R-1275 - 06/11/2013 - DUPAGE COUNTY - Resolutions Supporting DocumentsITEM 6.F.11)
AGENDA ITEM
Regular Board of Trustees Meeting
of
June 11, 2013
SUBJECT: DuPage County Natural Hazards Mitigation pP,,l�an
FROM: Blaine Wing, Assistant Village Manager `V'
BUDGET SOURCEAMPACT: N/A
RECOMMENDED MOTION: I move that the Village Board approve Resolution 2013 -DU-
EM -R -1275, which adopts the newest DuPage County Natural Hazards Mitigation Plan as the
official plan of the Village of Oak Brook.
Background:
On August 22, 2006 and then on January 22, 2008, the Village adopted resolutions regarding the
undertaking by the DuPage County and its municipalities of a Natural Hazards Mitigation Plan.
Since that time, various staff have attended meetings and participated in the development of the
2012 DuPage County Natural Hazards Mitigation Plan.
The plan was developed and updated because DuPage County is subject to a variety of natural
hazards that threaten life and health, and can cause millions of dollars of property damage.
DuPage is vulnerable to floods, tornadoes, earthquakes, severe summer storms, heavy snow, ice
storms, and more. While natural hazards are acts of nature, there are things that can be done to
mitigate their impact on residents, public facilities, and private property.
The updated plan meets the new state and federal requirements, and thus needs to be adopted in
order for the Village of Oak Brook, our residents, and businesses to remain eligible for grant
funding. Attorneys from Holland & Knight have reviewed the DuPage County Natural Hazards
Mitigation Plan and have created the attached resolution. A copy of the 200+ page plan is
available at Village Hall and is available online via DuPage County's website.
Recommendation:
Staff recommends that the Village Board approve the attached resolution.
A rvk
RESOLUTION 2013- DU -EM -R -1275
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, and extreme heat events; and
WHEREAS, natural hazards can damage property, close businesses, disrupt traffic, 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 "DuPage
County Natural Hazards Mitigation Plan of 2012," ( "Plan") to be adopted by the participating
municipalities in DuPage County; and
WHEREAS, the Village participated in the development of the Plan; and
WHEREAS, by adopting the Plan, the Village will satisfy the FEMA requirement to be eligible for
federal mitigation funds;
NOW, THEREFORE, be it resolved by the President and Board of Trustees of the Village of Oak
Brook, DuPage and Cook Counties, Illinois, as follows:
Section 1: Recitals. The foregoing recitals are hereby incorporated into, and made a part
of, this Resolution as the findings of the President and Board of Trustees of the Village of Oak Brook.
Section 2: Adoption of the Plan. The Plan is hereby approved and adopted in its entirety.
Section 3: Repealer. The natural hazard mitigation plan adopted by the Village pursuant to
Resolution 2008- DU -EM -R -1004 shall be; and is hereby, repealed in its entirety and shall no longer be in
force and effect.
Section 4: Effective Date. This resolution shall be in full force and effect immediately upon
its passage and approval in the manner provided by law.
[SIGNATURE PAGE FOLLOWS]
APPROVED THIS 11111 day of June, 2013
PASSED THIS 1111 day of June, 2013
Ayes:
Absent:
Gopal G. Lalmalani
Village President
ATTEST:
Charlotte K. Pruss
Village Clerk
Resolution 2013- DU- EM -EX -R -1275
Du Page Mitigation Plan
Page 2 of 2
DuPage County, Illinois
Natural Hazards Mitigation Plan
Including:
Village of Addison
Village of Bartlett
Village of Bensenville
Village of Bloomingdale
Village of Burr Ridge
Village of Carol Stream
Village of Clarendon Hills
City of Darien
Village of Downers Grove
City of Elmhurst
Village of Glendale Heights
Village of Glen Ellyn
Village of Hanover Park
Village of Hinsdale
Village of Itasca
Village of Lisle
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
City of West Chicago
Village of Westmont
City of Wheaton
Village of Willowbrook
Village of Winfield
City of Wood Dale
Village of Woodridge
DuPage County Hazard Mitigation Workgroup
November 2012
Natural Hazards Mitigation Plan
DuPage County
Natural Hazards Mitigation Plan
Contents
November 2012
Executive Summary
Page Number:
Chapter 1. Introduction ............................................... ............................1-1
1.1 Overview
1.2 Planning Approach
1.3 DuPage County
1.4 Land Use and Development
1.5 Critical Facilities
Chapter 2. Hazard Analysis ......................................... ............................2 -1
2.1 Natural Hazards
2.2 Assets and Property Value
2.3 Floods
2.4 Severe Summer Storms
2.5 Severe Winter Storms
2.6 Tornado
2.7 Extreme Heat and Drought
2.8 Other Natural Hazards
2.9 Summary - Impact of the Hazards
2.10 Conclusions
2.11 References
Chapter3. Goals .......................................................... ............................3 -1
3.1 Community Priorities
3.2 Plan Direction
3.3 Goals and Guidelines
3.4 County and Municipal Planning Goals
Chapter 4. Preventive Measures ................................ ............................4 -1
4.1 Building Codes
4.2 Planning and Zoning
4.3 Subdivision Regulations
4.4 Open Space Preservation
4.5 Stormwater Management
4.6 Wetland Protection
4.7 Stream Restoration
4.8 Hazard Mapping
4.9 Urban Forestry
III November 2012
