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ASCE Adds 500-Year Flood Protection to 7-22 Design Standard
In what the civil engineers gtroup termed "the most significant change" to the 7-22 standard's flood load provisions since the inception of ASCE 7. the new supplement ties flood hazard mitigation to a
structure’s risk level, and sets the hazard area for most risk
categories to the 500-year floodplain for determining flood loads.