French Drain Installation

The strip of yard between your house and the neighbor's stays spongy for a week after every storm, the fence posts are rotting at the base, and now there is a damp line creeping up the slab edge. Grading will not save a spot like this, because the water is not on the surface anymore. It is in the ground, moving slowly, and intercepting it is a design problem before it is a digging problem.

What a real french drain is

Strip away the mystique and it is four parts working together: a trench cut with continuous fall toward an exit, a filter fabric envelope, washed gravel, and a perforated pipe that gives collected water an easy road out. Groundwater seeps through the fabric and gravel, enters the pipe, and gravity carries it to a discharge point away from the house.

Every part earns its place. The fabric keeps Blackland clay fines from packing the gravel solid. The fall keeps water moving instead of standing. The discharge gives it somewhere to go. Miss any one and you have bought a gravel trench with a pipe in it, which is what a discouraging share of local installs turn out to be.

Trench vs system: how to tell what you are buying

A real proposal reads like a design. It names the trench depth and width, the fabric, the gravel spec, the pipe type, the fall it will hold, the discharge point, and where cleanouts go. A trench dressed as a drain reads like a length and a price. If the crew cannot say where the water exits and how much fall the run carries, the water cannot say either, and it will sit in the pipe under your yard.

When subsurface drainage is warranted

Buy surface fixes first: grade, gutters, downspout extensions, swales. They are cheaper and they solve most lots. A french drain earns its price when water persists below the surface after the cheap layer is done: seepage at the slab edge days after rain, a side yard that never firms up, an uphill neighbor whose lot drains through yours, or planter beds against the house that hold water like a sponge.

On clay, the stakes are specifically structural. Chronic wet soil against one side of a slab swells and lifts that side while the rest of the house stays put, the differential movement that our expansive clay explainer walks through. The drain is foundation protection as much as landscaping.

What it costs

Published industry cost data for the Georgetown area puts typical residential systems between $2,500 and $8,000. Length sets the base; depth, discharge distance, rock, and obstacles like fences and roots move it from there. The french drain cost guide breaks the number into parts and prices the surface alternatives too.

One habit protects the investment: run a hose test with the installer on the final walkthrough and watch water leave the discharge end. A system proven on day one is a system you can hold to its promise later.