Deep Wells

Dewatering solutions such as deep wells are often the most efficient and cost-effective depending on subsurface conditions. Deep wells are best drilled in soils with high permeability (sands and gravels) as well as in conditions where there are high pumping volumes or heads. It is often necessary to drill deep wells when working with coarse-grained sands, gravels, and cobbles. In the most challenging subsurface conditions, Malcolm has the expertise and equipment to install dewatering systems. Malcolm’s fleet of modern drill rigs and drilling tools allow us to install wells through sands, gravels, cobbles, boulders, and rock, as well as under artesian conditions (groundwater under hydrostatic pressure).

Malcolm’s fleet of modern drill rigs and drilling tools allow us to install wells through sands, gravels, cobbles, boulders, and rock, as well as under artesian conditions (groundwater under hydrostatic pressure). Deep wells can be equipped with electric submersible pumps (0.5–15 HP), which are typically connected via flex hoses to a common HDPE header piping that leads to the discharge location. These wells are typically installed outside the excavation; however, depending upon the shoring systems, these wells can also be installed and utilized on the inside of a cut-off shored system. Well spacing is dependent upon the subsurface conditions and the constructability, all of which are taken into consideration by the dewatering design and Malcolm’s field expertise.