Every home should have a pump in the catch basin to evacuate water from the French drain and keep it away from the foundation. The image shows a diagram illustrating the ideal installation for a French drain. On a daily basis, water should flow naturally by gravity to the sewers, while in the event of heavy rain, the pump supports this system. Additionally, if the municipal sewers back up, an emergency outlet allows the pump to evacuate water from the basin to the outside courtyard. As a last resort, it is even possible to add a backup battery to the pump to ensure that no water can ever enter your home.