![]() ![]() The maps also delineate the 500-year floodplain (2% annual chance flood), as well as the floodway, which is defined as the channel of a stream plus any adjacent floodplain areas that must be kept free of encroachment so that the 1% annual chance flood can be carried without substantial increases in flood heights. FEMA also refers to the 100-year flood as the “base flood”, with the “base flood elevation” (BFE) defining the elevation to which flood waters will rise during the 100-year flood event. The SFHA is the area subject to flooding by the 1% annual chance flood (100-year flood) it is the area where the National Flood Insurance Policy’s (NFIP’s) floodplain management regulations must be enforced. These latest flood maps and flood insurance reports have an effective date of Jtherefore the maps that currently remain in effect are the Jflood maps until the July 2014 date. These are the official maps for the Town on Winchester on which FEMA has delineated the special flood hazard areas (SPHA) and other applicable risk zones. The latest Flood Insurance Rate Maps and Flood Insurance Reports are published to this web site below and can be downloaded for review or printing. However when the FEMA map does not state a flood elevation floodplain. Zone D D Out 9 An area of undetermined but possible flood hazards. This is an area to be protected from the 100-year flood by a Federal flood protection system under construction. Zone A99 A99 In 8 An area inundated by 100-year flooding, for which no BFEs have been determined. The Federal Emergency Management Agency (FEMA) is responsible for developing and issuing flood maps on a national level. These maps are available for viewing or copying in the Conservation Commission office. determined flood depths range from 1 to 3 feet. ![]()
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