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GAMBIT has gained the respect of our customers by applying all the right solutions to their groundwater problems on projects both large and small. The key to GAMBIT’s success has been the combination of engineering staff, field personnel and experience. The wide variety of dewatering and pumping problems encountered by its customers has provided Gambit an opportunity to develop the necessary equipment and experience to solve most water handling problems.

Sump pumping is the simplest dewatering technique, whereby groundwater is allowed to seep into the excavation, and is then collected in sumps and pumped away for disposal. In favorable ground conditions sump pumping can be a very effective and economic method to achieve modest drawdowns. The technique can work well in well-graded coarse soils (such as gravelly sands, sandy gravels and coarse gravels) or in hard fissured rock. However, in unfavorable ground conditions sump pumping can lead to major problems. Instability can occur in fine-grained soils such as silts and fine sands where fine particles are drawn out of the soil, resulting in ground movements and settlements. Disposal of the water from sump pumping can also create problems, because pumped water may have a high sediment load, which can cause environmental problems at the disposal point.

WellPoint dewatering is widely used for excavations of shallow depths, especially for pipeline trench excavations. WellPoint are typically installed in lines or rings around the excavation. In appropriate ground conditions a well point system can be installed speedily and made operational rapidly. A typical WellPoint system consists of a series of small diameters wells (known as WellPoint) connected via a header pipe, to the suction side of a suitable well point pump. The pump creates a vacuum in the header pipe, drawing water up out of the ground. Multiple lines of well points in different stages/levels are required for the more deeper excavations

A deep well system consists of an array of bored wells pumped by submersible pumps. Pumping from each well lowers the groundwater level and creates a cone of depression or drawdown around itself. Several wells acting in combination can lower groundwater level over a wide area beneath an excavation. Because the technique does not operate on a suction principle, large drawdowns can be achieved, limited only by the depth of the wells, and the hydrogeological conditions.

These Systems are more powerful for a wider area with less numbers of wells and pumps.