3/1/2024 0 Comments Pool rain overflow![]() Where drainage is slower still, replace soil with 60 percent screened sand and 40 percent compost. If water sinks in half that fast, amend it with 40 percent compost. If your soil drains quickly (at least ½ inch per hour), it can just be loosened. The sides of the swale should flare so they extend out three to four times more than they are tall, and the first 8 inches of soil should drain well. Consult a landscape contractor or a civil engineer if you live near a bluff, have a septic tank nearby, or are on a slope that drops more than 1 foot over a horizontal distance of 20 feet.Ī swale should carry water to a place where it can be released safely, such as a garden bed with good drainage or a buried dry well allowing it to be absorbed on-site, rather than flow into a storm drain, is important for protecting natural waterways. You can build a small swale yourself, but for a long, wide one you’ll want to hire a pro with earth-moving equipment. Rugged prairie plants or other natives that are at home in fast-draining soil are another option. Along the sides, she uses evergreen ferns, sedges, winterberry, grasses, and Siberian and Louisiana irises that thrive in moist conditions. Jan Johnsen, a landscape designer in Mount Kisco, New York, often landscapes swales by lining them with river rock. The addition of a perforated pipe laid in gravel underneath can help handle heavy water flow.Ī small swale might carry gutter water from a house to a dry well, while a more substantial one could run along the base of a hill above a low-lying house to divert water around it. Plants on a swale’s gently sloping banks-and sometimes down the center of the channel itself-take up much of this water. They filter runoff along the way by allowing it to sink into the soil. Swales are depressions that follow the contour around the base of a slope (natural or created), channeling storm water from one place to another.
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