We’re putting in 3 retaining walls for our sloping backyard. How do we decide on the best drainage option?
I would recommend you consult a landscape professional. Study up on youtube too! It will depend on your watershed and quantity of water. Here in Texas we put a rock base down, then perforated black pipe on the bottom that extends thru the wall. We then back fill the wall with small rock. Local building code may require something different. Good luck!
Licensed landscaper or engineer speciallizing in seismic / soil / load calculations, but this person should be involved with the project from the beginning, not as an afterthought.
General Engineering A licensees and C27s should be able to build this relatively easily .