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<br />Tuesday, May 19 10:30 - 11:45 AM Track 8 -Local Floodplain Management - Moderator: Paul Osman
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<br />V ALLEY VIEW FLOOD CONTROL AND MITIGATION PLAN
<br />Linda M, Mele, P,E, and Meredith Seymour
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<br />The unincorporaled subdivision of Valley View is the worst flood damage area in the East Branch DtIPage River Watershed, an urbanized
<br />watershed that covers 82 square miles in the central portion of DuPage County. The flooding that occurs in the Valley View area is due
<br />mainly to overbank flooding from the East Branch, Analysis of a 40-year period of historical simulated floods showed ten million dollars
<br />of damage (assuming constant land use and dollars), Flood control planning for the subdivision utilized DuPage County Stonnwater
<br />Program technical methods: the unsteady flow model FEQ and the economic program DEC2, A steering committee guided the study;
<br />members included representatives of DuPage County, the Valley View Civic Association, the UOS, Army Corps of Engineers, major land
<br />owners in the area, the Illinois Department of Highways, Milton Township, and utility companies, The planning study, which looked at
<br />fifteen structural, nonstructural, and combination alternatives, was perfonned by DuPage County and the Corps of Engineers as a Section
<br />205 Joint Feasibility Study, The flood control plan adopted by the DuPage County Board in 1996 contained a recommendation of buyouts,
<br />floodproofing, construction ofa dam on the East Branch, and interior drainage improvements, The buyout program is well underway, and
<br />has been funded by a Hazard Mitigation OTant Program grant from FEMA, (A major flood occurred while the flood control plan was out
<br />for public review). The dam is under economic analysis to determine whether it will qualify for Corps funding. Interior drainage
<br />improvements are under construction.
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<br />TIlE STORM OVER STURM: A CASE STUDY IN MULTlJURISDlCTlONAL STORMW ATER MANAGEMENT,
<br />LAKE COUNTY, ILLINOIS
<br />Fred Royal
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<br />Over the past 25 years, residents of the Stunn Subdivision in unincorporated Lake County average at least one evacuation per year, Of the
<br />18 homes, I I are repetitively flooded and the access is blocked for the other 7. The subdivision sits in a natural depressional area with more
<br />than 180 acres tributary and surrounded by both urbanizing municipalities and hamlets with one acre lots, It became apparent that Stunn
<br />would likely never be in compliance with the NFIP without a relocation plan. Compounding that realization was up-stream development.
<br />poor soil permeability, non-functioning outlet sewers, state roadway aligrunent limiting site drainage, ,md multiple-jurisdictional opposition
<br />downstream, For this multi-phasedlmulti-faceted project to go forward, the needs and concerns of six jurisdictions had to be addressed,
<br />The concerns ranged from water quality improvements to land acquisition and flood protection. The development of a localized flood
<br />reduction and mitigation plan took over two years nad resulted in intergovenunental agreements with adjacent villages and the Township,
<br />land purchase agreements, multiple grant application and follow-up, hydrologic and hydraulic models, federal, state and local pennits, and
<br />a multi-phased design and construction approach. This multi-phased approach is now being impkmented, including the construction of
<br />storm sewers and swales, modifications to existing structures and basins, wetland mitigation and str"am assessment and maintenance. It's
<br />being funded through federal, state and local grants, including an unprecedented Lake County FEMA Hazard Mitigation Acquisition of 2
<br />homes, The total cost of the mitigation project is expecled to exceed $700,000. When the final phase is completed, the remaining residents
<br />of this subdivision will not experience the levels or frequency of disruption and economic hardship ,experienced prior to this total project.
<br />With a vision of obtainable goals, sound planning and a clear understanding of each jurisdictions' point of view, a stonnwater management
<br />and mitig-ation project such as this can be achieved,
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<br />PUTIING FLOOD HAZARD AREAS ON TIlE MAP IN LAKE COmITY, ILLINOIS
<br />Patricia S, Werner and Jacqueline Krzyzak Stickney
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<br />Flood damage is a significant problem in Lake County, Illinois. A high rate of development (and increased runofl) has exacerbated flood
<br />damages in recent years. The county's vulnerability to flood damage became obvious with floods in 1982, 1986, 1987, 1993, 1996 and
<br />1997, Since 1982, Lake County has had 2 federal and 5 state disaster declarations, Lake County is expected to continue to grow and
<br />develop with a population increase of 272,424 (+53%) and a cOlTesponding household increase of 110,524 (-H54'10) projected for the years
<br />] 990-2020 by the Northeastern lllinois Planning Commission Without significant flood hazard mitigation, flood damage and public health
<br />risk is expecled to increase in Lake County. In response to this concern, the Stonnwater Management Commission (SMC) is developing
<br />a comprehensive flood hazard mitigation plan for Lake County, Flood mitigation planning efforts began in 1995 with an inventory of more
<br />than 350 flood problem areas which required significant outreach to the 52 municipal and County ofLake governments, and meetings and
<br />interviews with homeowners associations, Using the county's GIS capabilities, all flood problem are..; are mapped and linked to a database
<br />of attribute infonnation pertaining to individual flood problem sites, Based on the inventory, flood problem hotspots have been identified
<br />and are being targeted as priority areas for mitigation. The inventory, colTesponding maps and GIS database are the basis for the flood
<br />hazard mitigation plan. In addition to flood hazard planning, the inventory is also used by permit reviewers in development pennitting, has
<br />focused SMC project proposals and is being incorporated into watershed plans throughout the county. This presentation will describe the
<br />flood problem areas inventory and the overall strategy used for identifying flood hazards in deve:loping the Lake County Flood Hazard
<br />Mitigation Plan, and will highlight the mapping tools used to visually convey flood risk infonnation to peer agencies and the public,
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