The deep well system forms a large number of bored wells in the site area where the water is excavated by submersible pumps. Whenever the water is pumped out it creates a dry patch in the well making it level and creates a cone of depression or drawdown around itself.
There can be multiple wells which can lower the groundwater level over a wide area beneath an excavation. Since this method does not use a suction principle, large drawdowns can be achieved, limited only by the depth of the wells, and the hydrogeological conditions. Such systems are more powerful for a wider area with optimal numbers of wells and pumps.