Wellpoint Dewatering

Wellpoint dewatering is the most effective method for lowering water levels in relatively shallow excavations up to 6.0m deep. They can be installed relatively easily to create a versatile system and can be easily maintained. These systems can be arranged in any formation to enable the excavation of localised shafts or a linear system can be installed to provide dewatering for long trenches.

This method comprises of a number of disposable small diameter wells being driven into the ground using high- pressure water jets. These wells can be driven around the perimeter of the works to below the depth of the excavation. Riser pipes are then placed into the wells and connected at the surface with a continuous header pipe which, in turn, is connected to a specialist high vacuum pump. Once the pump is turned on the water is pulled up from the wells in the immediate area of the excavation, leaving the working area stable. The water is then discharged or removed from site.