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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.
• 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.
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. 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.
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.
Flood zones are determined by examining a combination of historical flood data, rainfall patterns, topography, river flow data, and the presence of flood control structures like dams and levees. FEMA uses this data to create official Flood Insurance Rate Maps (FIRMs), which show flood hazards.
A flood zone is a defined geographic area with a specific flood hazard risk. It represents the probability and impact of flooding on that area and is used to determine insurance requirements and costs. Flood zones are shown collectively on a flood map.
FEMA flood zone maps are a powerful tool to help identify the dangers of flooding in your area. The maps, known officially as Flood Insurance Rate Maps (FIRMs), show designated flood zones of high, moderate, and low flood risk.
FEMA flood maps are a useful tool you can access to gain awareness of the chances of flooding in your area. These maps divide areas into risk zones indicating the frequency and severity of flooding. Each map includes an index page and a legend explaining any numbers and symbols that appear on it.
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.