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Indiana Department of Natural Resources

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Indiana Department of Natural Resources

Water > Surface Water > Hydrologic / Hydraulic Models & Assessments > Indiana Floodplain Mapping Indiana Floodplain Mapping

The Engineering Service Center of the Indiana Department of Natural Resources, Division of Water, provides engineering and technical support in support of Floodplain Management in Indiana.

The three Engineering Services Basin Sections (North, Central, and South) develop hydrologic and hydraulic models and floodplain maps, review technical models submitted for permits and floodplain assessments, and evaluate proposed alterations to National Flood Insurance Program studies. 

Additionally, as a Cooperating Technical Partner  with FEMA, the three Engineering Services Basin Sections are continuously identifying, delineating and updating flood hazard areas, including floodway, flood fringe, and floodplain for all the counties in the State. 

This information will be used to update the Flood insurance Studies (FIS) and Flood Insurance Rate Maps (FIRMs) in a digital format. The new flood maps will allow the State, counties and municipalities to administer a floodplain management program to decrease existing flood damages, mitigate future flood damages, and promote the health, safety, and general welfare of the people of Indiana.

The following quick links identify major programs managed by or associated with the Engineering Service Center.

Indiana Floodplain Mapping Quick Links

  • The Indiana Floodplain Information Portal
    Launch INFIP, an interactive floodplain mapping tool, which includes address searching and eFARA, the Division of Water’s on-line floodplain analysis submittal tools.  INFIP also now includes the “Best Available Data” layer, showing up to date floodplain mapping information.
  • FEMA Map Service Center
    View and download official FEMA floodplain mapping products, including Flood Insurance Rate Maps, Flood Insurance Studies, Letters of Map Change (LOMA, LOMR-F, LOMR) FIRM database information, and preliminary and historic mapping products.
  • The Indiana Hydrology and Hydraulics Model Library
    View and download previous hydrologic and hydraulic models developed for Flood Insurance Studies, Construction in a Floodway applications, Floodplain Analysis / Regulatory Assessment (FARA), and others.
  • The General Guidelines for the Hydrologic-Hydraulic Assessment of Floodplains in Indiana 
    Technical guidance documents for developing floodplain modeling for submittal to the Division of Water.  Also includes external links to other modeling information.
  • NOAA Atlas 14 Point Precipitation Frequency Estimates
    Estimates of rainfall depths and distributions for various return periods throughout the state.
  • The Indiana Peak Indiana Peak Discharge Determination System
    Launch IPDDS, the Division of Water’s hydrologic computation system.  Includes directions on how to submit information to the Division for approval. 
  • The Indiana DNR HEC-RAS Geometric Data Tool
    This tool uses the State of Indiana’s LiDAR dataset, along with the National Hydrography Dataset, to create a Geometric Input file for HEC-RAS, the Corps of Engineers hydraulic modeling program.
  • Fluvial Erosion Hazards in Indiana
    The Fluvial Erosion Hazards portal features mapping of approximate areas of stream migration for communities to better manage river corridors. The setbacks vary based on the stream’s recent migration history (mobile or non-mobile).
  • Non Levee Embankments in Indiana
    The Non-Levee Embankment project is a joint effort between The Indiana Silver Jackets, The Polis Center, IMAGIS/Indy GIS, INDNR and SIU Geography. The purpose of the project is to identify non-levee embankments (NLE) utilizing LiDAR and geoprocessing techniques. NLE are elevated linear features adjacent to waterways and within the floodplain.
  • USGS Flood Inundation Mapper
    The Flood Inundation Mapper shows estimates of flood inundation areas based on USGS stream gage information. Areas are shown based on gage height, allowing users to view the approximate limits of a flood based on a reported gage reading.
  • Floodplain Management & Homeowner Information
    More information regarding floodplain management with respect to both insurance and construction.
  • Indiana DNR Basin Teams and ESC contact information
    Contact information for the ESC section managers.
  • Frequently Asked Questions
    Answers regarding floodplain maps and flood insurance.
  • InDNR Spatial Data website
    Download spatial data related to floodplain mapping.