Name: Flood Hazard - IDNR (Best Available) 2025 Jul 15

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Description: The Indiana Best Available Floodplain MappingThe Indiana DNR Division of Water has undertaken a project to create and update traditional Flood Insurance Rate Maps, which are published by FEMA, to include many more stream reaches than are currently officially published in the National Flood Hazard Layer. These additional floodplain data include more than 18,000 stream miles of “Zone A” quality studies, with Base Flood Elevations and Floodway included. This page serves as a resource for obtaining the updated floodplain data for use in a local or county GIS, and for further analysis and planning.Data Sources:The Indiana Floodplain Information PortalThe Indiana Floodplain Information Portal (INFIP) is a mapping application developed by the DNR, Division of Water that provides floodplain information for public use. The portal displays floodplain information from both FEMA and DNR sources, including mapped floodplains and flood elevation points along waterways. In addition, the revised INFIP allows users to generate a Floodplain Analysis and Regulatory Assessment (FARA) by using the FARA Report Generator. A FARA is required for local floodplain permitting and FEMA Letter of Map Amendment applications in A zones.A FARA is also required for regulatory determination when the upstream drainage area is greater than 1 square mile, for areas that are unmapped on the FIRM, or for areas known to be flood prone.Base Flood Elevation (BFE) determinations are often used for proposed development and flood insurance purposes.The Indiana Floodplain Information Portal (INFIP) displays the Best Available Floodplain mapping as well as the BFE.The layers tab allows the user to view the effective layer.A FARA can be generated by selecting “run” once a point is selected.A BFE will be provided for the site, then the FARA should be downloaded and saved by the user for future reference.There is the opportunity for users to submit a site for review if they wish to contest the FARA, if their site is near a stream without a mapped floodplain/floodway, or if their point is nearest to a stream with no floodplain and the tool took the BFE from a different stream.

Copyright Text: IDNR

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• Value: X,IDNR_MR,0.2 PCT ANNUAL CHANCE FLOOD HAZARD
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• Value: X,NFHL,0.2 PCT ANNUAL CHANCE FLOOD HAZARD CONTAINED IN CHANNEL
  Label: Additional Floodplain Area; DNR .2 Percent Flood Hazard
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