Interior drainage
Interior perimeter drain tile is installed near the footing below the slab. It collects water and commonly routes it to a sump crock.
Exterior drainage
Exterior footing drainage is designed to move water away from the foundation. Its usefulness depends on condition, outlet or sump connection, surrounding soil, and how water is managed at the surface.
Sump and discharge
A sump pump removes collected water. The discharge route matters because sending water back toward the foundation can undermine the purpose of the system.