How much gravel for a french drain?

For a typical 12-inch-wide, 18-inch-deep trench, plan about 0.05 cubic yards of gravel per foot of drain.

What slope does a french drain need?

A french drain should slope at least 1% (about 1 inch per 8 feet) away from the area you're draining.

📁 theHomework.ca_□×

Gravel, pipe, and fabric for a french drain.

Planning a drainage project?

Tell us what you need and local pros will get in touch. Free, no obligation.

Drain length (ft)

Save your results to your home — free.Open the full tool →

Tired of calling around? Post your project once and let local pros come to you.

How much gravel for a french drain?: For a typical 12-inch-wide, 18-inch-deep trench, plan about 0.05 cubic yards of gravel per foot of drain.
What slope does a french drain need?: A french drain should slope at least 1% (about 1 inch per 8 feet) away from the area you're draining.