FLOOD INSURANCE STUDY

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1 FLOOD INSURANCE STUDY A Report of Flood Hazards in DUPAGE COUNTY, ILLINOIS DuPage County Community Name Community Number River Basin Community Name Community Number River Basin Addison, Village of 7098 Lemont, Village of 707 Aurora, City of Lisle, Village of 702 Bartlett, Village of Lombard, Village of 7022 Bensenville, Village of Naperville, City of 7023 Bloomingdale, Village of 7020 Oak Brook, Village of 7024 Carol Stream, Village of Oakbrook Terrace, City of 7025 Clarendon Hills, Village of Roselle, Village of 7026 Darien, City of Villa Park, Village of 7027 Downers Grove, Village of Warrenville, City of 7028 DuPage County (Unincorporated Areas) 7097 Elmhurst, City of Glen Ellyn, Village of Glendale Heights, Village of Hinsdale, Village of 7005 Itasca, Village of 7020 Wayne, Village of West Chicago, City of 7029 Westmont, Village of Wheaton, City of 7022 Willowbrook, Village of Winfield, Village of Wood Dale, City of Woodbridge, Village of Federal Emergency Management Agency State of Illinois Flood Insurance Study Number 7043CV000H

2 FOREwORD This countywide Flood Insurance Study (FIS) Report was produced through a unique cooperative partnership between the DuPage County and the Federal Emergency Management Agency (FEMA). DuPage County has implemented a long-term approach to floodplain management to decrease the costs associated with flooding. As a part of this effort, DuPage County has joined with FEMA in a Cooperating Technical Partner (CTP) agreement to produce and maintain this FIS Report and the accompanying digital Flood Insurance Rate Map (FIRM) for DuPage County.

3 NOTICE TO FLOOD INSURANCE STUDY USERS Communities participating in the National Flood Insurance Program have established repositories of flood hazard data for floodplain management and flood insurance purposes. This Flood Insurance Study (FIS) may not contain all data available within the repository. It is advisable to contact the community repository for any additional data. Part or all of this FIS may be revised and republished at any time. In addition, part of this FIS may be revised by the Letter of Map Revision process, which does not involve republication or redistribution of the FIS. It is, therefore, the responsibility of the user to consult with community officials and to check the community repository to obtain the most current FIS components. Initial Countywide FIS Effective Date: Revised Countywide FIS Date:

4 TABLE OF CONTENTS Page.0 INTRODUCTION. Purpose of Study.2 Authority and Acknowledgments.3 Coordination AREA STUDIED 7 2. Scope of Study Community Description Principal Flood Problems Flood Protection Measures ENGINEERING METHODS Hydrologic Analyses Hydraulic Analyses Vertical Datum FLOODPLAIN MANAGEMENT APPLICATIONS Floodplain Boundaries Floodways INSURANCE APPLICATIONS FLOOD INSURANCE RATE MAP OTHER STUDIES LOCATION OF DATA BIBLIOGRAPHY AND REFERENCES 86 ii

5 TABLE OF CONTENTS - continued Page FIGURES Figure - Floodway Schematic 63 TABLES Table - Initial and Final CCO Meetings 6-7 Table 2 - Flooding Sources Studied by Detailed Methods 7-8 Table 3 - Summary of Discharges 2-27 Table 4 Manning s n Values Table 5 - Floodway Data Table 6 00-Year Flood Data Table No reference made in text for this table! Table 7 - Community Map History EXHIBITS Exhibit - Flood Profiles Addison Creek (DPAC) Panel 0P Addison Creek Tributary No. (DPAC) Panel 02P Addison Creek Tributary No. 2 (DPAC) Panel 03P Addison Creek Tributary No. 3 (DPAC) Panels 04P-05P Armitage Ditch (EBAR) Panels 30P-3P Armitage Fork (EBAR) Panel 32P Bensenville Ditch (DPBP) Panels 06P-07P Brewster Creek (FRBC) Panels 85P-86P Briarwood Ditch (SCGC) Panel 98P Bronswood Cemetary Tributary (SCBW) Panels 9P-93P Crabtree Creek (EBCR) Panels 33P-35P Cress Creek (WBCC) Panel 50P Des Plaines River (DPDP) Panels 08P-09P Devon Avenue Tributary (SCDA) Panel 94P East Branch Du Page River (EBEB) Panels 36P-43P East Branch Sawmill Creek (SWSW) Panels 44P-45P East Branch Tributary No. (EBE) Panels 44P-45P East Branch Tributary No. 2 (EBE2) Panel 46P East Branch Tributary No. 3 (EBEB) Panels 47P-48P East Branch Tributary No. 4 (EBGL) Panels 49P-50P East Branch Tributary No. 5 (EBWI) Panels 5P-53P St. Procopius Creek (EBE6) Panels 54P-55P iii

