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How Much Gravel for a 10×14 French drain?

The answer

5.7 ton

For a 10×14 ft french drain at 12" depth, with 10% overage included. Estimated cost: $314 at US national average pricing.

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

How we calculated this

  1. 1. Area: 10 × 14 = 140 sq ft
  2. 2. Volume: 140 × (12/12) = 140 cubic feet
  3. 3. Convert + overage: Add 10% for waste → 5.7 ton
  4. 4. Cost: 5.7 × $55.00 ≈ $314

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