![]() The 1% annual chance flood is also referred to as the base flood or 100-year flood. SFHAs are defined as the area that will be inundated by the flood event having a 1% chance of being equaled or exceeded in any given year. Flood Hazardsįlood hazard areas identified on the Flood Insurance Rate Map as Special Flood Hazard Areas (SFHA). ![]() Documents include LOMAs found in the "Effective Products" and "LOMC" folders, as well as Revalidations (those LOMAs which are still considered to be effective after a map is revised). Relevant documents can be found for a particular community by choosing to "Search All Products," and finding the community by State and County. To be certain a particular LOMA is currently valid, please check relevant documentation online. This LOMA database may include LOMAs that are no longer effective. ![]() Click the LOMA point for a link to the letter (use the arrows at the top of the popup window to bring up the LOMA info, if needed). The location of the LOMA is referenced in the legal description of the letter itself. Zone X is the area determined to be outside the 500-year flood and protected by levee from the 100-year flood.Īrea of undetermined but possible flood hazards.FEMA National Flood Hazard Layer Interactive MappingįEMA Flood Insurance Rate Map information can also be found on the Nassau County Property Appraiser's Interactive Mapping site. Zone C may have ponding and local drainage problems that don't warrant a detailed study or designation as base floodplain. B Zones are also used to designate base floodplains of lesser hazards, such as areas protected by levees from the 100-year flood, or shallow-flooding areas with average depths of less than one foot or drainage areas less than 1 square mile.Īrea of minimal flood hazard, usually depicted on FIRMs as above the 500-year flood level. The coastal area subject to a velocity hazard (wave action) where BFEs are provided on the FIRM map.Īrea of moderate flood hazard, usually the area between the limits of the 100-year and 500-year floods. The coastal area subject to a velocity hazard (wave action) where BFEs are not determined on the FIRM map. The base floodplain that results from the decertification of a previously accredited flood protection system that is in the process of being restored to provide a 100-year or greater level of flood protection. BFEs are provided.Īrea to be protected from base flood by levees or Federal Flood Protection Systems under construction. Base flood depths (feet above ground) are provided. The base floodplain with sheet flow, ponding or shallow flooding. On newer FIRMs, AE Zones are the same as A1-A30 Zones (i.e., BFEs are shown). ![]() BFEs are shown on a FEMA map that includes any of these zones. Known as numbered A Zones (e.g., A7 or A14). This is often called an unnumbered A Zone or an approximate A zone. Six types of 'A' zones are described below.īase flood elevations (BFE) are not determined. Please see the table below for explanations of these zones. Whatever the area shown on a FEMA FIRM map, it may include several types of floodplain zones, each designated by a letter or a combination of a letter and number(s).
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