6 TABLE OF CONTENTS - continued EXHIBITS continued Exhibit - Flood Profiles (continued) East Branch Tributary No. 7 (EBE7) Panels 56P-57P Ferry Creek (WBFE) Panels 5P-54P Ferry Creek Tributary No. (WBFE) Panels 55P-57P Flagg Creek (DPFC) Panel 2P Ginger Creek (SCGC) Panels 95P-97P Heritage Oaks Tributary (SCGC) Panel 99P Klein Creek Tributary No. (WBKC) Panels 67P-68P Klein Creek Tributary No. 2 (WBKC) Panel 69P Klein Creek Tributary No. 3 (WBKC) Panel 70P Klein Creek (WBKC) Panels 6P-66P Kress Creek (WBKR) Panels 7P-77P Lacey Creek (EBLA) Panels 58P-60P Lombard Tributary (SCGC) Panel 00P Mays Lake Tributary (SCGC) Panels 0P-02P Meacham Creek (SCSB) Panels 4P-5P Midwest Club Tributary (SCGC) Panel 03P North Branch St. Joseph Creek (EBSJ) Panel 80P Norton Creek (FRNC) Panel 87P Norton Creek Tributary (FRNC) Panel 88P North Unnamed Creek (DPWL) Panel 24P Plainfield Road Ditch (DPFC) Panels 7P-8P Prentiss Creek (EBPR) Panels 6P-64P Rott Creek (EBRC) Panels 65P-68P Salt Creek (SCSC) Panels 6P-30P Sawmill Creek (SWSW) Panels 36P-40P Sawmill Creek Tributary No. (SWSW) Panels 48P-49P Sawmill Creek Tributary No. 3 (DPDP) Panels 0P-5P South Branch St. Joseph Creek (EBSJ) Panels 8P-82P South Fork Westwood Creek (SCWC) Panel 35P South Unnamed Creek (DPWL) Panel 23P Spring Brook Creek (SCSB) Panels 06P-2P Spring Brook No. (WBSP) Panels 80P-84P Spring Brook No. 2 (DUSG) Panels 25P-29P Spring Road Tributary (SCOB) Panels 04P-05P St. Joseph Creek (EBSJ) Panels 69P-75P St. Joseph Creek Tributary (EBSJ) Panel 83P Sugar Creek (SCSU) Panels 3P-32P Sugar Creek Tributary A (SCSU) Panel 33P Tributary (A) (EBSJ) Panels 76P-78P Tributary 2(B) (EBSJ) Panel 79P Unnamed Creek (South of Foxcroft Road) (WBFX) Panels 58P-59P Unnamed Stream (North of 22 nd Street) (EBTS) Panel 84P Unnamed Creek (South of 87 th Street) (WBFX) Panel 60P Unnamed Tributary to Kress Creek (WBKR) Panels 78P-79P Wards Creek (SWSW) Panels 46P-47P Waubansee Creek (FRWA) Panels 89P-90P iv