Natural Hazards Mitigation Plan
4.10 Dumping Regulations
4.11 Manufactured Homes
4.12 Conclusions
4.13 Recommendations
4.14 References
Chapter 5. Property Protection ................................... ............................5 -1
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
5.8 References
Chapter 6. Structural Projects ............................. ............................. ...... 6 -1
6.1 Reservoirs and Detention
6.2 Levees and Barriers
6.3 Channel Improvements and Diversions
6.4 Crossings and Roadways
6.5 Drainage and Storm Sewer Improvements
6.6 Drainage System Maintenance
6.7 DuPage County Planned Structural Projects
6.8 Conclusions
6.9 Recommendations
6.10 References
Chapter 7. Emergency Services .................................. ............................7 -1
7.1 Preparedness - Planning
7.2 Preparedness - Threat Recognition
7.3 Warning
7.4 Response
7.5 Critical Facilities Protection
7.6 Post Disaster Recovery and Mitigation
7.7 Conclusions
7.8 Recommendations
7.9 References
Chapter 8. Public Information .................................... ............................8 -1
8.1 Outreach Projects
8.2 Library and Web Sites
8.3 Technical Assistance
8.4 Real Estate Disclosure
8.5 Public Information Program Strategy
8.6 Conclusions
8.7 Recommendations
8.8 References
iv November 2012
Natural Hazards Mitigation Plan
Chapter 9. Action Plan ................................................ ............................9 -1
9.1 Action Plan Overview
9.2 Mitigation Action Items
9.3 Summary of Action Plan Items
9.4 Plan Implementation and Maintenance
Appendices
Appendix A — Workgroup Participants
Appendix B — Public Involvement Activities
Appendix C — Community Resolutions (Examples)
List of Tables
1 -1 DuPage County Natural Hazard Mitigation Workgroup
1 -2 DuPage County Community Information
1 -3 DuPage County Population and Land Area Information
1 -4 DuPage County Major Employers
1 -5 DuPage County Land Uses
2 -1 State and Federal Disaster Declarations for DuPage County
2 -2 DuPage County Identified and Potential Hazards
2 -3 DuPage County Workgroup Ranking of Identified and Potential Hazards
2 -4 DuPage County Estimate of Assets
2 -5 Estimate of Housing Units per Community
2 -6 DuPage County Median Home Prices
2 -7 DuPage County Watersheds
2 -8 DuPage County 100 -year Flood Elevations
2 -9 DuPage County Comparison of Flood Elevations
2 -10 DuPage County Recorded Flood Events
2 -11 Buildings Located in DuPage County 100 -year Floodplains
2 -12 Estimate of DuPage County Flood Vulnerability
2 -13 DuPage County Flood Insurance Claims Summary
2 -14 DuPage County Flood Insurance Claims Activity (1978 -2005)
2 -15 DuPage County Hail Events From
2 -16 DuPage County Hail Event Details
2 -17 DuPage County Frequency of Severe Summer Storms
2 -18 DuPage County Recorded Winter Storm Events
2 -19 DuPage County Recorded Tornado Events
2 -20 DuPage County Recorded Heat and Drought Events
2 -21 Recent Earthquakes Felt in Illinois
2 -22 Summary of DuPage County Hazards
4 -1 Building Codes Used in DuPage County and BCEGS Ratings
4 -2 DuPage County Planning and Land Use Ordinances
4 -3 DuPage Countywide Stormwater and Flood Plain Ordinance Waiver
Status
v November 2012
Natural Hazards Mitigation Plan
4 -4 Tree Cities USA in DuPage County
4 -5 DuPage County Communities the Prohibit Dumping in Streams
5 -1 DuPage County Flood Prone Property Acquisitions
5 -2 DuPage County Floodproofing Assistance Efforts
6 -1 DuPage County Watershed Plans
6 -2 DuPage County Detention Projects — Constructed
6 -3 DuPage County Levee and Barrier Projects — Constructed
6 -4 DuPage County Channel Improvement Projects — Constructed
6 -5 DuPage County Bridges and Roadways That Potentially Impede Flood
Flows
6 -6 DuPage County Drainage System Maintenance
6 -7 DuPage County Planned Stormwater Management Projects With
Identified Funding Sources
6 -8 DuPage County Planned Stormwater Management Projects Without
Funding
7 -1 Flood Forecast and Rain and Stream Gage Links
7 -2 DuPage County Rain and Stream Gages
7 -3 Community Emergency Flood Procedures and Mitigation Actions
8 -1 DuPage County Community Newsletters
8 -2 DuPage County Library Information and Web Sites
9 -1 Action Items, Responsible Agencies and Deadlines
9 -2 Action Items, Goals and Guidelines
List of Exhibits
1 -1
Map of DuPage County Townships
1 -8
1 -2
Map of DuPage County Municipalities
1 -9
1 -3
Map of DuPage County Watersheds
1 -10
1 -4
DuPage County Population Density by U.S. Census Tract
1 -12
2 -1
Map of DuPage County Watersheds
2 -10
2 -2
DuPage County Rain and Stream Gage Locations
2 -14
2 -3
East Branch DuPage River at Lisle, Gage Description
2 -15
2 -4
Isohyets of the July 1996 Rainfall
2 -20
2 -5
DuPage County 100 -year Floodplains
2 -24
2 -6
DuPage County Hail Recorded Events
2 -31
2 -7
Illinois Average Snowfall
2 -35
2 -8
DuPage County Recorded Tornado Occurrences
2 -42
7 -1
DuPage County Rain and Stream Gage Locations
7 -4
vi November 2012
Natural Hazards Mitigation Plan
Chapter 1 — Introduction
1.1 overview
DuPage County, Illinois, is subject to natural hazards that threaten life and health, and
have caused extensive property damage. Major floods struck in 1972, 1974, 1976,
1987, 1996, 2008, and 2010. The County has taken significant steps to mitigate
against future flood damage since the 1987 flood; however, more remains to be done.
