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.