ESC (State) reviews permit applications under the Indiana Flood Control Act (IC 14-28-1) for technical accuracy and approvability with respect to the requirements of the Act. This section also maintains and updates the Indiana Best Available Floodplain Layer, including creating and updating floodplains on request, incorporating FEMA updates, and maintaining the Indiana Floodplain Information Portal (INFIP), an interactive floodplain mapping tool
INFIP offers address searching and integration with eFARA, the Division of Water’s on-line floodplain analysis submittal tools. First-time users of INFIP are encouraged to review the help document.
- Meet the ESC State Engineering Resource Team.
Indiana Floodplain Mapping
- Indiana Floodplain Mapping Story Maps
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.
- 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 “Indiana Best Available Floodplain Layer”, showing up to date floodplain mapping information.
- Indiana “Best Available” Floodplain Mapping
Download GIS data for the Indiana Best Available Floodplain Layer by county.
- 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.
Hydrology
- The Indiana Peak Discharge Determination System
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.
- USGS Streamstats
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.
- Coordinated Discharges of Selected Streams in 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.
- NOAA Atlas 14 Point Precipitation Frequency Estimates
Estimates of rainfall depths and distributions for various return periods throughout the state.
- Estimation of Peak Discharges of Indiana Streams By Using log Pearson (III) Distribution
Predictive equations developed for estimating peak flood for specified frequencies for streams in Indiana.
- Drainage Areas of Indiana Streams
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.
- Probable Maximum Precipitation Estimates
Charts of Probable Maximum Precipitation for Indiana derived from National Weather Service publications.
- Purdue Long-Term Hydrologic Impact Analysis
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.
Hydraulics
- 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.
- 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.
- 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.
- HEC-RAS at the Hydrologic Engineering Center
Website for obtaining the HEC-RAS program, including example data.
- HEC-2 Troubleshooting Guide
A guide by the Division of Water on how to handle HEC-2 datasets in HEC-RAS.
- Notes on Critical Depth Messages
Guidance on reviewing and eliminating critical depth messages in HEC-RAS modeling.
Additional information
- 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.
- Contact Us
For assistance, contact water_inquiry@dnr.IN.gov.
