Dewatering or construction dewatering refers to removing groundwater or surface water from a construction site. The dewatering process is done by pumping or evaporation, and is usually performed before excavation for footings or to lower water table that might be causing problems during excavations.
Dewatering from open excavation or trenches can be completed by several methods. The most common of all is gravity drain using drainage channels transporting away water from the area to be worked to the discharge point. Other ways for dewatering are by water pumping, siphoning and/or using large construction machinery buckets to scoop and dump water from an area.
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