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100-year flood

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A one-hundred year flood is calculated to be the maximum level of flood water to be expected in an average one hundred-year period. Sometimes, a 500-year flood is also calculated. Based on the expected water level, an expected area of inundation may be mapped out according to elevation above sea level. This area figures very importantly in building permits, environmental regulations, and flood insurance.

Also see topographic map, extreme weather.

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