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Flood maps, known officially as Flood Insurance Rate Maps, show areas of high- and moderate- to low-flood risk. They are shown as a series of zones. Communities use the maps to set minimum building requirements for coastal areas and floodplains; lenders use them to determine flood insurance requirements.
Flood Zones. Flood hazard areas identified on the Flood Insurance Rate Map are identified as a Special Flood Hazard Area (SFHA). SFHA are defined as the area that will be inundated by the flood event having a 1-percent chance of being equaled or exceeded in any given year.
• The official FEMA-generated flood map that shows a community’s different flood hazard areas. Flood maps are utilized by the NFIP for floodplain management, mitigation, and insurance purposes. Flood Zones. • Defined geographic areas of varying flood hazard risk.
What are FEMA Flood Zones? FEMA flood zone maps show the probability of flood risk across a geographical area. There are Flood Insurance Rate Maps (FIRMs) and Flood Hazard Boundary Maps. The zones that they depict reflect the severity of flooding in a particular area.
Flood zones are defined by type, depth, and frequency of flooding. Zones A/AE: Areas subject to inundation by the 1-percent annual-chance flood event are generally determined using approximate methodologies.
depths or base flood elevations are shown within these zones. AE The base floodplain where base flood elevations are provided. AE Zones are now used on new format FIRMs instead of A1‐A30 Zones. A1‐30 These are known as numbered A Zones (e.g., A7 or A14). This is the base floodplain
FEMA flood zones are geographic areas that the FEMA has defined according to varying levels of flood risk. A flood is any relatively high streamflow overtopping the natural or artificial banks in any reach of a stream. Each zone reflects the severity or type of flooding in the area.
In developing zone maps, FEMA focuses primarily on identifying the 1-percent annual chance floodplain (also known as the 100-year floodplain, Special Flood Hazard Area, or SFHA). As a result, FEMA maps the areas with a 1% annual chance of flooding.
Specifically, flood maps show a community’s flood zone, floodplain boundaries and base flood elevation. What is a flood map used for? Flood maps are used by the NFIP and FEMA to assess mandatory purchase requirements, building code requirements and floodplain management requirements.
The National Flood Insurance Program (NFIP) terminology index is a list of flood zone designations and floodplain management terms, plus regulations, policies, technical bulletins and guidance. For more information, please also visit FloodSmart.gov or the FloodSmart glossary.