No BFEs or flood depths are shown.Ĭoastal High Hazard Areas (CHHA) represent the area subject to inundation by 1-percent-annual chance flood, extending from offshore to the inland limit of a primary front al dune along an open coast and any other area subject to high velocity wave action from storms or seismic sources.
Zone A99 may be used only when the flood protection system has reached specified statutory progress toward completion. These are areas of special flood hazard where enough progress has been made on the construction of a protection system, such as dikes, dams, and levees, to consider it complete for insurance rating purposes. Average flood depths derived from detailed hydraulic analyses are shown within this zone.Īreas that result from the decertification of a previously accredited flood protection system that is determined to be in the process of being restored to provide base flood protection.Īreas subject to inundation by the 1-percent-annual-chance flood event, but which will ultimately be protected upon completion of an under-construction Federal flood protection system. BFEs derived from detailed hydraulic analyses are shown in this zone.Īreas subject to inundation by 1-percent-annual-chance shallow flooding (usually sheet flow on sloping terrain) where average depths are 1–3 feet. (Zone AE is used on new and revised maps in place of Zones A1–A30.)Īreas subject to inundation by 1-percent-annual-chance shallow flooding (usually areas of ponding) where average depths are 1–3 feet. Because detailed hydraulic analyses have not been performed, no Base Flood Elevations (BFEs) or flood depths are shown.Īreas subject to inundation by the 1-percent-annual-chance flood event determined by detailed methods. Federal floodplain management regulations and mandatory flood insurance purchase requirements apply in these zones.Īreas subject to inundation by the 1-percent-annual-chance flood event. Structures located within the SFHA have a 26-percent chance of flooding during the life of a standard 30-year mortgage. Special Flood Hazard Areas represent the area subject to inundation by 1-percent-annual chance flood.
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