Drainage Trench

A channel which has been cut into the ground and is backfilled with gravel and often including a pipe. There are different types of drainage trench:
1. Those which drain land over a defined area and are often form part of a standard drain system such as herringbone or grid.
2. An interceptor drainage trench, or French drain, which is typically located at the bottom of slopes or field perimeters to prevent lateral surface and sub-surface water entering a particular area.