Storm & Flood Damage Recovery in Doylestown, PA

On thin soil over rock, surface changes can matter more than they would elsewhere, because there is so little storage to absorb the difference. It is worth documenting during rain rather than describing afterward. That said, a good deal of the water here moves along the rock beneath the surface, so a change uphill can also be irrelevant. Establishing whether your water arrives as surface flow or below grade determines which conversation is worth having.

Usually yes, and the discharge is the hard part rather than the drain. On sloping ground a gravity drain to daylight is ideal, since it has no pump to fail. Where the lot is flat or the rock leaves nowhere lower to go, an interior perimeter drain to a sump is the practical alternative. What does not work is relying on backfill to drain on its own, because in a rock excavation there is nowhere for it to drain to.

That delay is characteristic of subsurface flow. Rain soaks through thin soil, reaches the rock, and then travels laterally along it, which takes time and can bring water from some distance away. Surface runoff arrives during the storm; rock-surface flow arrives after it. The timing is genuinely useful diagnostic information, and it points the remedy below grade rather than at the gutters.