French Drains & Yard Drainage

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A yard that holds water after every storm isn't a landscaping problem — it's a drainage problem, and no amount of mulch, sod, or seed will fix it. We install French drains, channel drains, dry wells, and surface swales across the Greater Chattanooga area to move water away from foundations, basements, driveways, and outdoor living areas. The red clay soils common in Hamilton, Catoosa, and Walker counties don't drain quickly on their own; built right, a drainage system gives water a path that bypasses the soil entirely.

What a French drain actually is

A French drain is a gravel-filled trench with a perforated pipe at the bottom, wrapped in filter fabric, that captures groundwater and routes it to a discharge point. The trench acts like a slow-motion ditch underground — water seeps in through the gravel, falls into the pipe, and follows the pipe to a daylight outlet, dry well, or storm-line tie-in.

A good French drain has four parts working together:

1. A trench cut to a consistent fall (usually 1% minimum) 2. Washed gravel that lets water move freely through the soil into the trench 3. Perforated pipe at the bottom of the trench 4. A clear discharge point that doesn't backflow into the trench

Get any one wrong and the system silts in within a couple of seasons.

Common drainage projects we handle

• Foundation perimeter drains to keep groundwater off basement walls
• Footing drains tied into a sump pit and pump
• Yard French drains to capture and redirect surface and subsurface water
• Channel drains across driveways, garage aprons, and walkways
• Downspout extensions and dry wells to move roof water away from the house
• Swale construction for surface flow on sloped lots
• Catch basin and storm line tie-ins for harder cases

When you need a French drain vs. surface grading

Not every wet yard needs a buried pipe. If the water sits in low spots, regrading the surface might be the answer. If the water comes up through the soil after a heavy rain, or stays for days, a buried system is the right tool. We walk the site and let the soil tell us. The fastest indicator is mottled (gray-and-red) soil 12 inches down — that's a sign the area has been saturated long enough to change the soil chemistry.

How long French drains last

A properly designed French drain with filter fabric, washed gravel, and a clean discharge point should perform for 20-30 years. The failure modes are predictable:

• Sediment clogging the pipe — usually a sign the filter fabric was missed or installed wrong
• Roots invading at the discharge — happens when the daylight outlet is poorly placed
• Settled trench — happens when fines (silty soil) weren't kept out of the gravel

We use the right materials and protect them during construction so the system actually lasts.