Flood Zone Designation

Flood Zone Designation

Flood Zone Designation

Zone V An area inundated by 1% annual chance flooding with velocity hazard (wave action); no BFEs have been determined.
Zone VE An area inundated by 1% annual chance flooding with velocity hazard (wave action); BFEs have been determined.
Zone A An area inundated by 1% annual chance flooding, for which no BFEs have been determined.
Zone AE An area inundated by 1% annual chance flooding, for which BFEs have been determined.
Zone AO An area inundated by 1% annual chance flooding (usually sheet flow on sloping terrain), for which average depths have been determined; flood depths range from 1 to 3 feet.
Zone AO (Alluvial Fan) An alluvial fan inundated by 1% annual chance flooding (usually sheet flow on sloping terrain), for which average flood depths and velocities have been determined; flood depths range from 1 to 3 feet.
Zone AH An area inundated by 1% annual chance flooding (usually an area of ponding), for which BFEs have been determined; flood depths range from 1 to 3 feet.
Zone A99 An area inundated by 1% annual chance flooding, for which no BFEs have been determined. This is an area to be protected from the 1% annual chance flood by a Federal flood protection system under construction.
Zone D An area of undetermined but possible flood hazards.
Zone AR (Future) An area inundated by flooding, for which BFEs or average depths have been determined. This is an area that was previously, and will again, be protected from the 1% annual chance flood by a Federal flood protection system whose restoration is Federally funded and underway.
Zone X500 (0.2% Annual Chance) An area inundated by 0.2% annual chance flooding; an area inundated by 1% annual chance flooding with average depths of less than 1 foot or with drainage areas less than 1 square mile; or an area protected by levees from 1% annual chance flooding.
Zone X An area that is determined to be outside the 1% and 0.2% annual chance floodplains.
Zone 100IC (1% Annual Chance Flood Discharge Contained in Channel) An area where the 1% annual chance flooding is contained within the channel banks and the channel is too narrow to show to scale. An arbitrary channel width of 3 meters is shown. BFEs are not shown in this area, although they may be reflected on the corresponding profile.
Zone 500IC (0.2% Annual Chance Flood Discharge Contained in Channel) An area where the 0.2% annual chance flooding is contained within the channel banks and the channel is too narrow to show to scale. An arbitrary channel width of 3 meters is shown.
Zone FWIC (Floodway Contained in Channel) An area where the floodway is contained within the channel banks and the channel is too narrow to show to scale. An arbitrary channel width of 3 meters is shown. BFEs are not shown in this area, although they may be reflected on the corresponding profile.
Zone FPQ (Flood Prone Area) An area designated as a "Flood Prone Area" on a map prepared by USGS and the Federal Insurance Administration. This area has been delineated based on available information on past floods. This is an area inundated by 1% annual chance flooding for which no BFEs have been determined.
UNDES (Area of Undesignated
Flood Hazard)
A body of open water, such as a pond, lake, ocean, etc., located within a community's jurisdictional limits, that has no defined flood hazard.