An irrigation ditch or trench reduces and controls stormwater runoff flow by leveling a sloping channel into the grass. The surface can be grass, vegetation, or crushed stone. You can build a small swamp yourself, but you should hire a professional with earthmoving equipment to make it long and wide. Consult a landscape contractor or civil engineer if you live near a cliff, have a septic tank nearby, or are on a slope that descends more than 1 foot over a horizontal distance of 20 feet.
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