Wellpoint dewatering is commonly used when excavations are required to extend beyond the ground water table especially in the construction industry.
Spears (well points) are embedded into the ground around the excavation site on the ground level and connected to a header pipe. The header is then connected to a pump. These spears draw water from the perimeter of the area to be excavated thus lowering the water table and allowing excavations and construction to proceed.
The resultant water is then discharged off site in accordance with any environmental management system (EMS) that exists.