I am mid-project in a DIY yard project. I have subbed out a large retaining wall to a civil / wall contractor. It's 220 feet long, between 2-5' in height, and makes 2 90-degree turns. It's built to code with CMU blocks and has an overkill of rebar in it and through the 26" wide and 14" deep footer. i'm in Southern California, so it's a dry climate. I plan to have the face of the wall stuccoed.
The wall just went up this weekend, but hasn't been filled with concrete, yet. That is coming this weekend. Before he comes back on Saturday morning I wanted to get a few things cleared up for my own knowledge and to know what to ask for to make this wall last. The wall has a lot of room behind it now, but will be backfilled with 12" of 3/4 gravel and then compacted and graded soil. No landscape fabric.
My contractor brought in 4″ corrugated pipe with holes on all sides to act as the drain tile at the base of the backside of the wall. I don’t see sock material. I was under the impression that you only wanted the holes on top of a strong PVC pipe so water could easily enter the pipe, but then the continuous bottom of the pipe could run the water out to drainage holes. My local building code does not specify anything other than 4" pipe.
Is it OK for him to use the pipe with holes on all sides or will the water just go in the pipe and run through it and sit below it?