Development of impervious cover prevents the infiltration of rainwater and generates stormwater runoff, while climate change results in more frequent and intense storm events. The low category of the urban flooding susceptibility index identifies locations that are less susceptible to urban flooding in the region. Unmapped Special Flood Hazard Areas (SFHA) (pdf), Destined for DFIRMs - stream studies becoming flood maps. Counties that were under at least a partial flood advisory include Cook, DeKalb, DuPage, Kane, Kendall, LaSalle, Lee and Will. Currently, highway and street design and reconstruction requirements do not reflect county-specific stormwater management goals or practices. In the CMAP region, three out of four people living in economically disconnected and disinvested areas are also living in the areas most susceptible to urban flooding. Collect flooding data and communicate risk and possible solutions to residents and businesses, with particular attention to residents who may be more vulnerable to the impacts of flooding. Local governments can be proactive about addressing flooding challenges by going beyond county requirements to require stormwater best management practices on smaller parcels. Note: Economically Disconnected and Disinvested areas are more likely to be in flood susceptible locations.However, this varies by county and is most … Public rights of way often present good opportunities for green infrastructure. Watershed plans, stormwater models, and other studies help the region identify the most effective stormwater solutions, and coordination of these tools can help address problems across jurisdictional boundaries. The NFIP does not adequately communicate the level of risk, set premiums to reflect the full risk of loss, or provide options for low income property owners. According to FEMA, nearly 40 percent of small businesses never reopen after a flooding disaster. Counties that were under at least a partial flood … Integrating stormwater management into larger planning can help coordinate investments and leverage limited resources to address flooding while achieving other community goals. The Illinois State Water Survey is providing preliminary and pending Flood Insurance Rate Maps on this web site. It's the 27th named storm in this hurricane season, nearly the most ever. Planning in advance of potential flooding can reduce risks to health and safety as well as costs and damages to private and public property and infrastructure. While these areas typically have less impervious cover than high scoring locations, some areas may still experience localized flooding. The National Weather Service issued a flood issued flood and dense fog advisories for much of northern Illinois early Thursday as between 1.5 and 3 inches of rain fell from Wednesday … ON TO 2050 reaffirms GO TO 2040’s recommendation to integrate planning with water resource management. Counties with hash marks have some panels currently in the process of being revised. When flooding does occur, it does not affect all populations or communities equally. Extreme precipitation events in the central U.S. increased as much as 40 percent between 1979 and 2009 compared to the previous 30 years (1948-1978). Counties in green have become effective. Distributed by Tribune Content Agency, LLC. In Chicago, many basements and streets were at least partially underwater on Sunday, but the flooding was most visible in the Loop, where the Chicago River spilled over onto the … CNT found that wet basements can decrease property values by 10 to 25 percent and are cited as a primary reason for not purchasing a home. CMAP has developed the Regional Urban Flood Susceptibility Index to help prioritize areas for planning and mitigation investment, particularly in locations with local government capacity constraints that make it difficult to address these challenges. Reform the NFIP to adequately identify and communicate risk. It also has National Flood Insurance Program (NFIP) community information, map panel information, cross section and hydraulic structure information, and base map information like road, stream, and public land survey data. Larger scale green infrastructure restoration and acquisition could help reduce flooding in downstream areas. County and municipal governments should work to better understand where flooding is occurring and identify potential solutions. Green infrastructure has the potential to improve our flood control and stormwater system while achieving co-benefits unavailable with gray infrastructure solutions. A range of stormwater management activities should be prioritized in areas of higher flood susceptibility. Chicago Metropolitan Agency for Planning, 2018. However, development in significant portions of the region predated modern stormwater management standards, and even current infrastructure design specifications rely on old data and do not account for a changing climate. Chicago Metropolitan Agency for Planning, 2018. Flood zones are indicated in a community’s flood map. As reported in the New York Times, Chicago has 75,000 properties that are at risk of flooding, even though they don’t show up that way on Federal Emergency Management Agency maps. The flood data is scale dependent and is set to show from 1:3,000,000. Preliminary maps are not official, and are not to be reproduced or used as official FEMA maps until they are finalized. Areas receiving a mid-range score in the urban index are often served with separate storm sewers and may have been developed with floodplain and stormwater management practices. Projects that comprehensively address stormwater management solutions can improve the performance of our transportation system while also reducing flooding damages in nearby neighborhoods. Maintaining existing infrastructure, including green infrastructure, is a priority to ensure that these systems continue to perform. Update plans and development standards to improve stormwater and floodplain management. Use the Regional Urban Flood Susceptibility Index, along with other mapping, planning, and modeling efforts to prioritize flood mitigation investments. This provision could enhance how stormwater management is addressed in overall planning efforts as well as individual surface transportation projects. The highest scoring areas of the index often have a combination of factors that make them more susceptible.

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