The Flood Damage Reduction Analysis (HEC-FDA) software developed by the U.S. Army Corps of Engineers' (USACE) Hydrologic Engineering Center (CEIWR-HEC) provides the capability to perform an integrated hydrologic engineering and economic analysis during the formulation and evaluation of flood risk management plans. HEC-FDA is designed to assist USACE study members in using risk assessment procedures for formulating and evaluating flood risk management measures pursuant to pertinent policy and guidance (EM 1110-2-1619, ER 1105-2-101). The software assists USACE staff in analyzing the economics of flood risk management projects. The HEC-FDA software:

• Stores hydrologic, hydraulic, and economic data necessary for an analysis
• Provides tools to visualize data and results
• Computes expected annual damage (EAD) and equivalent annual damage (EqAD)
• Computes annual exceedance probability (AEP) and assurance as required for NFIP levee certification
• Implements the risk assessment procedures described in EM 1110-2-1619 and provides outputs to the user that allow teams to describe results in compliance with ER 1105-2-101

HEC-FDA software follows functional elements of a study involving coordinated study layout and configuration, hydrologic and hydraulic engineering modeling, economic analyses, and plan formulation and evaluation. HEC-FDA is used continuously throughout the planning process as the study evolves from the base year without-project condition assessment through the assessments of alternative plans over their project life. Engineering modeling and portions of the economics are performed separately, but in a coordinated manner after specifying the study configuration and layout, and merged for the formulation and evaluation of the potential flood risk management plans.