Sandy ground with a shallow water table. The drain has to sit low enough to meet it.
The water table under south Houston County sits close to the surface, so an Elko crawl space can be within a couple of feet of standing groundwater during the wet months. That is what a drain here has to be designed around.
Sandy soil is a good medium for drainage. Water reaches a stone bed quickly and moves along it easily, so a properly set drain performs well. The catch is depth. The pipe has to sit below the level the water reaches, or it simply watches the crawl space flood above it.
We measure that level during the inspection and set the invert underneath it. The pipe gets wrapped and bedded in washed stone with filter fabric, and the run is carried to gravity discharge where the land falls away, or to a basin where it does not. On rural acreage the discharge can run far enough that the sandy soil does not bring it straight back.
Every Elko home gets the same crawl space french drain scope, and the written price says exactly what that covers.

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Thank you Trench Guys for repairing our foundation. John gave our home a thorough inspection and explained the process so we knew exactly what the problem was and our options. They worked hard and were friendly and knowledgeable.
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