Groundwater control or dewatering is the temporary reduction of pore pressures or groundwater levels. It converts saturated ground into a dry, stable and safe condition. It is used to allow the construction of the deep excavations that are required for buildings, tunnels and other underground structures. WJ designs, installs and operates the deepwell systems, ejector systems or wellpoint systems that provide groundwater control. In addition recharge systems can be deployed to protect structures and environmentally sensitive areas that may be adversely affected by off-site drawdowns. The choice of system depends on ground conditions, as shown in the Roberts diagram. Ground conditions are assessed by the analysis of site investigation information, which may be supported by specialist pumping tests.
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