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Indiana Floodplain Mapping

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

The three Engineering Services Basin Sections (North, Fundamental, 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 Technology Services Basin Sections are continuously identifying, delineating and updating flood hazard areas, including floodway, flood fringe, and floodplain for all the counties in the Land.

This information volition be used to update the Flood insurance Studies (FIS) and Overflowing Insurance Charge per unit Maps (FIRMs) in a digital format. The new inundation maps volition let the State, counties and municipalities to administrate a floodplain management program to decrease existing overflowing amercement, mitigate future flood damages, and promote the health, safety, and full general welfare of the people of Indiana.

The following quick links identify major programs managed by or associated with the Applied science Service Heart.

Indiana Floodplain Mapping Quick Links

Indiana Floodplain Mapping

• Indiana Floodplain Mapping Story Maps
  The Division of H2o, 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)
• The Indiana Floodplain Data Portal
  Launch INFIP, an interactive floodplain mapping tool, which includes address searching and eFARA, the Segmentation of Water'southward on-line floodplain assay submittal tools. INFIP likewise now includes the "Indiana Best Bachelor Floodplain Layer", showing upward to date floodplain mapping information.
• Indiana "Best Available" Floodplain Mapping
  Download GIS data for the Indiana All-time Available Floodplain Layer past county.
• Interim Digital FIRMs
  Digital versions of historic Flood Insurance Rate Maps from 2004.  Utilise for historic and research purposes only.

Floodplain Management Links

• Indiana Floodplain Mapping
  An ESRI Story Map depicting various sources for Floodplain Mapping for Indiana.
• FEMA Map Service Center
  View and download official FEMA floodplain mapping products, including Flood Insurance Charge per unit Maps, Overflowing Insurance Studies, Letters of Map Change (Loma, LOMR-F, LOMR) Business firm database information, and preliminary and historic mapping products.
• 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 data.
• USGS Alluvion Overflowing Mapper
  The Flood Overflowing Mapper shows estimates of inundation inundation areas based on USGS stream gage information. Areas are shown based on cuff height, allowing users to view the approximate limits of a inundation based on a reported gage reading.
• Floodplain Management & Homeowner Information
  More than data regarding floodplain management with respect to both insurance and construction.

Hydrology Links

• The Indiana Peak Indiana Peak Discharge Determination Organisation
  Launch IPDDS, the Division of Water'due south hydrologic ciphering system.  Includes directions on how to submit information to the Division for approval.
• USGS Streamstats
  StreamStats for Indiana incorporates regression equations for estimating peak-menstruum frequency statistics at the x-, 25-, 50-, 100-, 200-, and 500-twelvemonth recurrence intervals (equivalent to the 10-, 4-, ii-, one-, 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 cantankerous-sectional expanse 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 half-dozen, 1976, the U.S. Soil Conservation Service (now known equally the Natural Resources Conservation Service), the U. South. Geological Survey (USGS), the U. S. Ground forces Corps of Engineers (Louisville, Detroit and Chicago Districts) and the Indiana Department of Natural Resources (IDNR) mutually agreed to coordinated belch-frequency values for use in water resources investigations and planning activities in the State of Indiana.
• NOAA Atlas fourteen Point Precipitation Frequency Estimates
  Estimates of rainfall depths and distributions for various render periods throughout the state.
• Estimation of Summit Discharges of Indiana Streams Past Using log Pearson (III) Distribution:
  Predictive equations developed for estimating peak overflowing for specified frequencies for streams in Indiana.
• Drainage Areas of Indiana Streams
  Drainage areas for all Indiana streams having a drainage expanse of at least five square miles are adamant. 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 Atmospheric precipitation for Indiana derived from National Weather Service publications.
• Purdue Long-Term Hydrologic Affect Assay
  Purdue Long-Term Hydrologic Affect Analysis (LTHIA-IN) is a website that tin can be used to delineate watersheds and determine peak discharges using NRCS TR-55 methods.

Hydraulics Links

• 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 Indiana DNR HEC-RAS Geometric Data Tool
  This tool uses the State of Indiana'southward 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 Technology Eye
  Website for obtaining the HEC-RAS programme, including example information.
• 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 letters in HEC-RAS modeling.

Other Floodplain Data

• Fluvial Erosion Hazards in Indiana
  The Fluvial Erosion Hazards portal features mapping of approximate areas of stream migration for communities to improve manage river corridors. The setbacks vary based on the stream'south recent migration history (mobile or non-mobile).
  • Download data
• Non Levee Embankments in Indiana
  The Non-Levee Embankment project is a joint effort between The Indiana Silver Jackets, The Polis Centre, 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 inside the floodplain.
  • Download data
• Indiana DNR Bowl Teams and ESC contact data
• Contact information for the ESC section managers.
• Frequently Asked Questions
  Answers regarding floodplain maps and flood insurance.

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