First post here on LawnSite (be gentle). Hopefully this is a really obvious (stupid) question. I'm building a dry-laid patio that will be bounded on two sides by the house and two other sides by a dry-laid retaining wall. Part of the wall is pre-existing (lighter grey) and will be extended as indicated (darker grey). The retaining wall intersects existing concrete steps. The patio surface will be flush with the top concrete step and the retaining wall cap. I'm looking for feedback on how to grade this patio for drainage. In the attached image I've indicated the elevation (in inches) relative to the top step. Based on my survey work this is at the same level as the existing retaining wall (within 1/2"). I plan to extend the existing wall on a level grade and slope the patio up towards the house by 4". This will create an 1/8" to 1/4" slope for drainage away from the house and flat patio at the wall cap. Does this look correct? I'm a little nervous about puddling in the lower right corner of the patio which will be quite flat. Anyone have experience with this sort of configuration? I could lower the existing wall by one block (5") but I think this just creates problems elsewhere.