Tornadoes caused damage in 1967, 1976 and 1996. Blizzards and snowstorms
impacted the County in 1979, 1999, 2001, and 2011. To address the potential impact
and mitigation opportunities of these and other natural hazards DuPage County and the
participating municipalities, agencies and institutions have developed this Natural
"Hazard mitigation is
defined as any sustained
action taken to reduce or
eliminate long -term risk to
life and property from a
hazard event."
Hazards Mitigation Plan in 2007, and have updated the plan
in 2012. This plan expands and builds off of the foundation
created in 2007.
"Hazard mitigation" does not mean that all hazards are
stopped or prevented. It does not suggest complete
elimination of the damage or disruption caused by such
incidents. Natural forces are powerful and most natural
hazards are well beyond our ability to control. Natural
hazards can be compounded manmade hazards and vice
versa. Hazard mitigation does not mean quick fixes. Hazard mitigation means a long-
term, permanent approach to reduce hazard vulnerability. Hazard mitigation also means
a comprehensive approach to minimizing the impact of hazards.
Purpose of Planning: Every community must address natural hazards. Every community
has different resources and interests relating to natural hazards. There are many ways to
deal with hazards, there are many agencies that can help, and there are many solutions
for managing or mitigating hazards.
Planning is one of the best ways to assess hazards and resources in order to produce a
long -term sustainable program of activities that will best mitigate the impact of hazards
and, often times, meet other needs. A well - prepared plan will ensure that all possible
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.
Mitigation activities need funding. A mitigation plan is now a requirement for Federal
mitigation funds. Section 104 of the Disaster Mitigation Act of 2000 (42 USC 5165)
states that after November 1, 2003, local governments applying for pre-disaster
mitigation funds must have an approved local mitigation plan. Also, since November 1,
2004, a plan is needed for post- disaster mitigation funds under the Hazard Mitigation
Grant Program. These requirements are contained in 44 CFR (Code of Federal
Regulations) Part 201.
Introduction 1 -1 November 2012
Natural Hazards Mitigation Plan
Therefore, a mitigation plan will both guide the best use of mitigation funding and meet
the prerequisite for obtaining such funds from the Federal Emergency Management
Agency (FEMA). FEMA also recognizes plans through its Community Rating System, a
program that reduces flood insurance premiums in participating communities.
Purpose of this P lan. 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 six major natural hazards
facing DuPage County: floods, winter storms, tornadoes, severe summer storms,
earthquakes, and extreme heat. The Plan also attempts to address a major secondary
effect of these natural hazards: power outages.
This Plan fulfills the federal mitigation planning requirements for mitigation funding, and
it provides the County, municipalities, agencies, and institutions with a blueprint for
reducing the impacts of these natural and manmade hazards on people and property.
1.2 Planning Approach
This Plan reviews mitigation alternatives and selects those that will work best for DuPage
County and participating municipalities, agencies, and institutions. It provides carefully
considered directions to the County government and to the participating municipalities by
studying the overall damage potential and ensuring that public funds are well spent.
Mitigation Workgroup: This 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 and colleges within DuPage County were
invited to participate. Interested municipalities passed a resolution stating their
commitment to the plan development. The Workgroup's members include
representatives of County offices, interested municipalities, fire protection districts and
the College of DuPage.
Most members of the Workgroup are municipal representatives to the stormwater
ordinance administrator's workgroup, coordinated by the DuPage County Stormwater
Management Division, and /or the Local Emergency Managers Coordination (LEMC)
group, sponsored by the DuPage County Office of Homeland Security and Emergency
Management. The member organizations and primary representatives who attended
Mitigation Workgroup meetings are shown in Table 1.1. All participants are listed in
Appendix A. In 2010, the DuPage County Office of Homeland Security and Emergency
Management took over coordination of the Hazard Mitigation Workgroup.
The Workgroup met nine times during the eleven month period from May 2006 through
April 2007. It reviewed the hazards and their effects on people and property, considered
a variety of ways to reduce and prevent damage, and recommended the most appropriate
and feasible measures for implementation. Annually since 2007, the Workgroup has met
to discuss and document the required Annual Reports,
Introduction 1 -2 November 2012
Natural Hazards Mitigation Plan
Technical support for the planning effort was provided by the DuPage County Stormwater
Management Division and Molly O'Toole & Associates, Ltd., a hazard mitigation planning
consulting firm.
