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.



• 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 video.



• Feedback Method - Comments regarding the Flood Inundation Maps can be made here.