Hard, clay-heavy ground leaves rainwater with fewer places to go
After a dry stretch, clay-heavy soil hardens and sheds rain instead of taking it in quickly. When intense rain follows, runoff can remain on the surface around patios, side yards, low lawn areas, and foundations. In Blue Mound, a drainage system needs to account for that slow infiltration so water is directed away rather than left standing against the house.
A catch basin alone does not solve a drainage problem if the pipe has no workable fall or the outlet has nowhere free to discharge. The basin has to collect water at the low point, the pipe needs to carry it along a suitable route, and the discharge point has to keep water moving after it leaves the system. If one part of that path fails, water can back up or settle where it started.
The existing grade matters just as much as the drain. Ground that guides runoff toward a slab keeps soil wet along the foundation, while a drain installed below the surrounding grade can still fail when its outlet cannot drain freely. We consider grading alongside the drain layout and avoid sending runoff toward a fence line, another low spot, or a place where it can work its way back toward the structure.