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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