Successful lowering of ground water to the required depth requires selection of accurate technical solution (poorly informed selection of dewatering method can result in catastrophic failure of the system with costly consequences to the project). The most commonly used technique is well point dewatering that involves installation of well points into the ground and drawing the ground water to the collector pipe for removal by vacuum assisted self priming pumps. Bore well dewatering is another method by installing bored wells of sizes between 200-500 mm around the site and water drawn by submersible pumps. In this case, each well is equipped with its own pump and discharge system to remove the ground water. Other techniques include the use of sumps and drains with ground and excessive surface water removed by electric or diesel powered pumps.
