Open Dewatering

Open dewatering systems offer an effective solution for lowering the groundwater table, especially in cohesive and low-permeable soils. These systems involve pumping water directly from sumps or ditches positioned along the slopes of excavation works. With a simple setup, a suction hose with a strainer is placed in the sump to collect water, which is then primed and discharged.

The open dewatering system is known for its ease of installation and operation. It utilizes self-priming or vacuum-assisted centrifugal pumps, such as the GEHO types VP and VRP.

Self-priming contractor pumps, like the GEHO type VP, are heavy-duty, single-stage centrifugal pumps with semi-open impellers. They are suitable for pumping contaminated water at capacities up to 850 m³/h against a head of 35 meters. These pumps find applications in open dewatering, general sump pumping, and irrigation.

Vacuum-assisted contractor pumps, such as the GEHO type VRP, are also heavy-duty centrifugal pumps equipped with air separators and vacuum priming pumps. The VRP series can pump heavily contaminated fluids of up to 4000 m³/h against a head of 40 meters, with a maximum particle size of 40 mm. These pumps are utilized in open dewatering, general sump pumping, and optionally in wellpoint dewatering applications.