Sample Landscape Plans: Backyard Trench Drain to Swale (non-permeable space)Download/View Files: Backyard-Trench-Drain-to-Swale-(non-permeable space)Languages:English ← Sample Landscape Plans: Backyard Swale, Berm and Dry Creek System → Sample Landscape Plans: Backyard Permeable Paving,Hardscape Reduction (shady exposure)