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French drain depth: About 8 inches to 2 feet deep should be sufficient for many water-diverting projects, though related systems, such as those built around foundations and sub-ground living spaces, as well as the bases of retaining walls, may be deeper.
1 On average, depending on the type, the costs of a French drain can vary anywhere from as little as $10 to as much as $30 per foot. 2  Thealternativepress.com provides the following average prices of French Drain from A-1 Basement Solutions:ips to know: 1  The cost of French Drain is determined by linear feet round the boundary of the basement. 2  A shallow French drain is suitable in areas where surface water is always soggy or keeps rushing across it. 3  A shallow drain is usually two feet deep and 1.5 feet across.