This page provides policy information on how to use the Hydrologic Engineering Centers River Analysis System (HEC-RAS) software program in the National Flood Insurance Program (NFIP) for flood hazard mapping activities. The U.S. Army Corps of Engineers developed HEC-RAS to replace the HEC-2 hydraulic model. This page is intended for FEMA mapping contractors and other mapping professionals.
View and download the Policy for the Use of HEC-RAS in the National Flood Insurance Program (Apr 2001) memorandum that addresses the policy for the use of HEC-RAS to replace HEC-2 models for flood hazard mapping efforts for the National Flood Insurance Program (NFIP).
View and download the HEC-RAS Version Update memorandum that addresses the decision making process that FEMA contractors and mapping partners should apply to flood map revision requests involving HEC-RAS.