Unplug Electrical Devices
Turn off the electricity to the basement at the circuit breaker. Electricity and water do not mix, so turning off the main switch is imperative. Unplug and remove any electrical devices such as lamps, televisions and radios.
Water can saturate and destroy cloth or wood furniture, so remove them as soon as possible. You need to remove all furnishings on the floor or those that the water can reach.
Remove the Water
The water needs to be removed as quickly as possible to keep it from destroying any carpet on the floor and reducing the chances of mold formation. Start removing water with a sump pump or a wet/dry vacuum.
Dry the Basement
After removing all the water you can with the sump pump and wet/dry vacuum, you need to remove the rest of the moisture. Running a dehumidifier and placing fans around the basement dries the air, removing water particles. The dehumidifier may need to run continuously for several days to adequately remove all moisture.
Stop the Water
Find out how the water has entered the basement, and correct the problem. Repair cracks in concrete, slope dirt away from the foundation, and place extensions on downspouts to keep water from pooling by basement walls.