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Swales, shallow ditches across a
slope, can divert water running downslope toward a foundation and also
help check erosion. Locate swales at the top and bottom of a slope,
making them 6-10 inches wide and about 6 inches deep. Mark them out by
pouring a line of sand along one edge, making sure to maintain a
downward pitch in the direction you want the water to go. Mound up
the earth you excavate on the downhill side of each swale. You can plant
the swales with grass or other groundcover, or fill them with gravel.
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