The 100-year floodplain, defined by FEMA, is the elevation to which a flood has a 1% chance of reaching or exceeding in a given year. (It is not the level of the most significant flood within a 100-year period.) So-called 100-year floods can occur many ti

The 100-year floodplain, defined by FEMA, is the elevation to which a flood has a 1% chance of reaching or exceeding in a given year. (It is not the level of the most significant flood within a 100-year period.) So-called 100-year floods can occur many times within a 100-year period.

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The 100-year floodplain, defined by FEMA, is the elevation to which a flood has a 1% chance of reaching or exceeding in a given year. (It is not the level of the most significant flood within a 100-year period.) So-called 100-year floods can occur many ti