![]() This is the base floodplain where the FIRM shows a BFE (old format).ĪE The base floodplain where base flood elevations are provided. This is often called an unnumbered A Zone or an approximate A Zone.Ī1–30 These are known as numbered A Zones (e.g., A7 or A14). There are seven types of A Zones:Ī The base floodplain mapped by approximate methods, i.e., BFEs are not determined. Special siting and design restrictions and requirements exist for each of these areas. The most hazardous floodplain areas will generally be close to coastal shorelines (zone V, also called the coastal high hazard area-CHHA), floodways (areas closest to the centerline of major streams and rivers-see illustration below), and alluvial fans. "V" zones are mapped exclusively in coastal floodplains. "A" zones can be mapped in inland or coastal floodplains.
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