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While this is often called a 100-year flood, this does not mean a flood only happens once every century. Instead, the term describes a flood event that has a 1% probability of occurring or being exceeded in any single year.3
Base Flood Elevations (BFEs) are established for properties within Flood Zone AE.4 A BFE is the regulatory water surface height that floodwaters are modeled to reach during a flood event that has a 1% annual chance of occurring.5 This elevation serves as a benchmark for local officials to set requirements for building elevation and flood-proofing, which directly influences the cost of flood insurance premiums.