Table 1 -1 — 2012 Natural Hazard Mitigation Workgroup Members
DuPage County
Natural Hazards Mitigation Workgroup
DuPage County Departments
Agency
Representative
Homeland Security and Emergency
David Bunge
Management
Safia Rabah
Stormwater Management
Sarah Ruthko
Mary Mitros
Jamie Geils
Public Works
Greg Phillips
Economic Development
Jeri Boyer
Jim Stran
Clayton Heffter
Forest Preserve
Brock Lovelace
Municipalities
Bob Nissen
Village of Addison
Rick Federighi
Kai Liu
Mike McGuigan
Village of Bartlett
Brian Goralski
Steven Bosco
Village of Bensenville
Don Schultz
Village of Bloomingdale
Michael Marchi
Village of Burr Ridge
Tim Vaclav
Village of Carol Stream
Jim Knudsen
Village of Clarendon Hills
Dan Underleider
City of Darien
Gerry Piccoli
Village of Downers Grove
Karen Daulton Lange
Nathaniel Hawk
City of Elmhurst
Don Novak
John Hanson
Village of Glendale Heights
Steve Ewoldt
Roy Charvat
Village of Glen Ellyn
Bob Minix
Dave Buckley
Village of Hanover Park
Tom Cortese
Howard Killian
Village of Hinsdale
Kevin Votava
Dan Deeter
Village of Itasca
Scott Heher
Village of Lisle
Jason Elias
Introduction 1 -3 November 2012
Natural Hazards Mitigation Plan
Introduction 1 -4 November 2012
Mary Lou Kalsted
Randall Johnson
Village of Lombard
Doug Cail
Jana Bryant
City of Naperville
Dan Nelson
Michael Hullihan
Village of Oak Brook
Blaine Wing
Michelle Ruska
City of Oakbrook Terrace
Todd Kupsak
Wayne Holakovsky
Village of Roselle
Robert Tinucci
Village of Villa Park
John Beckwith
Vydas Juskelis
City of Warrenville
Jim Burke
Phil Kuchler
Village of Wayne
Tom Read
City of West Chicago
Chris Woodill
Village of Westmont
David Lincoln
Noriel Noriega
City of Wheaton
Vince Laoang
Garrett Hummel
Village of Willowbrook
Tim Halik
Peter Krumins
Village of Winfield
Chuck Martschinke,
Peter Krumins
City of Wood Dale
John Forrest
Village of Woodridge
Bill Hoogland
Chris Bethel
Argonne National Laboratories
Joseph Kirts
Tonya Petty
Introduction 1 -4 November 2012
Natural Hazards Mitigation Plan
Planning Process: The Hazard Mitigation Workgroup followed a 10 -step process, based
on FEMA guidance and requirements. Step 1 of the planning process was to organize,
which the Hazard Mitigation Workgroup did in May and June 2006. The Workgroup has
continued to meet annually since then. In 2012, the Workgroup met on 10/26 to begin
the 5 -year plan update process. All DuPage County municipalities were also encouraged
to participate in two separate online surveys to provide opportunities for input. A final
webinar meeting was held for municipalities on 12121 to solicit input and review changes
to the updated plan.
Public Involvement: Step 2 of the planning process was to obtain input from the public,
particularly residents and businesses that have been affected by natural hazards. The
public was invited to participate through
several concurrent means, including: The Planning Process
— Contact with Workgroup members and their
organizations
— Workgroup meetings open to the public
— Press releases and mitigation information
provided to DuPage County local
newspapers and reporters
— A public meeting was held on September 26,
2007 at the DuPage County Complex to
receive comments on the draft plan
Another public meeting was held on
November 19, 2012 at the DuPage County
Complex to receive comments on the 5-
year plan update
Examples of public involvement efforts are
provided in Appendix B.
Coordination: Existing plans and programs
were reviewed during the planning process. It
should be underscored that this Plan does not
replace other county or municipal planning
efforts, such as the County's stormwater
management plan, comprehensive plans, or
local emergency management plans. This Plan
is intended to complements those efforts.
SI
Organize
Stw 2
Involve the Public
(this step mwinuei thmughwt the entire pro )
sreos
Coordinate with Agencies & Organizations
(this step mntirtuer throughout the entirepn s)
saoa
Assess the Hazard
Sim 5
Evaluate the Problem
Strn 6
Set Goals
Step 7
Review Mitigation Strategies
1
srnti s
Draft Action Plan
1
Soeo 9
Adopt the Plan
1
stw to
Implement, Evaluate, Revise
During the planning process, contacts were '
made with regional, state, and federal
agencies and organizations to determine how their programs affect or could support the
County's mitigation efforts.
C U.S. State Geological Survey (USGS)
Introduction 1 -5 November 2012
Natural Hazards Mitigation Plan
• U.S. Army Corps of Engineers (USACE)
• National Weather Service (NWS)
• Federal Emergency Management Agency (FEMA)
• Illinois Emergency Management Agency (IEMA)
• Illinois Department of Natural Resources (IDNR)
• Illinois State Water Survey
In most cases, these agencies did not provide any information or comments in response
to this effort. Direct discussions with several of them did prove helpful. These agencies
were given the opportunity to comment on the draft Plan.
The DuPage County Transportation Division, Public Works, Health Department, and GIS
department were also included in coordination efforts.
Hazard Assessment and Problem Evaluation: The Workgroup undertook steps 4 and 5 of
the planning process from June to October 2006. In addition, the hazard assessment
and problem evaluation were reviewed in February 2007. The potential hazards reviewed
were based on the natural hazards identified by the County. Each hazard was scored for
its likelihood of occurring or frequency, its potential impact or consequences, and the
vulnerability of the County to them. Five natural hazards had an overall score of "high" or
"medium ": floods, severe summer storms, severe winter storms, tornadoes, and extreme
heat.
