Zone B and X (Shaded): Area of moderate flood hazard, usually the area between the limits of the 100‐ year and 500‐year floods.Mandatory flood insurance purchase requirements will apply, but rates will not exceed the rates for unnumbered A zones if the structure is built or restored in compliance with Zone AR floodplain management regulations. Zone AR: Areas with a temporarily increased flood risk due to the building or restoration of a flood control system (such as a levee or a dam).Average flood depths derived from detailed analyses are shown within these zones. These areas have a 26% chance of flooding over the life of a 30‐year mortgage. Zone AO: River or stream flood hazard areas, and areas with a 1% or greater chance of shallow flooding each year, usually in the form of sheet flow, with an average depth ranging from 1 to 3 feet.Base flood elevations derived from detailed analyses are shown at selected intervals within these zones. Zone AH: Areas with a 1% annual chance of shallow flooding, usually in the form of a pond, with an average depth ranging from 1 to 3 feet.AE Zones are now used on new format FIRMs instead of A1‐A30 Zones. Zone AE: The base floodplain where base flood elevations are provided.This is the base floodplain where the FIRM shows a BFE (old format). A1-A30: These are known as numbered A Zones (e.g., A7 or A14). Because detailed analyses are not performed for such areas no depths or base flood elevations are shown within these zones.
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