One problem caused by flooding in your basement is the formation of mold and mildew on the walls, floor and any items in the space. Mole and mildew is a major health issue that can lead to respiratory problems including asthma, coughing, sneezing, wheezing, nose and throat irritation, nasal congestion and other breathing difficulties.
Flooding in a basement can damage the building's foundation, any openings leading in/out of the basement, and any equipment in the basement, like a furnace or laundry units, as well as any furnishings you may have in the space. Any damaged equipment and structures will have to be removed and cleaned or replaced.
Flooding also gives rise to musty smells and other odors. Even after drying out the furnishings and replacing equipment, musty smells may still be present. Smells can linger, especially if the walls or insulation inside of the walls were flooded.
High humidity and surface condensation is yet another problem related to flooding in your basement. It may cause the deterioration of floor joists, beams, and sub-flooring, as well as damage electrical lines running to the floors above the basement. Floors above the basement can eventually give away and have to be replaced. Also, humidity and condensation can cause warping of doors and cabinets as well as cause an increase in monthly heating and air conditioning costs.
Remove as much water as possible from the flooded basement. Contact your local equipment supply store or home improvement center to rent a sump pump to remove the flood water. Any furnishings, walls and equipment damaged by the water will have to be removed also. To prevent future flooding, seal any holes and cracks present in the basement walls/foundation and repair any pipes or equipment leaking water. Research basement waterproofing methods and put them in place also. Outside of your house, install new gutters and gutter extensions to keep water away from your house. Repair any soil or water pooling problems around the house.