Base flood elevation meaning1/5/2024 ![]() ![]() National Flood Insurance Program Requirements 59. AR: 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. Base Flood Elevations (BFEs) are typically shown on Flood Insurance Rate Maps (FIRMs).Base flood depths (feet above ground) are provided. AO: The base floodplain with sheet flow, ponding or shallow flooding.AE Zone delineations are now used on new format FIRMs instead of A1-A30 Zones. The flood having a 1-percent chance of being equaled or exceeded in any given year. AE: The base floodplain where base flood elevations are provided.This is the base floodplain where the FIRM shows a base flood elevation (old format). A1-A30: These are known as numbered A Zones (e.g., A7 or A14).This is often called an unnumbered A Zone or an approximate A Zone. A: The base flood mapped by approximate method, i.e., base flood elevations is not provided.Mandatory flood insurance purchase applies in these zones. Zone "A" (and its sub-designations: AE, AH, AO and A1-A99). Flood Elevation (BFE) is the water-surface elevation of the 1 annual chance flood.A map layer which indicates whether an area is designated as a V or A flood hazard zone and which provides the 0.2 Advisory Flood Elevation and the 1 Advisory Base Flood Elevation (ABFE) in feet referenced to the North American Vertical Datum of 1988 (NAV88) for the zone. Some zones have multiple sub-designations, as follows: Advisory Base Flood Elevation (ABFE) Zones. A non-residential structure may be elevated or dry. There are six (6) flood zone designations. A residential structure built in a Special Flood Hazard Area must be elevated above the Base Flood Elevation. ![]()
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