The hazard data and the
Workgroup's findings and
conclusions are covered in Chapter
2 of this Plan. Chapter 2 examines
the hazards, including a hazard
assessment — what causes the
hazard and the likelihood of
occurrence, and a vulnerability
assessment — and the impact of
the hazard on life, health, and
property.
Goals: Mitigation planning goals were developed by the Hazard Mitigation Workgroup. A
goal- setting exercise was conducted at the September 2006 meeting. The goals were
reviewed and revised at the October 2006 meeting. The goals are presented and
discussed in Chapter 3 of this Plan. Objectives or guidelines to go with the goals were
developed as the Workgroup examined the mitigation strategies. The guidelines are
presented in Chapter 9 with the Action Plan.
During the plan update process in 2012, DuPage County representatives met to re-
evaluate and score the hazards listed in the 2007 plan. All hazards remained the same
as listed in the 2007. An additional hazard — power outage was added. Although not a
natural disaster, loss of power has been a regular side effect of natural disasters since
2007, and it was determined that steps should be taken to mitigate these effects.
Introduction 1 -6 November 2012
Natural Hazards Mitigation Plan
Mitigation Strategies: The Hazard Mitigation Workgroup considered a range of hazard
mitigation alternatives. The Workgroup examined current mitigation efforts and then
considered a variety of measures that could affect the impact of the hazards. The
mitigation strategies have been organized under six categories and all measures were
reviewed in relationship to the developed mitigation goals. The mitigation strategies are
the subject of Chapters 4 — 8 in this Plan.
— Property protection — such as, relocation out of harm's way, retrofitting buildings,
insurance.
— Preventive — such as, zoning, building codes, other development regulations,
wetlands protection, urban forestry programs.
— Structural projects — such as, levees, reservoirs, channel improvements.
— Emergency services — such as, warning, sandbagging, evacuation.
— Public information — such as, outreach projects, technical assistance to property
owners.
Action Plan: After the review of mitigation alternatives, the Workgroup drafted an "Action
Plan" that specifies recommended efforts and projects. The Action Plan describes who is
responsible for implementing the mitigation measure, when the measures are to be
done, and an estimate of cost and potential funding sources. The Action Plan was
developed with the consideration of the continuation of the Mitigation Workgroup, but
also the consideration of the countywide coordination that takes place through the
stormwater administrator's group and the LEMC. The Action Plan is included in Chapter 9
of this Natural Hazards Mitigation Plan.
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.
1.3 DuPage County
DuPage County is located 20 miles west of
Chicago in northeastern Illinois. The County Seat
is Wheaton, Illinois. DuPage County is
approximately 334 square miles. DuPage County
is bordered by Cook County to the east, Lake and
McHenry Counties to the north, Kane County to
the west, and Will County to the south.
DuPage County includes nine townships (Exhibit
1 -1) and contains portions of 39 municipalities
, 1 ,
W)
A
J
—'
STATE OF 11
(Exhibit 1 -2). A list of municipalities with general information, including the community
Introduction 1 -7 November 2012
Natural Hazards Mitigation Plan
number for FEMA's National Flood Insurance Program (NFIP) and participation in the
NFIP's Community Rating System (CRS), are shown in Table 1 -2. The NFIP and CRS
programs are discussed in Chapter 4. The College of DuPage is located in Glen Ellyn,
Illinois.
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. The
northeastern part of the County is drained by Salt Creek, which flows to the south -
southeast. The central part of the County is drained by the West and East Branches of the
Table 1 -2 — DuPage Community Information
DuPage County Community Information
community
Incorporation
Data
Home Rule
NFIP Number
CRS
community
Addison, Village of
1884
Yes
170198
Yes
Aurora, City of
1857
Yes
170320
Bartlett, Village of
1891
Yes
170059
Yes
Batavia, Village of
1891
No
170321
Bensenville, Village of
1884
No
170200
Bloomingdale, Village of
1889
Yes
170201
Bolingbrook, Village of
1965
Yes
170812
Burr Ridge, Village of
1956
No
170071
Carol Stream, Village of
1958
Yes
170202
Chicago, City of
1833
Yes
170074
Clarendon Hills, Village of
1924
No
170203
Darien, City of
1969
No
170750
Downers Grove, Village of
1873
Yes
170204
Yes
Elk Grove Village, Village of
1956
Yes
170088
Elmhurst, City of
1881
Yes
170205
Glendale Heights, Village of
1959
Yes
170206
Yes
Glen Ellyn, Village of
1892
Yes
170207
Hanover Park, Village of
1956
Yes
170099
Hinsdale, Village of
1873
No
170105
Itasca, Village of
1890
No
170210
Lemont, Village of
1873
No
170117
Lisle, Village of
1956
No
170211
Yes
Lombard, Village of
1869
No
170212
Naperville, City of
1857
Yes
170213
Yes
Oak Brook, Village of
1958
No
170214
Yes
Oakbrook Terrace, City of
1958
No
170215
Roselle, Village of
1922
No
170216
St. Charles, City of
1834
Yes
170158
Yes
Schaumburg, Village of
1914
Yes
170330
Villa Park, Village of
1915
No
170217
Warrenville, City of
1967
Yes
170218
Wayne, Village of
1958
Yes
170865
West Chicago, City of
1873
No
170219
Westmont, Village of
1922
No
170220
Wheaton, City of
1859
Yes
170221
Willowbrook, Village of
1960
No
170222
Yes
Winfield, Village of
1921
No
170223
Wood Dale, City of
1928
No
170224
Yes
Woodridge, Village of
1958
Yes
170737
Unincorporated DuPage Co.
