Like swales, French drains capture
water coming down a slope and send it elsewhere. To make a french drain
contour, cut swales about 12 inches deep across the slope, pour a 2-inch
bed of gravel, and install perforated plastic drainpipes. Use gravel
that is larger than the holes in the pipes. Cover the pipes with a layer
of gravel and filter cloth to prevent dirt from washing in, then fill in
with earth and cover with sod. Leave both ends of the drainpipe runs
open so you can flush them out with a hose should debris collect inside.
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