 This is Ken Helivang, NDSU Extension Agricultural Engineer. When returning to a flooded building, be sure that it is structurally sound, the electricity is off, and the building is free of natural gas and hazardous chemicals. If the basement is flooded, pump out only two to three feet of water each day or the basement walls may collapse. Contact your NDSU Extension County office or search the web for NDSU Extension Flood Info for more resources.