The regulatory 100-year floodplain is an area mapped by the Federal Emergency Management Agency based upon the probability of that area flooding from stormwater on the order of once every 100 years. The Department of Planning & Zoning is a repository for FEMA's Flood Insurance Rate Maps (FIRMs) and offers assistance in making floodplain determinations and understanding flood insurance requirements. Land located within the 100 year floodplain has a 1% chance of being flooded in any given year, or 26% chance during the life of a mortgage, is subject to restrictive building regulations.
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