A perforated conduit such as a pipe, tubing, or tile installed beneath the ground
to intercept, collect, and convey excess ground water to a suitable stable
outlet provide an easy
channel for water to flow through. Water runs into a gravel-filled trench, then into
perforated pipe at the bottom of the trench. Water travels freely through the
pipe, which empties a safe distance from the building or de-watering with pump