If weep holes are blocked with debris or silt, clean them out. Houses that have elevated floors should have all the perimeter vents opened to allow for as much cross-ventilation and movement of air in the crawl space as possible. This is necessary to dry out the floor joists and floor sheathing from the underside in an effort to minimize the amount of damage to the floor joists as well as the wood sub-floor throughout the structure. Ductwork systems also need to be flushed thoroughly and disinfected, since water that has filled the ductwork will deposit bacteria and germs that can introduce illnesses into the structure when the system is used. Water can collect in gas lines, causing the pilot light for appliances, heaters and water heaters to bum improperly, and in some cases go out.
Gas can escape if there is a faulty valve or thermal couple.
The gas system within the structure should be checked, and appliances checked for proper operation. Electrical systems should be thoroughly checked, especially if the water rose above the wall outlets. Silt can collect in these and cause short circuits. Also check all light switches and light fixtures for water if flood waters were high enough to reach them. Absolute precautions should be taken when checking the electrical systems and a professional should be called in if there is any concern or question regarding the condition or status of the electrical system.