7 TABLE OF CONTENTS - continued EXHIBITS continued Exhibit - Flood Profiles (continued) West Branch DuPage River (WBWB) Panels 85P-96P West Branch Sawmill Creek (SWSW) Panels 4P-43P West Branch Tributary No. (WBW) Panels 97P-98P West Branch Tributary No. 2 (Country Creek) (WBW2) Panels 99P-200P West Branch Tributary No. 3 (WBW3) Panels 20P-202P West Branch Tributary No. 4 (WBW4) Panels 203P-204P West Branch Tributary No. 5 (WBW5) Panel 205P West Branch Tributary No. 6 (WBW6) Panels 206P-208P West Branch Tributary No. 7 (WBW7) Panels 209P-2P West Branch Tributary to Spring Brook Creek (SCSB) Panel 3P Westwood Creek (SCWC) Panel 34P Winfield Creek (WBWF) Panels 22P-27P Winding Creek (WBWG) Panels 28P-29P 59 th Street Ditch (DPFC) Panel 22P 63 rd Street Ditch (DPFC) Panels 9P-20P 79 th Street Ditch (DPFC) Panel 6P Exhibit 2 - Flood Insurance Rate Map Index Flood Insurance Rate Map v

8 FLOOD INSURANCE STUDY LINOIS.0 INTRODUCTION. Purpose of Study This countywide Flood Insurance Study (FIS) investigates the existence and severity of flood hazards in, or revises and updates previous FISs/Flood Insurance Rate Maps (FIRMs) for the geographic area of DuPage County, Illinois, including: the Villages of Addison, Bartlett, Bensenville, Bloomingdale, Carol Stream, Clarendon Hills, Downer s Grove, Glen Ellyn, Hinsdale, Itasca, Lisle, Lombard, Oakbrook, Villa Park, Wayne, Westmont, Willowbrook, Winfield, and Woodridge; the Cities of Aurora, Darien, Elmhurst, Oakbrook, and West Chicago, and the unincorporated areas of DuPage County (hereinafter referred to collectively as DuPage County). The FIS and FIRMs for DuPage County will also show the portion of the Villages of Burr Ridge, Elk Grove, Hanover Park, Schaumburg, and Wayne; the Cities of Chicago and St. Charles that lie within DuPage County. The remaining portions of these communities lie within other counties; these communities have, therefore, been shown on DuPage County FIRMs for informational purposes only. The information contained on the DuPage County FIS for these communities is not to be used for flood insurance purposes. This FIS aids in the administration of the National Flood Insurance Act of 968 and the Flood Disaster Protection Act of 973. This FIS has developed flood risk data for various areas of the county that will be used to establish actuarial flood insurance rates. This information will also be used by DuPage County to update existing floodplain regulations as part of the Regular Phase of the National Flood Insurance Program (NFIP), and will also be used by local and regional planners to further promote sound land use and floodplain development. Minimum floodplain management requirements for participation in the NFIP are set forth in the Code of Federal Regulations at 44 CFR, In some States or communities, floodplain management criteria or regulations may exist that are more restrictive or comprehensive than the minimum Federal requirements. In such cases, the more restrictive criteria take precedence and the State (or other jurisdictional agency) will be able to explain them..2 Authority and Acknowledgments The sources of authority for this FIS are the National Flood Insurance Act of 968 and the Flood Disaster Protection Act of 973. This FIS was prepared to include the unincorporated areas of, and incorporated communities within, DuPage County in a countywide format. Information on the authority and acknowledgments for each jurisdiction included in this countywide FIS, as compiled from their previously printed FIS reports, is shown below.

9 Addison, Village of: Aurora, City of: Bloomingdale, Village of: Burr Ridge, Village of: the hydrologic and hydraulic analyses for this study were performed by Harza Engineering Company of Chicago, Illinois, for the FIA, under Contract No. H That work was completed in September 976. the hydrologic and hydraulic analyses for the original December 978, study wasperformed by Harza Engineering Company for the FIA under Contract No. H That work was completed in October 976. the hydrologic and hydraulic analyses for this study were performed by the Illinois State Water Survey for the FIA under Contract No. H Analysis of the East Branch DuPage River was coordinated with the USACE, Chicago District. That study was completed in September 979. the hydrologic and hydraulic analyses for this study were performed by Harza Engineering Company for the FIA under Contract No. H That study was completed in August 978. For the May 5, 986, revision, the hydraulic analyses were obtained from the Illinois Department of Transportation (IDOT). For the January 5, 989, study, the hydrologic and hydraulic analyses were taken from the FISs for the City of Aurora and the unincorporated areas of Kane and DuPage Counties, and from a Soil Conservation Service (SCS) floodplain management study for Indian Creek and Tributaries. For this revision, the hydrologic and hydraulic analyses were prepared by the SCS and the Illinois Department of Transportation, Division of Water Resources (IDOT/DWR). That work was completed in June