170197
College of DuPage
n/a
n/a
Introduction 1 -8 November 2012
Exhibit 1 -1
Map of DuPage County Townships
Natural Hazards Mitigation Plan
fl 1 2 4 Miles
oPaaecwtyn cts ftwh m -142DW
Introduction 1 -9 November 2012
Natural Hazards Mitigation Plan
Exhibit 1 -2
Map of DuPage County Municipalities
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Introduction 1 -10 November 2012
Natural Hazards Mitigation Plan
DuPage River, which generally flow south. The southeast corner of the County is drained
by the Des Plaines Rivers, which flows to the southwest. The northwest and southwest
corners of the County are drained by tributaries that flow to the Fox River. Exhibit 1 -3
shows the County's major streams and watersheds.
The land surface elevation is highest in the northwestern part of the County. The land
surface gradually slopes to the southeast. Most of the County is relatively flat. The
highest natural elevation in the County is about 855 feet above sea level at Mt. Hoy. The
lowest elevation is about 585 feet above sea level in the Des Plaines River Valley at the
southeast part of the County.
DuPage County soils are predominately silt loams and silty clay loams. Portions of
DuPage County are underlain by sand and gravel. Groundwater is available from one
shallow and one deep aquifer system. The bedrock of DuPage County consists primarily
of dolomites.
Climate:
The weather statistics shown below were taken from data collected at the Wheaton
weather observation station dating back to 1895 through 2006 courtesy of the Illinois
State Water Survey,
320
100
so
e0
40
20
0
-20
a0
Temperature Trends
Jan Feb May Apr May Jun Jul Aug Sep Oct. Nov bee
The highest temperature ever recorded was 105 ° F on July 14, 1995; the lowest
temperature recorded was -26 'F on January 20, 1985. The area experiences on average
37.94 inches of precipitation annually where most of this precipitation occurs as spring
and summer thunderstorms when moisture from the Gulf of Mexico meets cooler air.
Introduction 1 -11 November 2012
Natural Hazards Mitigation Plan
Table 1 -3 DuPage County Average Monthly Precipitation Totals
The average seasonal snowfall is 36 inches. The greatest snow depth at one time
recorded between 1961 and 1990 was 29 inches on January 25, 1979. The average
relative humidity in midafternoon is about 60 percent
Some of the precipitations during the winter months were converted to liquid - equivalent
of inches from snow depth. DuPage County receives 33.5" of snowfall annually mostly
from December to February. The list below consists of the 10 biggest snowstorms as
recorded at O'Hare International Airport courtesy of the National Weather Service:
1. 23.0 inches on Jan 26 -27, 1967
2. 21.6 inches on Jan 1 -3, 1999
3. 20.2 inches on Feb 1 -2, 2011
4. 19.2 inches on Mar 25-26,1930
5. 18.8 inches on Jan 13-14,1979
6. 16.2 inches on Mar 7-8,1931
7. 15.0 inches on Dec 17-20,1929
8. 14.9 inches on Jan 6 -7, 1918
9. 14.9 inches on Jan 30, 1939
10. 14.3 inches on Mar 25-26,1970
Introduction 1 -12 November 2012
Natural Hazards Mitigation Plan
Population:
According to the 2010 U.S. Census data, DuPage County had a total population of
916,924. Approximately 88 percent of the County's population resides within the
County's 39 municipalities. The average density of people in 2010 is estimated to be
2,799 persons per square mile. The greatest density of people is in the central and
eastern portions of the County. A Municipal Population Table shows the municipal
population and size of DuPage County communities. The greatest density of people is in
the central and eastern portions of the County. Exhibit 1 -4 shows the population density
in the County by U.S. Census tract. Table 1 -3 shows the municipal population and size of
DuPage County communities. In 2000, the enrollment at the College of DuPage was
almost 29,000. Current enrollment exceeds 30,000 and is expected to grow.
In 2011, the total housing units was estimated at 355,617 units (248,762 owned and
occupied; 76,839 rental units; 10,020 vacant housing units) with an average family size
of 3.27. The density of people is approximately 2,799 people to every square mile. The
labor force is about 521,189 people.
Another important estimate for the County is the estimated travel time for people to get to
work. People commute to work location both inside and outside DuPage County. It is
estimated that 44 percent of the DuPage population travels 30 minutes or more to work.
Introduction 1 -13 November 2012
Natural Hazards Mitigation Plan
Like many suburban areas around the United States, DuPage County is experiencing a
significant population change. Although the County will continue to experience modest
population growth, the new residents are increasingly likely to be members of minority
groups, particularly Latinos, or international immigrants. Further, many more low income
persons are and will be living in DuPage County.
Population growth is the basic indicator. While surrounding counties are experiencing
suburban sprawl and farmlands are being rezoned into residential developments, DuPage
County has mostly exhausted all of its farmland with developments. The future of the
County as its population exceeds one - million people will see DuPage not just as a suburb
of Chicago, but as a growing economic power in the region that draws top technological
employers. As urbanization occurs, emergency management must evolve to support the
larger population and the new challenges that come with a larger population density.
