Design and Construction - The design and construction of buildings in flood hazard areas, including flood hazard areas subject to high velocity wave action, should be designed and constructed in accordance with ASCE 7 and ASCE 24 and the following criteria: Where required by ASCE 24 to be built above the base elevations, floors and their lowest horizontal supporting members should not be less than the higher of:
• Design flood elevation
• Base flood elevation plus 3 feet (1 m)
• Advisory base flood elevation plus 3 feet (1 m) or
• 500-year flood if known
Additionally, levees and flood walls designed as protective works should not be considered as providing flood protection.
Federal Emergency Management Administration (FEMA)
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See the FEMA Flood Map Service Center