Dewatering systems are used to lower the groundwater table adequately in cohesive and low permeable soils. In dewatering systems, water is pumped off from the sumps along the slopes of the excavation works, The open dewatering system consists of a number of wellpoints that are spaced along a trench or around an excavation site and all points are connected to a common header, The headers are usually attached to one or more pumps that perform the pumping operation.

The Filterwell system is a combination of an internal screened pipe and an external slotted jacket pipe with a granular uPVC filter medium located in the gap between the two, Granulepack is a normal screened pipe covered with a bonded uPVC granular filter medium. The structure of Gravelpack is similar to the Granulepack with the exception of the filter medium comprising of specialized fine-grained sand.