DuPage County continues to be the second most populated county in Illinois. In 2007,
DuPage County had an estimated population of 929,192. This is a 2.2% increase in five
years, where the population was 909,476 in 2002.
Table 1 -4 DuPage County Population
Introduction 1 -14 November 2012
Natural Hazards Mitigation Plan
Exhibit 1.3
Map of DuPage County Watersheds
Sawl'a Creek r \. FNw NN
West &anr h DuPape.Rer N 46'+
Ea taran h mpagomm 0 1 2 4Wes S
Des Plaines Tr ks DtFa9*C&J*1TMISDgwkT+d-A4MM
Introduction 1 -15 November 2012
Natural Hazards Mitigation Plan
Exhibit 1.4
DuPage County Population Density by U.S Census Tract (2000)
Source: U.S. Census Bureau
Data Classes
eels ISG wile
347 - 1763
M28 - 302S
3129 - 4107
4573 - S713
5797.- 7156
Features
/✓ Na1ar Read
`J StremNaterbody
!Y Stream/Watefbody
Items fngra•rtezt
are not visible
at this zoom level
Introduction 1 -16 November 2012
Natural Hazards Mitigation Plan
Table 1 -5 DuPage County Population and Land Area Information
Population, 2010 Census
Area in square miles
Community
Total
Population
DuPage
Cook
Kane
Kendall
Will
Total
area
DuPage
Area In
Other
Counties
Addison, Village of
37,198
37,198
9.98
9.98
0
Aurora, City of
197,899
49,433
142,990
840'
2,955`
45.80
19.65
26.15
Bartlett, Village of
41,208
24,411
12,196
2
15.86
10.85
5.01
Batavia, Village of
25,983
2,117`
23,866
9.70
0.53
9.17
Bensenville, Village of
18,352
18,352
5.62
5.41
0.21
Bloomingdale, Village of
22,047
22,018
7.04
7.04
0
Bolingbrook, Village of
73,366
1,571
54,573`
24.26
3.88
20.38
Bun Ridge, Village of
10,559
6,719
3,623`
7.14
4.69
2.45
Carol Stream, Village of
39,740
39,740
9.42
9.42
0
Chicago, City of
2,707,123
2,703,466`
2,896,014`
234.11
2.41
231.7
Clarendon Hills, Village of
8,427
8,427
1.81
1.81
0
Darien, City of
22,086
22,086
1
6.30
6.30
0
Downers Grove, Village of
47,833
47,833
14.45
14.45
0
Elk Grove Village, Village of
33,127
0
11.41
1.02
10.39
Elmhurst, City of
44,121
44,121
10.31
10.28
0.03
Glendale Heights, Village of
34,208
34,208
5.51
5.51
0
Glen Ellyn, Village of
27,450
27,450
6.77
6.77
0
Hanover Park, Village of
37,973
17,337
20,755`
1 6.43
138
3.05
Hinsdale, Village of
16,816
14,589
2,140`
4.64
3.71
0.93
Itasca, Village of
8,649
8,649
5.07
5.07
0
Lemont, Village of
16,000
10
13,092`
8.35
2.46
5.89
Lisle, Village of
22,390
22,390
7.02
7.02
0
Lombard, Village of
43,165
43,165
10.45
10.45
0
Naperville, City of
141,853
94,533
37,374`
39.32
29.01
1031
Oak Brook, Village of
7,883
7,876
8.28
8.27
0.01
Oakbrook Terrace, City of
2,134
2,134
1.27
1.27
0
Roselle, Village of
22,763
19,040
3,460`
5.48
4.81
0.67
St. Charles, City of
32,974
543
27,896`
14.93
1.17
13.76
Schaumburg, Village of
74,198
73,333`
75,386`
1
1 19.33
0.33
1 19
Villa Park, Village of
21,904
21,904
4.75
4.75
0
Warrenville, City of
13,140
13,140
5.62
5.62
0
Wayne, Village of
2,431
1,570
834`
5.87
3.16
2.71
West Chicago, City of
27,086
27,086
15.14
15.14
0
Westmont, Village of
24,685
24,685
5.14
5.14
0
Wheaton, City of
52,894
52,894
11.44
11.44
0
Willowbrook, Village of
8,540
8,540
2.75
2.75
0
Winfield, Village of
9,080
9,080
3.03
3.03
0
Wood Dale, City of
13,770
13,770
4.84
1 4.84
0
Woodridge, Village of
32,971
32,949
9.58
8.94
0.64
Unincorporated DuPage Co.
97,758
97.35
97.35
0
Totals:
923,222
334
Introduction 1 -17 November 2012
Before the 1970s, DuPage
County was primarily a group
of bedroom communities with
residents who worked in
Chicago. Substantial
investments were made into
transportation and utility
infrastructure, and along with
other public improvements,
DuPage County has become a
major employment center in
the Chicago region. Beginning
in the 1980s, DuPage County
is one of the fastest growing
counties in the nation.
Natural Hazards Mitigation Plan
Table 1 -6 Land Use and Development
Table 1 -7
DuPage County Land
Uses
Land Use
Percent of
County
Rural and Undeveloped Land:
Agricultural/Vacant
5.8
Open Space /water /recreation
19.6
Total Undeveloped
25.41/6
Urban and Built -Up Land:
Single Family Residential
32.0
Multifamily Residential
4.6
Commercial
3.9
Office/Industrial/Business
8.3
Laboratory
3.3
Institutional
3.6
Transportation/Communications/Utilities
19.0
Total Developed
74.6%
Source: DuPage County Land Use 2003
Transportation facilities in the county
include three interstates and toll roads,
nine other State and U.S highways, three
major rail lines for commuters and
freight, and one air traffic facility.
