![]() ![]() Upland areas and the areas formerly known as Zone X500 is the area described above with the 0.2% chance of flooding. *There are two zones marked Zone X on the current FEMA maps. The other Zone X* areas are uplands or areas that have not been studied. The Federal Emergency Management Agency (FEMA) recently developed Preliminary Flood Insurance Rate Maps (FIRM) and Flood Insurance Study (FIS) reports for. Zone X* is defined as, “An area inundated by 0.2% chance flooding an area inundated by 1% annual chance of flooding with average depths of less than 1 foot or with drainage areas less than 1 square mile”. The 1 annual chance flood (also known as the 100-year flood) has a 1 in 100 probability of being equaled or exceeded in any given year. FEMA worked with the Massachusetts Flood Hazard Management Program Office and the Massachusetts Office of Coastal Zone Management to revise the LiMWA based on. ![]() Zone AE is defined as, “An area 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”. The “zone” polygon attribute classifies all of Newton into one of three areas: Zone AE, Zone X, and Zone X*. Features and Attributesįor full documentation visit FEMA online. This layer refers to legal areas defined by FEMA for flood insurance requirements and rates. Newton’s Floodplains layer shows actual floodplains as designated by city Engineers. The FEMA maps were compiled at a much smaller scale and therefore are considerably less accurate than Newton’s Floodplains data layer. These are the boundaries as they appear on FEMA’s Flood Insurance Rate Maps (FIRM). ![]() This layer shows the Federal Emergency Management Agency (FEMA) floodplain boundaries for Newton. ![]()
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