Collect Standing Water at the Surface Before It Reaches Your Crawl Space

A surface drain, also called a catch basin or area drain, is a grated inlet set into the ground at a low point where water collects. It connects to buried pipe that carries the water to a discharge point away from the foundation, instead of letting it sit and soak into the soil.

A surface drain collects water that is already pooling on top of the ground, at a low spot, a patio edge, or below a downspout. A French drain works below ground, intercepting water moving through the soil before it reaches the foundation wall. Many crawl space drainage plans use both, since they address water at different points.

It addresses one source, standing surface water near the foundation, which is often a real contributor to crawl space moisture but rarely the only one. Epp Foundation Repair looks at surface drains alongside downspout extensions, grading, and, where the crawl space itself needs it, encapsulation and interior drainage.

The main upkeep is keeping the grate clear of leaves, grass clippings, and other debris, since a clogged inlet cannot take in water as fast as it arrives. Beyond that, a properly installed surface drain runs with little attention.

It routes through buried pipe to a discharge point clear of the foundation, either daylighting on a downslope or tying into an existing drainage line on the property. Epp Foundation Repair plans that route on site based on the yard's actual slope and layout.