French drains engineered for caliche and flat ground — collecting trapped water and carrying it to a real outlet off your lot.
Tell us what your yard is doing and we’ll come take a look — no charge, no pressure.
A French drain is a gravel-filled trench with a perforated pipe that collects water in the ground and carries it away by gravity. It’s a proven tool — but in Lubbock it has to be built for caliche and flat ground, or it becomes the failed drain we get called to replace.
In open, sandy soil, a French drain can let some water soak away into the surrounding ground. Over Lubbock’s caliche that doesn’t happen — the hardpan won’t accept the water — so the drain has to function purely as a collector and conveyor: gather the water in gravel and pipe, and move all of it to a positive outlet off the lot. If there’s no outlet, a French drain here just fills up and sits, which is why the discharge is the most important design decision on the whole job.
| Element | What we do | Why it matters in Lubbock |
|---|---|---|
| Trench depth | 18 to 24 inches typical, adjusted to caliche | We dig to intercept the perched water; where caliche is shallow, we adapt rather than fight it. |
| Slope | Minimum 1% continuous fall | On flat ground you have to build the fall in; a level pipe holds water and silt. |
| Aggregate | Washed 3/4 to 1-1/2 inch stone, no fines | Keeps open pore space so water reaches the pipe fast. |
| Pipe | 4-inch perforated pipe | Rigid pipe resists crushing; sized for real storm bursts. |
| Filter fabric | Non-woven geotextile | Keeps fine soil from silting the gravel shut over time. |
| Outlet | Daylight, approved discharge, or sump | The make-or-break piece — water must leave the lot because the ground won’t take it. |
We line the trench with geotextile, set the perforated pipe on a gravel bed with real fall, surround it with washed stone, and fold the fabric over before capping. The fabric isn’t optional in fine soils — it’s what keeps the drain from silting shut in a few seasons.
On a genuinely flat lot, a French drain still needs somewhere to send the water, and if there’s no downhill, we pair it with a sump system. On lots that also collect surface water, we tie in catch basins. Part of the assessment is telling you honestly whether a French drain alone solves your problem or whether it’s one piece of a small system.
Trenching a French drain through hard caliche is slower and more physical than digging loam, and how deep the pan sits directly affects the work. On a lot where the hardpan is shallow, we may be cutting through rock-like material for much of the run — part of why we won’t quote a Lubbock drain without seeing it. It also shapes the design: if the caliche is shallow, there’s no point pretending water will soak below it, so the drain is built purely to collect and carry, and the outlet becomes the whole game.
In the fine, silty soils common here, we line the trench with non-woven geotextile and often add a sock on the pipe itself. That fabric is what keeps fine particles from migrating into the gravel and slowly choking the drain — the silting failure we see constantly on drains built without it. It’s a small material cost that decides whether the drain still works in five years or is packed solid.
Free on-site drainage assessments across Lubbock and the South Plains. We’ll tell you what’s actually causing the water — caliche, a flat lot, a nearby playa — and what it takes to fix it.