Stormwater runoff on a sloped lot
On a lot that falls away from the street, a heavy summer storm sends water across the yard faster than the soil can take it. It pools against the uphill foundation wall, and if the grade right around the house tilts inward — which happens after years of settling and mulch — it reaches the wall instead of running past it.
That water doesn't announce itself. It comes in at a seam, a crack, or where a utility penetrates the foundation, and the first sign inside is often a damp patch at the base of a basement wall or water tracking across a slab toward a floor drain.
Basement flood cleanup