This site contains economic flood damage assessment models developed by NRCS. The older DOS URB1 and ECON2 models are formulated specifically to look at urban and rural flood damages in PL566 sized watersheds. They take flow frequencies and cross sectional rating curves import directly from the NRCS programs, WSP2 and TR20. These programs can also be used with the appropriate USACE programs like HEC2. The current version of ECON2 and URB1 was last revised 1991, and are being replaced with the new Flood Econ program and the USACE HEC-FDA program.
The Hydrologic Engineering Center's Flood Damage Analysis (HEC-FDA) computer program is designed to assist Corps of Engineers study team members in using risk-based analysis methods for flood-damage-reduction studies as required by the Corps (EM 1110-2-1419). The approach explicitly incorporates descriptions of uncertainty of key parameters and functions into project benefit and performance analyses. The following is a description of how HEC-FDA is used in flood-damage-reductions studies during plan development. Bob Carl (HEC) is the USACE contact with NRCS on this model. Current software and documentation are available at http://www.hec.usace.army.mil/software/hec-fda/index.htmlCCE Certification of HEC FDA
HEC-FDA has been used by NRCS Economists Lauren Cartwright, (573-876-5015), Kent Hardmeyer (732-537-6055) and Colleen Tennity. In January, 2005, 20 NRCS economists received training on the HEC-FDA model at the USACE Hydrologic Engineering Center in Davis, CA. Many NRCS watershed staff are now converting to this model. Bentley Creek, PA HEC-FDA Example files developed by Colleen Tennity.
The NRCS URB1, ECON2, and CARE models have been combined by George Forster at ITC into a CCEinstallation package at fdatools.exe. Being a CCE installation, you need an administrative login to install fdatools.exe on a CCE machine. Otherwise you can just download the DOS programs and run them directly in a Command Prompt window.
P&G 2.4.12(b) allows reductions in the administrative costs associated with the NFIP to be claimed as NED benefits in those alternatives which effectively remove properties from the 100-year floodplain. The attached spreadsheet shows the derivation of the average annual administrative expenses per-policy over the period 2000-2004 of $167 (2007-QII dollar terms, as of August 30, 2007). As far as I can tell, these are the latest published data.