wind speeds. Construction of Safe Rooms and/or tornado shelter areas
in or around these facilities has the potential to save lives. The County and municipa l building code
departments are responsible for these updates.
Status: Ongoing.
Action Item Descriptions: County and municipal jurisdictions should develop safe rooms or tornado
shelters within wind-vulnerable structures. Standards and construction for safe rooms in new or
establ ished building codes is preferred over mandatory retrofitting.
Does your community plan on participating in this Action Item?
Appendix F
ACTION ITEM #21: Construction of Safe Rooms Action Item Descriptions: County
and mun icipal jurisd ictions should. develop safe rooms or tornado shelters within
wind-vulnerab le. struct1,1res. Standards and construction for s<;ite rooms in new or
established bllilcl ing co~es is preferre<;I over mandaloiy retrofitting . Does your
community plan on p.a(li~ipating in th is Action llem?
F-30 2018
Natural Hazard Mitigation Plan
Action Item 22: National Floodplain Insurance Program (NFIP) Compliance
Action Item Description: All municipalities within DuPage County have floodplain ordinances that are at
or above FEMA standards. Over the next five years, all communities should continue adopting
ordinances compliant with FEMA standards. Maintaining floodplain ordinances at or above the FEMA
standards ensures that DuPage County jurisdictions maintain good standing in the National Flood
Insurance Program . This in turn provides residents with improved options for obtaining flood insurance
for homes within a flood plain. Municipal and County Stormwater and Building departments are
res ponsib le for these updates.
Status: Ongoing.
Action Item Description: All municipalities within DuPage County have floodplain ordinances that are at
or above FEMA standards. Over the next five years, all communities should continue adopting
ordinances that are compliant with FEMA standards.
Does your community plan on participating in this Action Item?
Appendix F
ACTION ITEM #22: National Floodpla in ln ?u ran~ Program (NFI P) Compliance
Action Item Description ; Afl murii cipal ities .~vith fn Ot,rPage County have floodplain
9rd i na.nc~s ~ha~ are at or ~bove FEMA stimdards .. Over ~he next fiv~ years, all
~ommunities shou ld eonllnue adop ting orcliriances tha! are compliant with FEIViA
standards. Does your community plan on partidpating in this Action 11elJ'I?
F-31 2018
Natural Hazard Mitigation Plan
Summary
The continuation of the DuPage County Natural Hazard Mitigation Workgroup is necessary for
implementation of the Action Plan. The establishment of the Mitigation Workgroup as a permanent
group is proposed to monitor the implementation of the Plan, report to the County Board,
municipalities, other agencies, and colleges on its progress, and recommend revisions to this Plan as
needed. This is explained in Action Item 2.
Maintena nee and monitoring of the DuPage County Natural Hazards Mitigation Plan are addressed in
Action Item 3 . This Action Item explains how and when this Plan will be reviewed, revised, and
updated. While Action Item 3 calls for the Mitigation Workgroup to meet at least once a year, it is
anticipated that they will meet more frequently through the Stormwater Administrators' meetings and
the Local Emergency Managers Coordinators group. The purpose of the M itigation Workgroup meetings
will be for the development and review of countywide mitigation activities.
Appendix F F-32 2018