If it is not possible or practical to excavate around the exterior of the basement walls in order to control water leakage, an interior footing drain can be installed and connected to a drainage outlet or sump pump.
-An interior trench along the inside bottom of the footing must be excavated. Another interior trench, connecting to the drainage outlet or sump area, must also be excavated. Drain or weeping tiles should be laid. Holes must be drilled through the bottum of the foundation walls to relieve outside water pressure and lead that water to the interior drain. The trench and weepholes through the walls should be covered with gravel and topped with concrete.
-A specialty membrane, along the interior of foundation walls and connected to the new interior footing drain can also be installed, eliminating the need to drill holes through the foundation wall.