Zone AE and A1-A30 corresponds to 100-year, or 1% annual chance, floodplain that is determined in the Flood Insurance Study by detailed methods. Detailed hydraulic analysis is not performed for such areas, and no Base Flood Elevation (BFE) or depth is shown for this zone. Zone A corresponds to the 100-year, or 1% annual chance, floodplain determined by approximate methods. Areas subject to inundation by the 500-year flood (0.2%-annual-chance flood).Base Flood Elevations (BFEs) or depths (BFE is the calculated elevation of the 100-year flood).Special Flood Hazard Areas (SFHA) identified on the FIRM as zones A, AE, AH, AO, AR, V, VE or A99.Major highways, secondary roads, lakes, railroads, streams and other waterways.The 100-year flood is not a flood event that happens once in a hundred years, rather a flood event that has a 1% chance of occurring every year. It is more precisely defined as the floodplain associated with a flood that has a 1% annual chance of being equaled or exceeded in any given year. The hazard area or, Special Flood Hazard Area (SFHA), shown on the flood map is known as the 100-year floodplain. Preliminary Map Changes Viewer - The Preliminary Map Changes viewer allows users to view changes and differences between the current effective and preliminary FIRMs and create a printable report.Users can also create a FIRMette from the NFHL. All counties that have been digitized can be viewed on this site by entering an address into the search bar.
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