Dewatering is a term to describe the removal of groundwater or surface water from for example a construction site. In construction the water is pumped from wells or sumps to temporarily lower the groundwater levels, to allow excavation in dry and stable conditions below natural groundwater level.

The dewatering process in construction sites involves the removal of groundwater or surface water from the workplace. The process is usually carried out by pumping or through evaporation before excavating the ground for footing. It also helps to lower the water table for rapid excavation.