Install Sump Pump In Existing Basement: The addition of a sump pump to your home is a useful way to prevent flooding and water damage. If you're using the aforementioned battery-backup version, be sure the outlet is above your water line. Some types have a battery backup that can be a lifesaver during a power outage. Sump pumps are a common solution for wet basements. Be careful not to overtighten the fitting.