How much gravel and pipe do I need for a French drain?
For a gravel-filled trench with perforated pipe wrapped in fabric.
Drain gravel
3.7 tons
Estimated material cost
Drain gravel
3.7 x $$45.00 per ton
$167
Perforated pipe
5 x $$15.00 per 10 ft piece
$75.00
Typical store prices before tax and delivery. Change any price to match your store.
How to measure
Measure the drain's length and decide the trench width and depth.
Tips from the field
- Slope the trench at least 1 inch for every 8 to 10 feet so water runs to the outlet.
- Use washed gravel, not crushed with fines. Fines clog the drain.
What you'll need
Common questions
How deep should a French drain be?
Usually 18 to 24 inches deep and about 12 inches wide.
What gravel goes in a French drain?
Washed, clean gravel about 3/4 to 1 1/2 inch, with no fines that can clog the pipe.
How much slope does a French drain need?
At least 1 inch for every 8 to 10 feet toward the outlet.
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