Zone A99: Areas subject to inundation by the one percent annual chance flood event, but which will ultimately be protected upon completion of an under-construction Federal flood protection system. Mandatory flood insurance purchase requirements apply. Zone AR: Areas 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. Average flood depths derived from detailed hydraulic analyses are shown within this zone. Zone AH: Areas subject to inundation by one percent annual chance shallow flooding (usually areas of ponding) where average depths are between one and three feet. Zone AO: Areas subject to inundation by one percent annual chance shallow flooding (usually sheet flow on sloping terrain) where average depths are between one and three feet. (Zone AE is on new and revised maps in place of Zones A1 – A30.) Base flood elevations are shown within these zones. Zone AE and A1 – A30: Areas subject to inundation by the one percent annual chance flood event determined by detailed methods. Because detailed hydraulic analyses have not been performed, no base flood elevation or depths are shown. Zone A: Areas subject to inundation by the one percent annual chance flood event. ![]() These areas are labeled as Zone A, Zone AE, Zones A1 – A30, Zone AO, Zone AH, Zone AR and Zone A99 on a FIRM or FHBM. In A zones, floodwaters may move slowly or rapidly, but waves are usually not a significant threat to buildings. “ A zone” means portions of the SFHA in which the principal source of flooding is runoff from rainfall, snowmelt, or a combination of both.
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