To construct a cost-effective DIY French drain, dig a shallow trench sloping downward away from your problem area, line the trench with non-woven geotextile filter fabric to prevent dirt clogging, lay down a perforated PVC pipe or corrugated drain sleeve, fill the trench with clean washed gravel or crushed stone, and fold the excess fabric over the top before covering with turf or decorative rocks.
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