Improvements to Mapping of Alluvial Fan Flooding

by Alan A. Johnson, Federal Insurance Administration, Washington, United States,



Document Type: Proceeding Paper

Part of: Hydraulics/Hydrology of Arid Lands (H²AL)

Abstract: The Federal Emergency Management Agency (FEMA), which is responsible for identifying floodplains for the National Flood Insurance Program, is working to refine its assistance to engineers and floodplain managers by issuing revised and simplified guidance and modeling for mapping the regulatory floodplains of alluvial fan flooding. The appendix to the Flood Insurance Study Guidelines and Specifications for Study Contractors (SC Guidelines) that provides information regarding alluvial fan flooding analyses is being abridged to emphasize the production of high-quality data for use in the FEMA methodology. FEMA has also developed and released a model to be used on a personal computer (PC) that is intended to simplify the application of the FEMA alluvial fan flooding methodology. In an effort to improve the assessment of whether structural flood-control measures can effectively protect areas from the flooding associated with alluvial fan sources, FEMA has contracted with the U.S. Army Corps of Engineers (COE) to determine the parameters by which a structural measure can be evaluated.

Subject Headings: Alluvial channels | Mapping | Federal government | Floods | Insurance | Flood plains | Hydrologic models | Computer models | South Carolina | North America | United States

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