Clay over rock moves water sideways at crawl space depth. The drain intercepts it on the way.
Under Orchard Hill the clay sits on rock, so water soaking in reaches stone and then travels sideways through the top few feet of soil. That is the exact depth a crawl space occupies, which is why water arrives here with no visible path across the yard.
A drain works well against that, because the water is already moving laterally and only needs somewhere better to go. An interception run across the uphill side catches it in transit, and a perimeter drain at the house picks up whatever gets past.
Rural acreage makes the discharge easy. Where the land falls away we run it by gravity as far as needed, which means no pump and nothing to maintain beyond keeping the outlet clear. On open pier foundations we run the drain around the footprint at the drip line and usually discuss enclosing the perimeter alongside it.
Orchard Hill homeowners get the same scope every time, priced in writing before a crew books the date.

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