Dewatering is associated with excavations where there is a need to work in dryer soils without being affected by the water table or moisture at a project site. A decision to perform dewatering at an excavation site is determined by the elevation of the bottom of an excavation, the height of the water table, the permeability and saturation of the soils, the degree of stabilization required along the edges of the excavation, and the duration and nature of the work being performed. The type of equipment and pumps selected for a dewatering effort are also determined by these factors.