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      USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.

      About Inundation

      • Product Description - The Flood Inundation Map Graphics show the lateral extent of projected flooding on local map backgrounds.

      • Purpose/Intended Use - Flood Inundation Maps will show the extent of flooding expected spatially over a given area. This will indicate when roadways, streets, buildings, airports, etc. are likely to be impacted by floodwaters. The accuracy of the mapping depends on the degree of accuracy of DEM data available for use in the GIS application, plus other factors.

      • Flood Mapping Guidelines - The guidelines for the creation of these AHPS Flood Inundation Map libraries are contained in the following link: NOAA AHPS Guidelines Final 2011 v3

      • Product Development Template Spreadsheet - scope, track, and monitor AHPS FIM projects Product Development Template Spreadsheet.

      • Audience - The initial target audience is the state and local agencies that must make emergency operational decisions during flooding events. However, since the graphics are easy to view, anyone with an interest during these events can make use of the maps, including the Federal Emergency Management Agency (FEMA), the U.S. Geological Survey (USGS), Corps of Engineers (COE), state and local emergency managers, the media, and the general public.

      • Presentation Format - The Flood Inundation Maps are web-based graphics. A text version of the actual river forecast numbers is available on the AHPS hydrograph page.

      • Movie - An overview of the Flood Inundation Mapping Services is available here as a YouTube logovideo.

      • Feedback Method - Comments regarding the Flood Inundation Maps can be made here.
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      The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.

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