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How Big Of A Trench Drain Do I Need? [Solved]
The trench should be about 18 inches deep and 9 to 12 inches wide. French drains need to have a slope of at least 1 percent, so the force of gravity will work for you. This means that the drain should slope down a total of at least one inch for every 10 feet of pipe.
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How do I Install a French Drain? French Drain 101 - Everything You Need to Know!
How
