Rain Garden Rain Garden Our demonstration Rain Garden was created with support and a challenge from the Erb Family Foundation. This is first Rain Garden that Piet Oudolf has designed. We feel privileged to have it in Oudolf Garden Detroit on our Belle Isle. Planting Designs Quick Facts Stormwater Practice Area3,803 square feetRetention Zone Equivalent Water Depth8.2 inchesRetention Zone Volume1,873 cubic feetTotal Area0.25 Acres Plant TypeVarietiesPlantsForbs201,078Grasses51,742Trees and Shrubs1589Total402,909* As of March, 2023 Plant List Other Rain Garden Resources Washtenaw County Water Resource Commission
