I took on a pretty big project last week. We have a general problem with drainage in the back yard when there is a big storm. It usually results in ponding at the patio and in front of it. I thought that it might help if I put in a drain tile that led from this area, sloped back to the alley. I started digging and was immediately confronted with my old nemesis. I totally forgot that the PO completely covered the back yard in layers of landscape fabric.