Hi Jon, I have a driveway retaining wall that continues to be pushed by the ground, even though it is backed by gravel and drained to "nothing under the driveway" except crushed gravel. I realize proper drainage affects this somewhat, however would prefer not to cut open my driveway, sidewalk and dig all the way up to the French drain. Could it be an option to simply dig about 48" square and 45" deep and drop the drain from the bottom of the retaining wall there?. If in d...