10 Carol Stream, Village of: Clarendon Hill, Village of: Darien, City of: Downer s Grove, Village of: Elmhurst, City of: the hydrologic and hydraulic analyses for this study were performed by the USACE, Chicago District, for the FIA, under Inter- Agency Agreement No. IAA-H-6-75, Project Order No. 9 and Inter-Agency Agreement No. IAA-H-7-76, Project Order No.. That study was completed in April 977, and was partially revised in January 98. the hydrologic and hydraulic analyses for this study were performed by Harza Engineering Company for the FIA, under Contract No. H That study was completed in January 979. the hydrologic and hydraulic analyses for this study were performed by Harza Engineering Company for the FIA, under Contract No. H That work was completed in April 978. the hydrologic and hydraulic analyses in this study represent a revision of the original analyses by the USACE, Chicago District, for FEMA, under Inter-Agency Agreement No. IAA-H-6-75, Project Order No. 9 and Inter-Agency Agreement No. IAA-H-7-76, Project Order No.. The updated version was prepared by Dewberry & Davis under agreement with FEMA. the hydrologic and hydraulic analyses for the original August 4, 980, study, were prepared by the Illinois State Water Survey (ISWS) for the FIA under Contract No. H That work was completed in September 978. For this revision, the hydrologic and hydraulic analyses were prepared by Harza Engineering Company. That work was completed in April 994. Glen Ellyn, Village of: the hydrologic and hydraulic analyses for this study were performed by the Chicago District of the USACE for the FIA, under Inter-Agency Agreement No. IAA-H-7-76, 3

11 Project Order No. 9. That work was completed in June 977. Hanover Park, Village of: Itasca, Village of: Lisle, Village of: Lombard, Village of: Naperville, City of: Oakbrook, Village of: Oakbrook Terrace, City of: the hydrologic and hydraulic analyses for this study were performed by the USACE, Chicago District, for the FIA, under Inter- Agency Agreement No. IAA-H-7-76, Project Order No. 9. That work was completed in September 977. the hydrologic and hydraulic analyses for this study were performed by the SCS for the FIA, under Inter-Agency Agreement No. IAA-H-7-75, Project Order No. 4. That work was completed in November 976. the hydrologic and hydraulic analyses for this study were performed by the USACE, Chicago District, for the FIA, under Inter- Agency Agreement Nos. IAA-H-6-75, Project Order No. 2; IAA-H-7-76, Project Order No. ; and IAA-H-7-76, Amendment No. 3 to Project Order No.. That work was completed in September 977. the hydrologic and hydraulic analyses for this study were performed by the Chicago District of the USACE for the FIA, under Inter-Agency Agreement No. IAA-H-7-76, Project Order No. 9. That work was completed in June 977. the hydrologic and hydraulic analyses for this study were prepared by the Chicago District of the USACE for the FIA under Inter-Agency Agreement Nos. IAA-H-6-75, Project Order No. 2 and IAA-H-7-76, Project Order No.. That work was completed in February 978. the hydrologic and hydraulic analyses for this study were performed by the Illinois State Water Survey for the FIA, under Contract No. H That study was completed in September 978. the hydrologic and hydraulic analyses for this study were performed by the Illinois State Water Study for the Federal Insurance 4

