Pumping water out of an excavation so construction work can be done in dry conditions.
The removal of groundwater, surface water, or accumulated rainwater from an excavation to maintain dry working conditions. Dewatering methods include open pumping (sump pumps), wellpoints, deep wells, and eductor systems, chosen based on soil conditions and the depth and extent of the excavation. Proper dewatering protects workers, prevents soil instability, and allows construction to proceed below the water table.
The contractor installed a wellpoint dewatering system along both sides of the deep trench to lower the water table during pipe installation.
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