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Flood Map Codes:
SPECIAL FLOOD HAZARD AREAS INUNDATED BY 100-YEAR FLOOD
ZONE A No base flood elevations determined.
ZONE AE Base flood elevations determined.
ZONE AH Flood depths of 1 to 3 feet (usually areas of ponding); base flood elevation determined.
ZONE AO Flood depths of 1 to 3 feet (usually sheet flow on sloping terrain); average depths determined. For areas of alluvial fan flooding velocities also determined.
ZONE A99 To be protected from 100-year flood by Federal flood protection system under construction; no base flood elevations determined.
ZONE V Coastal flood with velocity hazard (wave action); no base flood elevations determined.
ZONE VE Coastal flood with velocity hazard (wave action); base flood elevations determined.
ZONE AR Zone AR is the flood insurance rate zone used to depict areas protected from flood hazards by flood control structures, such as a leeve, that are being restored. FEMA will consider using the Zone AR designation for a community if the flood protection system has been deemed restorable by a Federal agency in consultation with a local project sponsor; a minimum level of flood protection system is scheduled to begin within a designated time period and in accordance with a progress plan negotiated between the community and FEMA. Mandatory purchase requirements for flood insurance will apply in Zone AR, but the rate will not exceed the rate of unnumbered A zones if the structure is built in cofloodplain management regulations. For floodplain management in Zone AR areas, elevation is not required for improvements to existing structures. However, for new construction, the structure must be elevated (or flood proofed for non-residential structures) such that the lowest floor, including basement, is the maximum of 3 feet above the highest adjacent existing grade if the depth of the base flood elevation (BFE) does not exceed 5 feet at the proposed development site. For infill sites, rehabilitation of the existing structures, regardless of the depth of the BFE at the project site, the AR designation will be removed and the restored flood control system shown as providing protection from the 1% annual chance of flooding on the the NFIP map upon completion of the restoration project and submittal of all necessary data to FEMA.

 

 
FLOODWAY AREAS IN ZONE AE

 

 
OTHER FLOOD AREAS
ZONE X Areas of 500-year flood; areas of 100-year flood with average depths of less than one foot or width drainage areas less than one square mile and areas protected by levees from 100-year flood.
ZONE B Zone B is the flood insurance rate zone that corresponds to areas outside the 100-year floodplains, areas of 100-year sheet flow flooding where average depths are less than one foot, areas of 100-year stream flooding where the contributing drainage area is less than one square mile, or areas protected from the 100-year flood by a levee are shown within this zone.

 

 
OTHER AREAS
ZONE X Areas determined to be 500-year floodplain.
ZONE D Areas in which flood hazards are undetermined.
ZONE C Zone C is the flood insurance rate zone that corresponds to areas outside of the 100-year floodplain, areas of 100-year sheet flow flooding where average depths are less than one foot, areas of 100-year stream flooding where the contributing drainage area is less than one square mile, or areas protected from a 100-year flood by a levee are shown within this zone.

 

 
ZONE A
ZONE A Zone A is the flood insurance rate zone that corresponds to the 100-year floodplains that are determined by the Flood Insurance Study (FIS) by approximate methods. Because detailed hydraulic analyses are not performed for such areas, no BFEs or depths are shown within this zone. Mandatory flood insurance requirement apply.

 

 

 

 



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