rain garden
Photo: The City of Maplewood, Minnesota
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Calculations and Design

Designing a rain garden to handle all of the runoff from a roof or driveway entails careful calculations. But you can also learn by experimenting: Build one, watch what happens after a storm, and then enlarge it as needed.

Locate a rain garden at least 10 feet from your house and at least four times that far from a septic system or steep slope.
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