State Engineering Resources

The Division of Water, along with our partners, have put together a series of ESRI Story Maps that provide details on the derivation and use of Floodplain Mapping in Indiana.

• DNR Embraces the Use of Technology to Communicate Flood Risks (FEMA / DNR)

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 “Indiana Best Available Floodplain Layer”, showing up to date floodplain mapping information.

Download GIS data for the Indiana Best Available Floodplain Layer by county.

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.

More information regarding floodplain management with respect to both insurance and construction.

Launch IPDDS, the Division of Water’s hydrologic computation system, is being rebuilt to accommodate state-wide changes in GIS systems.

NEW

Starting August 2024, the Division has created a tool for submitting discharge determination requests to our office while the IPDDS tool is down. Please use the link and follow the instructions to submit a discharge determination request to the DNR Division of Water.  Email water_inquiry@dnr.in.gov with any questions.

StreamStats for Indiana incorporates regression equations for estimating peak-flow frequency statistics at the 10-, 25-, 50-, 100-, 200-, and 500-year recurrence intervals (equivalent to the 10-, 4-, 2-, 1-, 0.5-, and 0.2-percent annual exceedance probabilities, respectively) for unregulated streams throughout Indiana, and equations for estimating bankfull-channel dimensions of width, mean depth, and cross-sectional area for non-urban wadeable streams in the three largest physiographic regions of Indiana.

By a Memorandum of Understanding of May 6, 1976, the U.S. Soil Conservation Service (now known as the Natural Resources Conservation Service), the U. S. Geological Survey (USGS), the U.S. Army Corps of Engineers (Louisville, Detroit and Chicago Districts) and the Indiana Department of Natural Resources (IDNR) mutually agreed to coordinated discharge-frequency values for use in water resources investigations and planning activities in the State of Indiana.

Estimates of rainfall depths and distributions for various return periods throughout the state.

Predictive equations developed for estimating peak flood for specified frequencies for streams in Indiana.

Drainage areas for all Indiana streams having a drainage area of at least five square miles are determined. Drainage areas at many other points, including entry and exit points for larger streams crossing the Indiana border, were also determined.

Charts of Probable Maximum Precipitation for Indiana derived from National Weather Service publications.

Purdue Long-Term Hydrologic Impact Analysis (LTHIA-IN) is a website that can be used to delineate watersheds and determine peak discharges using NRCS TR-55 methods.

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.

• 9/13/2023: The newest Model Library viewer has been completed and ready for use. This library is designed more along the lines of the old map viewer, where you will be able to select models from segments of streams. If you have any questions please notify water_inquiry@dnr.IN.gov.

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.

Website for obtaining the HEC-RAS program, including example data.

A guide by the Division of Water on how to handle HEC-2 datasets in HEC-RAS.

Guidance on reviewing and eliminating critical depth messages in HEC-RAS modeling.

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).

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.

For assistance, contact water_inquiry@dnr.IN.gov.