Keto Strong First, the backyard will be designed with a low spot in the very center to collect and absorb rain water and snow melt. This depression may vary from several inches in a tiny garden, with regard to an excavated trough that's several feet outstanding. Second, rain gardens are usually located where they'll catch the runoff from impermeable surfaces like sidewalks and driveways, or from gutters and roof valleys. Third, rain gardens are usually planted with native wildflowers and grasses that will thrive in tough growing terms. Finally, rain gardens are designed to channel heavy rains various rain garden or distinct part of the garden.