A hole dug to a depth above the water table so that its bottom and sides are typically dry except when receiving fluid discharged from an industrial process. Is often filled with gravel or is reinforced with concrete blocks to form a chamber.

a bored, drilled, or driven shaft or hole whose depth is greater than its width and is designed and constructed specifically for the disposal of stormwater

a drum or tank in the ground, full of holes (and now bottom) that can accept your drains and then let them seep into the ground away from your foundation

a hole in the ground where water collects

a system of drain tiles covered with small stones and soil fill

Constructed identically to a cesspool and differs only in that the clarified effluent from a septic tank or the wastewater from a washing machine or other grey water may enter. Modern drywells are often precast perforated rings surrounded by crushed stone to increase the absorption area. Drywells can also be used to return storm water to the ground or to relocate basement drainage water to another location above the water table. Drywells are not commonly installed today because of laws requiring the bottom of a leaching system to be 4 feet above the seasonal high-water table.