So we found a lot of cracks along on our cement patio and a contractor told us that we had a slight negative grade so we could regrade away from the patio or try a french drain. I still don’t know if this was the way to go.
This was a weekend project by myself. I weigh 120 lbs so I had my work cut out. I think it was one day of pure digging before I had the energy to reconvene. Other sites will give you more technical advice. I’m just showing how I did mine.