General INFORMATION about a leach field

 A standard drainfield (also known as a leach field, disposal field or a soil absorption system) is a series of trenches or a bed lined with gravel buried one to three feet below the ground surface. Perforated pipes or drain tiles run through the trenches to distribute the wastewater. The drainfield treats the wastewater by allowing it to slowly trickle from the pipes out onto the gravel and down through the soil. The gravel and soil act as biological filters.