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Existing Construction

The purpose of this page is to define existing construction, a commonly used term in floodplain management.


For the purposes of determining flood insurance rates, structures for which the "start of construction" commenced before the effective date of the Flood Insurance Rate Map (FIRM) or before January 1, 1975, for FIRMs effective before that date. "Existing construction" may also be referred to as "existing structures."

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Last Updated: 
03/27/2018 - 09:35