12 Administration, under Contract No. H This study was completed in September 978. Schaumburg, Village of: St. Charles, City of: Villa Park, Village of: Wayne, Village of: West Chicago, City of: Westmont, Village of: Wheaton, City of: the hydrologic and hydraulic analyses for this study were performed by Harza Engineering Company for the FIA, under Contract No That work was completed in October 977. the hydrologic and hydraulic analyses for this study were performed by the USACE, Chicago District, for the FIA, under Inter- Agency Agreement No. IAA-H-8-78, Project Order No. 3. That study was completed in March 980. the hydrologic and hydraulic analyses for this study were performed by the Illinois State Water Survey for the FIA, under Contract No. H That study was completed in September 978. the hydrologic and hydraulic analyses for this study were performed by the USACE, Chicago District, for the FIA, under Inter-Agency Agreement No. IAA-H-8-78, Project Order No. 3. That study was completed in February 980. the hydrologic and hydraulic analyses for his study were performed by the USACE, Chicago District, USACE, for the FIA, under Inter-Agency Agreement No. IAA-H- 7-76, Project Order No. 9, and Amendment No. 2 to this same agreement. That work was completed in April 977. the hydrologic and hydraulic analyses for this study were performed by Harza Engineering Company for the FIA, under Contract No. H That study was completed in May 979. the hydrologic and hydraulic analyses for this study were done by the USACE, Chicago District, for the FIA, under Inter- Agency Agreement No. IAA-H-7-76, 5

13 Project Order No. 9, with amendment. That work was completed in June 977. Willowbrook, Village of: Wooddale, City of: Woodridge, Village of: the source of authority for this FIS is the National Flood Insurance Act of 968, as amended. the hydrologic and hydraulic analyses for this study were performed by the U.S. Department of Agriculture, SCS, for the FIA under Inter-Agency Agreement No. IAA-H- 8-75, Project Order No. 6. That work was completed in August 976. the source of authority for this FIS is the National Flood Insurance Act of 968, as amended..3 Coordination An initial Consultation Coordination Officer s (CCO) meeting is held with representatives of the communities, FEMA, and the study contractors to explain the nature and purpose of the FIS, and to identify the streams to be studied by detailed methods. A final CCO meeting is held typically with representatives of the communities, FEMA, and the study contractor to review the results of the FIS. The dates of the initial and final CCO meetings held for DuPage County and the incorporated communities within its boundaries are shown in Table, "Initial and Final CCO Meetings." TABLE - INITIAL AND FINAL CCO MEETINGS Community Initial CCO Date Final CCO Date Village of Addison * November 0, 976 City of Aurora November 8, 993 April 24, 996 Village of Bartlett January 976 September 5, 980 Village of Bensenville October 4, 984 October 3, 988 Village of Bloomingdale July 9, 977 May 28, 980 Village of Burr Ridge March 976 May 4, 979 Village of Carol Stream January 975 January 9, 98 Village of Clarendon Hills July 977 August 6, 979 City of Darien * January 29, 979 Village of Downer s Grove January 975 June 30, 977 City of Elmhurst August 4, 980 January 8, 980 Village of Glen Ellyn December 975 * *Data not available 6

14 TABLE - INITIAL AND FINAL CCO MEETINGS - continued Community Initial CCO Date Final CCO Date Village of Hanover Park January 976 June, 977 Village of Hinsdale July 977 December 3, 979 Village of Itasca January 975 October 26, 976 Village of Lisle December 974 June 2, 977 Village of Lombard December 975 September 2, 977 City of St. Charles December 977 October 4, 980 Village of Schaumburg February 3, 975 November 7, 977 Village of Oak Brook August 976 January 0, 980 City of Oakbrook Terrace March 30, 977 January 30, 980 Village of Villa Park August 976 January 2, 980 Village of Wayne * January 6, 98 Village of Westmont July 977 October 29, 979 City of West Chicago January 2, 976 September 5, 977 Village of Willowbrook * January 0, 979 Village of Winfield January 5, 976 June 2, 977 Village of Woodridge * July 22, 976 *Data not available 2.0 AREA STUDIED 2. Scope of Study This FIS covers the geographic area of DuPage County, Illinois. Table 2, Flooding Sources Studied by Detailed Methods, lists the flooding sources that have been studied by detailed methods. Limits of detailed study are indicated on the Flood Profiles (Exhibit ) and/or on the FIRM (Exhibit 2). TABLE - FLOODING SOURCES STUDIED BY DETAILED METHODS 59 th Street Ditch 63 rd Street Ditch 79 th Street Ditch Addison Creek Addison Creek Tributary No. Addison Creek Tributary No. 2 Addison Creek Tributary No. 3 Armitage Creek Armitage Fork Brewster Creek Briarwood Ditch Bronswood Cemetery Tributary Crabtree Creek Cress Creek Des Plaines River Devon Avenue Tributary East Branch DuPage River East Branch Lacey Creek East Branch Sawmill Creek East Branch Tributary No. 3 East Branch Tributary No. 4 Ferry Creek Ferry Creek Tributary No. Flagg Creek Ginger Creek Heritage Oaks Tributary Klein Creek Kress Creek Lacey Creek Lombard Tributary 7

