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Dewatering is the process of removing groundwater or surface water from a construction site or underground mine. This is typically done to allow construction or excavation to proceed in dry conditions, preventing issues like instability, flooding, and operational difficulties. The methods used for dewatering vary depending on factors such as the volume of water, the soil type, and the depth of the excavation.

Common dewatering techniques include wellpoints, deep wells, and sumps. Wellpoints are small-diameter wells driven into the ground around the site, connected to a vacuum system that draws water out. Deep wells are larger diameter wells that pump water directly from aquifers. Sumps are excavation pits dug at the lowest point of a site to collect water, which is then pumped away. Ejector systems can also be employed, particularly in fine-grained soils where traditional wellpoints may be less effective.

The goal of dewatering is to lower the water table to a level that ensures a stable and workable environment. Careful planning and execution are crucial to avoid environmental impacts, such as settling of surrounding structures or depletion of local water sources. Dewatering systems are often monitored and adjusted throughout the construction process to maintain the desired water levels. Once construction is complete, the dewatering system is typically removed or deactivated.