Storm & Flood Damage Recovery in Greensboro, NC

On red clay that is the normal mechanism rather than a defect. Clay accepts very little, so rain runs across the surface almost immediately and concentrates wherever the ground directs it, which is often a crawl space vent or access. The remedy is upslope: a shallow swale or interception that carries the sheet past the building. Work done at the vent itself treats the water at the worst possible point.

A small channel draining a developed catchment does exactly that. Roofs and pavement shed water that used to soak in, so the flow arrives quickly and the channel has little room to spread, which raises the level sharply rather than widening the flood. It also drops fast. The practical consequence is that there is no useful warning, so protection has to be permanent rather than deployed on the day.

The framing rather than the ground, and specifically the bottom of the floor system. A crawl space can look dry on the dirt and still have joists and subfloor holding moisture from repeated wetting, which is what eventually shows up as a soft floor. Ask for meter readings on the wood, taken at several points, rather than an assessment of whether there is standing water today.