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Flood Modernization

  Flood Map Modernization   


The Federal Emergency Management Agency (FEMA), a division in the Department of Homeland Security, and the Illinois Department of Natural Resources (IDNR) have entered into a Cooperative Technical Agreement to modernize Flood Insurance Rate Maps (FIRMs) in Illinois. These maps are used to support the National Flood Insurance Program (NFIP) and floodplain management activities.

The Map Modernization Program uses state-of-the-art technology, engineering and digital mapping standards to deliver more reliable digital flood hazard data and maps in a Geographic Information Systems (GIS) format.  Under the Cooperative Technical Agreement, the Office of Water Resources (OWR) and the State Water Survey (SWS), both of IDNR, will complete map modernization activities for nearly all of the 102 counties in Illinois over a five-year period ending in 2010.  OWR is responsible for administration of the cooperative agreement with FEMA, public outreach, project scoping, and numerous activities (some dictated by Federal Statute) that culminate in the finalization of revised FIRMs and Flood Insurance Studies (FIS). The SWS will address all engineering and mapping matters related to modernization of the maps, as well as provide new data to update the FIS for each county. The SWS creates the Technical Standards Data Notebook (TSDN) which documents activities undertaken and completed in each county project.


  • Improve flood plain management

  • Up-to-date, standardize digital flood maps in arcGIS geodatabase format

  • Seamless, nationwide flood layer

  • Final maps available through FEMA's Multi-hazard Information Platform (MIP)

  • Local involvement in map revisions



Flood Map Modernization

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