French Drain Calculator — Free Online Tool
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French Drain Calculator

Calculate gravel volume, filter fabric, and perforated pipe for French drains

Drainage Standard: French drains require a gravel-filled trench wrapped in geotextile filter fabric with a perforated pipe at the base. Standard aggregate weighs ~1.35 tons per cubic yard.
Trench Dimensions & Parameters

Calculation Results

⚠️ Ensure proper downward slope (at least 1% grade or 1 inch per 8 feet) towards the discharge outlet to prevent standing water inside the trench pipe.

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