Floodplain Maps and Studies
In support of the NFIP, FEMA has issued Flood Insurance Rate Maps (FIRM) for most NFIP participating communities in New Hampshire. FIRMs identify areas with a one percent annual chance flood hazard in a community. These areas are called Special Flood Hazard Areas (SFHA). The one percent annual chance flood is also referred to as the base flood or 100-year flood. The flood hazards areas shown on FIRMs are based on the best information available at the time the maps were prepared.
Floodplain Maps - Includes information and links on where to view the FEMA floodplain maps for NH communities.
Floodplain Map Changes - Includes information about the application processes that are required to change FEMA's floodplain maps.
Flood Studies and Data - Includes information about the FEMA Flood Insurance Studies, which accompany the floodplain maps, and other flood studies and data developed by other federal and state agencies.
Map Modernization/Risk MAP Programs - Includes information about FEMA's recent two programs to update the nation's floodplain maps.
Vertical Datum - Includes information about the vertical datum that is currently used on the floodplain maps in all counties in New Hampshire.
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