While a French drain can help to redirect water away from your home's foundation, it is not a substitute for a sump pump. They provide a secondary level of protection to ensure water is actively removed. A French drain can help to reduce the amount of water that the sump pump has to remove, which can extend the lifespan of the pump. , but it's not a foolproof solution.. If you live in an area with a high water table or your basement is prone to flooding, it's best to have both a French drain and a sump pump to provide the best protection..