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Federal Energy Regulatory Commission

Industries Hydropower Dam Safety and Inspections RIDM - Regulations, Guidelines and Manuals

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Engineering Guidelines for the Evaluation of Hydropower Projects

Chapter 2 Selecting and Accommodating Inflow Design Floods for Dams, (Final Version)

The Division of Dam Safety and Inspections, Office of Energy Projects, has revised Chapter 2 of the Engineering Guidelines on Selecting and Accommodating Inflow Design Floods for Dams. The guidelines are revised to replace the recommendation to perform dam break analyses using the NWS DAMBRK and FLOODWAV Models which are no longer supported by the National Weather Service. The revised guidelines state HEC-RAS is the recommended one-dimensional model to use for performing dam break analyses but allow the use of the other one-dimensional and two-dimensional models if pre-agreed to by the Commission. The guidelines state that existing analyses using NWS DAMBRK and FLDWAV are still acceptable, but any new or revised analyses should not use these models. The guidelines also update some definitions and remove references to obsolete/superseded documents.

A detailed description of all changes is described by following this link: Revisions PDF