Table 1 -5 provides estimated land uses
in DuPage County. Almost three - quarters
(74.6 percent) of DuPage County is
developed. Hazard mitigation is primarily
concerned with developed areas of
communities - where the people are,
where the buildings that they live and
work in are. Also of concern is the
infrastructure that serves the community.
The "developed" land use category
includes residential and commercial
development, such as homes,
businesses, and industrial uses. The
largest category of development in
DuPage County is single - family homes (32 percent). The institutional category includes
public facilities, schools, churches, hospitals, and offices of federal, state, and regional
agencies.
The "undeveloped" land use category includes agricultural land, which is not really
"undeveloped." Agricultural land includes things such as farmhouses, nurseries,
Introduction 1 -18 November 2012
agricultural businesses, and improved
farmland. However, there is not a
concentration of buildings and
infrastructure exposed to damage by
natural hazards, so it is treated as
undeveloped for this Plan's purposes.
Also, open space includes the nearly
23,000 acres of land owned by the
DuPage County Forest Preserve District.
In keeping with population growth,
development has continued to grow in
DuPage County. Population growth
through 2001 is estimated at 3 percent
The County development growth rate is
estimated to be 5.6 percent, with much
of the future development anticipated in
the western portion of DuPage County.
1.5 Critical Facilities
Natural Hazards Mitigation Plan
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Critical facilities are buildings and infrastructure whose exposure or damage can affect
the well -being of a large group. For example, the impact of a flood or tornado on a
hospital is greater than on a home or most businesses.
Generally, critical facilities fall into two categories:
— Buildings or locations vital to public safety and the disaster response and recovery
effort, such as police and fire stations and telephone exchanges, and
— Buildings or locations that, if damaged, would create secondary disasters.
Examples of such buildings or locations are hazardous materials facilities and
nursing homes.
Critical facilities in the County and each municipality are included in the Critical
Infrastructure Location Manager (CILM), a web -based program that interfaces with the
County's GIS. Emergency event parameters can be input into the CILM and a regional
database of all critical facilities it provided. Large scale maps and detailed information is
readily available to the County and municipal staff, at any time.
Critical facilities were identified by each community participating in this Plan. For this
mitigation planning effort, the follow seven categories are included in the definition of
critical facilities:
1. Hazardous materials sites: These have been broken into two categories based on
USEPA classifications: those with "extremely hazardous substances" (EHS) and
those without. These definitions are in 40 CFR Part 355, Appendices A and B, which
also defines their "threshold planning quantities," i.e., how much of the substance
Introduction 1 -19 November 2012
Natural Hazards Mitigation Plan
qualifies as being a concern. EHS includes well over 100 substances, from acetone
to zinc phosphide.
2. Health facilities: hospitals and nursing homes.
3. Emergency response facilities: police and fire stations, public works sites,
emergency operations centers (EOCs), etc.
4. Utilities: water and wastewater treatment plants, electrical substations, etc.
5. Schools.
6. Places of assembly, such as theaters and churches.
7. Bridges that would be inundated during the base or 100 -year flood. These are
discussed more in Chapter 2.
Most categories of critical facilities listed above are included in the DuPage County's GIS
for emergency management and other planning purposes. Critical facilities included in
the broader definition of this Plan are either in other GIS layers (e.g., school) or will be
added to the County's database. Due to confidentiality, and due to the large number of
critical facilities throughout DuPage County, maps and lists of critical facilities are not
printed in this Plan. Maps and information on critical facilities are readily available to the
County and communities through the County's GIS and the CILM system.
The College of DuPage in Glen Ellyn has nine buildings at the Main Campus and seven
buildings at regional sites. Including maintenance facilities and additions, the College
maintains 23 building. Construction dates range from 1969 to 2004.
Chapter 2 discusses critical facilities that are impacted by the various types of natural
hazard. Hazard mitigation measures for critical facilities are identified in Chapters 4
through 8.
1.6 References
1. Critical facilities data supplied by municipalities and County offices.
2. DuPage County Economic Profile, DuPage County Department of Economic
Development and Planning, 2006.
3. DuPage County 2003 Land Use Analysis and Trends, DuPage County Department
of Economic Development and Planning, 2004.
4. Example Plans, FEMA /Community Rating System, 2002.
5. Getting Started — Building Support for Mitigation Planning, FEMA, FEMA- 386 -1,
2002.
6. State and Local Plan Interim Criteria Under the Disaster Mitigation Act of 2000,
FEMA, 2002.
7. Survey of County offices and municipalities, July- November 2006,
8. U.S. Census Bureau website.
9. Illinois Emergency Management Agency,
10. DuPage County Flood Insurance Study, FEMA, 2004.
Introduction 1 -20 November 2012
Natural Hazards Mitigation Plan
11. Soil Survey of DuPage County, Illinois, USDA, National Resource Conservation
Service, 1999.
12. DuPage County Information Technology Department.
13. Student Portrait, Fall Semester 2005, Meher Choksey and Jan Hunsicker, College
of DuPage
14. Institutional Portrait, 2005 -2006, Terry Perrino, College of DuPage.
Introduction 1 -21 November 2012