My stone foundation house has water issues in the basement, my house sits about 20 feet off of a elevated railway which means a steep slope towards my house. I thought I had graded it well enough but I still have rainwater getting in. I considered doing a swale at the base of the hill sloping towards a side yard, or doing a exterior "trench drain" with perforated pvc inside. Concerned the trench drain would clog though but with the swale its only getting surface water, how much is beneath the surface that will make it to my basement wall ?
Pic is included.
