General Guidelines for the Hydrologic-Hydraulic Assessment

-General Guidelines for the Hydrologic-Hydraulic Assessment of Floodplains in Indiana was created to assist the floodplain management community in establishing base flood elevations and floodway limits and in evaluating projects in accordance with the Indiana Flood Control Act and the National Flood Insurance Program. The guidelines detail methods acceptable to both the Indiana Department of Natural Resources (IDNR) and the Federal Emergency Management Agency (FEMA) with respect to hydrologic and hydraulic modeling and floodplain mapping. Also included in this guide are recommendations on presenting results of a floodplain study and other useful reference material.

• Executive Summary
• Chapter 1: Introduction (Updated March 2015)
• Chapter 2: Obtaining a Floodplain Determination for a Minor Site Assessment (updated August 2014)
• Chapter 2.5: Non-modeling Assessment Approaches Used by the IDNR (updated June 2014)
• Chapter 3: Overview of the Process for Performing a Detailed Floodplain Analysis (updated August 2014)
• Chapter 4: Mapping Standards and Methods (updated December 2014)
• Chapter 5: Surveying Standards and Methods (updated June 2014)
• Chapter 6: Researching and Evaluating Existing Models (Updated March 2015)
• Chapter 7: Guidelines for determining peak discharges
• Chapter 8: Guidelines for Hydraulic Modeling Using HEC-RAS (updated August 2016)
• Chapter 9: Guidelines for Alternate Hydraulic Models (updated February 2016)
• Chapter 10: Presentation of Modeling Results (updated October 2014)
• Bibliography
• Appendices (under construction)
  • LOMRs, Flood Control Projects, & Levees
  • Flow Chart: Overview for Floodplain Analysis
• Hydraulic modeling checklist (updated June 2014)

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