15 TABLE - FLOODING SOURCES STUDIED BY DETAILED METHODS continued Meacham Creek Midwest Club Tributary North Branch St. Joseph Creek North Unnamed Creek Norton Creek Norton Creek Tributary Plainfield Road Ditch Prentiss Creek Salt Creek Sawmill Creek South Branch St. Joseph Creek South Fork of Westwood Creek South Unnamed Creek Spring Brook Creek Spring Brook No. Spring Brook No. 2 Spring Road Tributary St. Joseph Creek St. Joseph Creek Tributary St. Procopius Creek Sugar Creek Sugar Creek Tributary A Tributary (A) Tributary B Unnamed Creek South of Foxcroft Road Unnamed Stream North of 22 nd Street Unnamed Tributary to Kress Creek Waubansee Creek West Branch DuPage River West Branch Sawmill Creek West Branch Tributary No. West Branch Tributary No. 2 West Branch Tributary No. 3 West Branch Tributary No. 4 West Branch Tributary No. 6 West Branch Tributary to Spring Brook Creek Westwood Creek Winding Creek Winfield Creek According to the State Water Survey, East Branch Tributary No. 4 is also known as Glen Crest Tributary. For this revision, 6,300 feet of the main channel of East Branch Tributary No. 2 was studied by detailed methods starting from a detention pond on the north side of James Court serving a subdivision in Glendale Heights north of North Avenue extending up to a point just upstream of Main Street. The areas studied by detailed methods were selected with priority given to all known flood hazard areas, and areas of projected development or proposed construction. Approximate methods of analysis were used to study those areas having a low development potential or minimal flood hazards. The scope and methods of study were proposed to and agreed upon by FEMA and the unincorporated areas of DuPage County. 2.2 Community Description DuPage County is situated in northeastern Illinois, approximately 25 miles directly west of the City of Chicago. DuPage County is bordered by Cook County on the north and east, Will County on the south, and Kane County on the 8

16 west. The county encompasses 332. square miles and had a 2000 residential population of 904,6 according to the 2000 U.S. Census. The gross residential density of 2000 was 2,722 people per square mile. Approximately 200 square miles or 60 percent of the county is in unincorporated areas. Temperature data is published for two climatological stations in DuPage County, Wheaton, and Argonne National Laboratories. The average annual temperature of Wheaton which is typical for these stations, and for the county as well, is 49.8 degrees Fahrenheit ( F) with an annual monthly high in July of 76.5 F and monthly low in January of 9.2 F. The annual average precipitation at Wheaton is inches. The highest monthly average precipitation occurs in August with a value of 7.65 inches (U.S. Department of Commerce, 975). There are four major drainage basins in DuPage County. These are: the West Branch DuPage River, the East Branch DuPage River, Salt Creek, and the Des Plaines River. The West Branch DuPage River, the East Branch DuPage River, and Salt Creek all run from north to south and divide the county into four vertical strips. The Des Plaines River flows along the southeastern boundary of DuPage County. The West Branch DuPage River flows southward near the western edge of the county. This river flows through the communities of Bartlett, Winfield, West Chicago, Warrenville, and Naperville. The East Branch DuPage River flows southward in the central portion of the county. Communities that are adjacent to this river are Glendale Heights, Lombard, Glen Ellyn, Downers Grove, and Lisle. The major tributaries studied in this drainage basin are Prentiss Creek, St. Joseph Creek, and Lacey Creek. Salt Creek is a tributary of the Des Plaines River. It flows southward from the northern section of Cook County to Oak Brook, then eastward to its confluence with the Des Plaines River, at Lyons. The Des Plaines River, located in the southeastern section of the county, flows southwest to its confluence with the Illinois River at Joliet. Sawmill Creek, Illinois and Michigan Canal, Chicago Sanitary and Ship Canal, and some minor tributaries were studied in the Des Plaines River basin. There is a minimal amount of development within the floodplains of DuPage County. This is because all development within the floodplains is regulated by the DuPage County Zoning Ordinance of 935 (DuPage County Zoning Ordinance, 935). 2.3 Principal Flood Problems In the unincorporated areas of DuPage County, flood peaks have been increasing because of recent urbanization of the uplands with resultant greater runoff. 9

