What is a French drain?

A French drain consists of a sloped trench dug into problem areas of a yard, filled with gravel and typically a perforated plastic or corrugated pipe, then backfilled with soil. Water flows into the gravel layer, passes through the perforated pipe, and travels downslope or to a designated outlet, moving groundwater away from foundations, low spots, and landscaping.

In Austin, where clay soil dominates much of the landscape, French drains address a common challenge: poor water drainage that leads to standing water, soggy yards, and foundation concerns. The clay's density naturally resists water infiltration, so French drains become practical infrastructure to manage both surface runoff and subsurface moisture. Homeowners often install them around pool decks, basement walls, patios, or garden beds where water pooling causes problems.

The system works by gravity and the physics of water following the path of least resistance through gravel. Because Austin's terrain varies, proper slope design is critical. A landscape contractor experienced in drainage solutions can assess whether a French drain suits your site or whether alternatives like catch basins, swales, or sump systems would work better.