[header] How to make a basement french drain [title] Plot out and mark the path of the french drain. [substeps] The drain should run about 1 foot (or 30 cm) away from the basement's exterior wall. Place it in the area with the greatest moisture. 
It should run to a collection basin in the basement (ideally placed in a corner), from which a sump pump will expel the water to the outside. [title] Dig out the floor of your basement along the path of the drain.