17 Urbanization is often accompanied by filling of the floodplain or by encroachment upon it, which reduces channel conveyance capacity. Increased floods on the main channels cause backwater effects up their tributaries. Additional flood runoff is unable to flow through restricted culverts and bridge openings, which often are clogged with sediment and debris from new construction. The problems associated with urbanization are further complicated by inadequate channel improvements. Flood damages include residential, some business and commercial damage, road closures with corresponding transportation disruption, school closures, and agricultural, with residential absorbing the greatest damage. The floodwater enters sanitary sewers through street manholes, and floods basements and lower levels causing major cleanup problems and health hazards. More severe floods gain direct entrance to basements, subground living areas, and lower-level garages through surface runoff. This type of flood causes some minor structural damage. Very rarely do floods enter first-floor levels by direct surface runoff; however, when this does occur, there is usually major damage to structures and contents. Another major type of flood damage is the flooding of highways and local roads which results in considerable costs incurred by delays in travel. These flooded roads impede emergency vehicles and vehicles providing necessary goods and services, and will often close schools because of lack of access. Another type of flood damage is neighborhood degradation caused by frequent flooding. This type of damage usually results in declining property values within the flooded area. The impact of this type of damage is difficult to determine due to the many factors which influence the way property values change over time. Estimates for flood damages are not available for the unincorporated areas of DuPage County. Floods have occurred in the study reaches of the DuPage River Basin and its tributaries during all seasons of the year. The greatest recorded flood occurred in August 972. Flooding has usually resulted from heavy thunderstorms following a period of prolonged rainfall that had saturated the ground. The major storm of August 972 was preceded by a heavy rainfall for two days. During the winter months, flooding has usually been a result of heavy rainfall on frozen ground. Snowmelt can also be a factor in late winter or early spring. Because of the high runoff associated with saturated or frozen ground, stream flow stages in this area can be expected to rise quickly from normal to flood levels. 0

18 Principal Flood Problems for the Des Plaines River Watershed Watershed s major tributaries Flagg Creek The past history of flooding on Flagg Creek within the Village of Clarendon Hills indicates that flooding may occur during any season of the year. The majority of floods have occurred during March, April, and May; they are usually the result of spring rains and/or snowmelt. The 00-year discharge varies from 380 cfs at the downstream corporate limit to 90 cfs at the Eastern Avenue bridge. No high water marks are known to exist on Flagg Creek within the study area. Damaging floods on Flagg Creek can be documented from discharge records for the USGS gage on Flagg Creek at Willow Springs (U.S. Department of the Interior, 975). This gage (no , drainage area 6.5 square miles) was established in 949, and records are continuous to the present. The most severe floods in the Flagg Creek basin are listed below. Approximate Recurrence Water Discharge Interval Year (cfs) (years) 96 2, , , , , ,300 7 The portion of Flagg Creek flowing within the Village of Hinsdale flows through an underground culvert. For small flood events, the flow is contained in the culvert. For large floods, the culvert becomes surcharged and ponding occurs in the low-lying areas above the underground culvert. For a portion of 59 th Street Ditch, the culvert is incapable of containing the 00-year storm, thus causing overland flow. Plainfield Road Ditch Flooding at Plainfield Road Ditch occurs on farmland just west of the Tri-State Tollway and, in a milder form, at the International Harvester Company. No buildings are flooded. In both cases, shallow channels contribute to the flooding.

