This is a photo is of drain tile running along a concrete foundation in a benched footing excavation. Drain tile is used for re-routing water that has fallen close to the foundation. The drain tile is semi-permeable and allows water to enter without other particles following suit. In this picture, an L-connector is used to connect the two pieces at the foundation corner. The drain tile runs the perimeter of the house and then exits the yard in the lowest corner. In order for the tile to be hidden, a trench is dug to conceal the tile. This allows for gravity to cary the water from a high to low point.
Once the drain tile is laid, crush-n-run stone is dumped on top of the tile, normally 4" depth. This helps to act as another permeable shield to keep out larger particles and allow only water to fall down.
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