FEMA will identify flood hazardous areas. Local building code will tell construction methods. Local zoning will adopt the FEMA standards. Electrical equipment below the flood zone will be in a wet location, and all equipment will have to be gasketed and watertight. What we usually do is to build the house on stilts, and keep all electrical equipment above the flood level. Any wiring below has to have a "W" in the insulation.
