Austin’s ground and slopes can hold rainwater at the surface
Intense rain in Austin often lands on ground that has been baked dry and is slow to take water in. Clay-heavy soil holds runoff near the surface until it has a defined way out. In yards with shallower rocky ground, limited soil depth and hard layers below it create much the same result: rain does not simply soak down and disappear.
Uneven terrain changes where that water goes. Instead of spreading evenly through a yard, runoff collects at low points, alongside a slab, or against a retaining feature. The important part of a drainage assessment is finding the real collection area and following the downhill path water takes after a storm, rather than assuming the wettest spot is the source of the problem.
A useful drainage layout gives surface water a route from where it gathers to a proper discharge point. Depending on that path, the work may use surface inlets, piping, swales, or a combination that moves water away from the foundation. The outlet needs as much attention as the drain itself: sending water only a short distance can leave it in another low area or turn it back toward the building.