19 59 th Street Ditch Flooding occurs on the 59 th Street Ditch when flow from upstream exceeds the capacity of the underground conduit system. Floodwaters flow through the subdivision known as Wood View Estates. On the east side of the subdivision, the water flows into a drainage ditch along the Tri-State Tollway. The water then flows south into 63 rd Street Ditch, then east into Flagg Creek. 63 rd Street Ditch The entire reach of 63 rd Street Ditch east of State Route 83 in the Village of Willowbrook is subject to overbank flooding as described in the Hydrologic Atlases (U.S. Department of the Interior, HA-86, 963; U.S. Department of the Interior, HA-49, 963) and the report of the Des Plaines River Steering Committee (Des Plaines River Watershed Steering Committee, 975). In addition, Wight and Company, in their Stormwater Management Study for Willowbrook, describes two areas draining to the 63 rd Street Ditch which have been flooded (Wight and Company, 977). One of these is at the corner of 59 th Street and Clarendon Hills Road where flooding is due to inadequate drainage. This area flows into Marion Hills Ditch. The other is an area of overbank flooding along 63 rd Street Ditch downstream from Lake Hinsdale to 63 rd Street Ditch near Ridgemoor Drive and Quincy Drive. 79 th Street Ditch Frequent residential damage occurs in one area in the Village of Burr Ridge. Flooding problems principally are caused by development in low lands which formerly served as natural drains. Overflow of the 79 th Street Ditch causes damage to a residence on Hamilton Avenue south of 77 th Street. The channel of this stream is not well defined in many places. This results in flooding of streets and yards in the area south of the intersection of 79 th Street and Drew Avenue. Principal Flood problems for East Branch DuPage River Watershed Flooding along the East Branch DuPage River is minimal due to the construction of Westlake Lake which is designed for a 00-year event. The total drainage area is,350 acres, most of which is residential. Lake Illini, the retention lake for the Indian Lakes subdivision, drains to the East Branch DuPage River. This development is built on a broad, shallow, perched valley. During intense rainfalls, standing water occurs in areas of equal elevation to Lake Illini. Because of a high water table of roughly 778 feet, only two feet of storage is available before the designed 00-year level of 780 feet is exceeded. The Village of Bloomingdale is studying ways to prevent this flooding, but no projects have been built as yet. 2

20 Flood stages on the East Branch DuPage River are monitored by USGS gage no The three highest recorded floods for the stream are summarized in the following tabulation (U.S. Department of the Interior, 978): FLOOD STAGES WATER-SURFACE DISCHARGE RETURN PERIOD DATE ELEVATION (cfs) (years) GAGE NO AT ARMY TRAIL ROAD EAST BRANCH DUPAGE RIVER 8/26/ /8/ /26/ The portion of the East Branch DuPage River flowing through the Village of Glen Ellyn presents the most severe flood hazard within Glen Ellyn. Recent floods along the East Branch DuPage River have occurred in April 950, October 954, September 96, and August 972. The August 972 flood produced a discharge approximately equal to the computed 50-year discharge at Maple Avenue in the Village of Lisle. Recorded crests for this flood at two Illinois Division of Water Resources crest-stage gages near Glen Ellyn are as follows (U.S. Department of the Interior, 973): Location Elevation (feet NGVD) Butterfield Road St. Charles Road Damages in the Village of Glen Ellyn from overflow of the East Branch DuPage River and accompanying storm sewer back-up problems during the 972 flood totaled approximately $500,000 for private homeowners and $40,000 for the Village of Glen Ellyn (Glen Ellyn News, 972). Since discharge data are not available for the 950, 954, and 96 floods, it is not possible to give an accurate estimate of their frequency. High water marks for these floods are indicated in (U.S. Department of the Interior, 964; U.S. Department of the Interior, 965). The East Branch DuPage River and St. Joseph Creek have been sources of greatest concern in the Village of Lisle. Flooding has been reported on the East Branch DuPage River in 948, 950, 954, 957, and 972. Flooding on St. Joseph Creek and the East Branch DuPage River in October 954 caused the evacuation of many people. Water covered parts of Ogden Avenue, State Highway 53, Burlington Street, McKinley Avenue, Dumoulin Street, and River Drive. Flood waters reached the top of the Burlington Northern Railroad overpass on Main Street. A severe thunderstorm in July 957 reportedly dropped 7.7 inches of rain in six hours in nearby Downers Grove, causing flooding along 3

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