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How Much Gravel for a 10×20 French drain?

The answer

8.15 ton

For a 10×20 ft french drain at 12" depth, with 10% overage included. Estimated cost: $448 at US national average pricing.

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With 10% overage
Or in 0.5 cu ft bag
Estimated cost (US avg)

How we calculated this

  1. 1. Area: 10 × 20 = 200 sq ft
  2. 2. Volume: 200 × (12/12) = 200 cubic feet
  3. 3. Convert + overage: Add 10% for waste → 8.15 ton
  4. 4. Cost: 8.15 × $55.00 ≈ $448

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