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These FIRMs are used in identifying whether a land or building is in flood zone and, if so, which of the different flood zones are in effect. In 2004, FEMA began a project to update and digitize the flood plain maps at a yearly cost of $200 million. The new maps usually take around 18 months to go from a preliminary release to the final product.
A Special Flood Hazard Area (SFHA) is an area identified by the United States Federal Emergency Management Agency (FEMA) as an area with a special flood or mudflow, and/or flood related erosion hazard, as shown on a flood hazard boundary map or flood insurance rate map. [1]
On the new maps in Palm Beach County, about 5,000 properties have moved to a high-risk flood zone, also considered a "special flood hazard area," from a low- or medium-risk flood zone.
Scientists and engineers use statistical analysis of streamflow data to determine the likelihood of flood elevations. [11] Theoretically a 100-year flood has a 1 percent chance (1/100 = 0.01 or 1 percent) of occurring in any given year and a 500-year flood has as a 0.2 percent chance (1/500 = 0.002 or 0.2 percent) of occurring in any given year ...
The maps help determine flood risks and flood insurance requirements and rates. FEMA is urging residents to look at the maps, identify problems, ask questions, and participate in the 90-day appeal ...
In St. Johns County, learn your evacuation zone by visiting the St. Johns County Emergency Management website. Knowing your zone lets you know when an evacuation has been ordered in your area.