zone ae floodplain definition
Zone C, Zone X - Areas determined to be outside 500-year floodplain determined to be outside the. 1% and 0.2% annual chance floodplains. Zone B, Zone X500 - 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. An area inundated by 0.2% annual chance flooding. 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 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.