Dewatering Pumps are used in the removal of water from solid material or soil. Construction dewatering, unwavering, or water control are common terms used to describe removal of groundwater or surface water from a riverbed, construction site, caisson, or mine shaft, by pumping. On a construction site, this dewatering may be implemented before excavation for foundations, shoring, swimming pools or cellar space to lower the water table. This frequently involves the use of submersible dewatering pumps, centrifugal trash pumps.