Well Point Dewatering Systems

 Well Point Dewatering Systems are essentially shallow wells which offer an economical and effective method of groundwater control for site dewatering.

Well points have the advantage of being able to be installed in most ground conditions as well as being easy to maintain. They are particularly suited to control of groundwater levels for shallow foundations and trench works in water-bearing granular soils.

When installed at close spacing at appropriate depths this will lead to satisfactory dewatering and ground stabilisation in stratified and fine graded soils, allowing for safe excavation of the working area on site.

They are effective for excavations up to four metres deep for a single stage system. For greater depths, if space permits, multi-stage systems can be installed to achieve even greater draw down.

Well points are installed using conventional jetting methods, which involve pumping water at high pressure supplied by a jetting pump. If self-jetting wellpoints are used, high pressure water is pumped directly down the riser.

Once installed, individual wellpoints are coupled by flexible swings to a horizontal vacuum header (collection) main. In turn, the header main is connected to a 200mm centrifugal or piston vacuum pump.

• Optimum performance
• High functionality
• Low maintenance

• They are available in capacities: 50-200 ltrs per second
• Well point systems are frequently the logical and economic choice for dewatering construction sites where the required lowering of ground water level is on the order of 15 feet or less
• The 15-foot lift restriction results from the fact that the water is lifted by difference between ambient air pressure and the lowered pressure created by the pump