Ground Water control
Any excavation below groundwater requires dewatering input to control water levels and prevent the potentially catastrophic effects of water ingress which can include instability, heave or quick conditions. Dewatering normally involves the temporary lowering of the groundwater level within an aquifer or depressurising the artesian head. In some instances a permanent solution is required and a continuing groundwater control system is installed. Solutions include gravity drainage or deep wells, using submersible borehole pumps or applying a vacuum to a soil material using ejector systems or vacuum wellpoint systems.