We have a 4 foot tall retaining wall constructed of stone. When it was put in, probably 50-75 years ago, the builder did not put in a drainage system. Later on down the line, someone tried to resurface it with a concrete-like product (looks like a half-hearted job though -- much is no longer there).
I'd like to get a drainage system in behind this wall but I don't want to dig down behind it if I can avoid it. I can't say as I can think of any other way to do it, but before I subject myself to THAT fun I thought I'd see if anyone else has any brilliant ideas.
Thanks......
James