I have terraced planter beds with cinder block walls and footing. The wall heights are two feet. The inside width of each soil bed is 3 feet. The inside of the walls are waterproofed. On wall is 30 feet long, the other is 20. The beds will be irrigated with drip irrigation with occasional deep watering with hose, and plants will be a combination of vegetables, small fruit trees (maybe two or three at most), and flowering shrubs (two or three), and then perennials. I live in southern California. Soil is clayey here, but have modified it a slot with organics.
So, do I also need a french drain with outlet? If so, where should it be placed? For ex. above footing, below, how deep, how far, etc. Also outletting the french drain may be a problem because I don’t have a lot of slope in the rest of the yard. Thank you.
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