An Explanation of Zone Designations
ZONE A
Areas of 100-year flood; base flood elevations and flood hazard factors not determined.
ZONE A0
Areas of 100-year shallow flooding where depths are between one (1) and three (3) feet; average depths of inundation are shown, but no flood hazard factors are determined.
ZONE AH
Areas of 100-year shallow flooding where depths are between one (1) and three (3) feet; base flood elevations are shown, but no flood hazard factors are determined.
ZONE A1-A30 or ZONE AE
Areas of 100-year flood; base flood elevations and flood factors determined.
ZONE A99
Areas of 100-year flood to be protected by flood protection system under construction; base flood elevations and flood hazard factors not determined.
ZONE B
Areas between limits of the 100-year flood and 500-year flood; or certain areas subject to 100-year flooding with depths less than (1) foot or where the contributing drainage area is less than one square mile; or areas protected by levees from the base flood.
ZONE C
Areas of minimal flooding.
ZONE D
Areas of undetermined, but possible, flood hazards.
ZONE X (no shading)
Areas determined to be outside 500-year floodplain.
ZONE X (shading)
Areas of 500-year flood; areas of 100-year flood with average depths of less than 1 foot or with drainage areas less than 1 square mile; and areas protected by levees from 100-year flood.
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