Construction Dewatering

For nearly 75 years, the name Moretrench has been synonymous with dewatering. In
1931, the company was founded as the first dewatering equipment manufacturer and then evolved into a dewatering contractor. Even today, the
specialty manufacturing ties are kept close - with fully-
outfitted fabrication shops that allow us to custom special
fixtures and any apparatus needed for specific projects.

The firm designs, builds, and operates dewatering
installations that facilitate safe construction. Soil type,
soil permeability, depth of excavation and structure size
are specific project factors that determine the best
dewatering solutions. Site access and client schedule are
also important issues considered. Wellpoints, ejectors and wells are the tools employed by Moretrench to achieve dry subsurface conditions.

Wellpoint systems use a series of small diameter wells connected
to a common suction manifold. Hundreds of wellpoints can be connected to
just one wellpoint pump. These types of systems work well in highly
variable soils and in shallow aquifers where the water is drawn down very
close to an impervious layer.
Ejectors use individual nozzle and venturi-type pumps powered by a
centrally located pumping station to draw groundwater from a series of
small diameter wells. Ejector systems eliminate vacuum lift limitations
associated with wellpoints. This factor makes ejector systems ideal for
fine-grained soils and on projects where substantial drawdown is
required.
Wells are a groundwater control system made up of a series suitably
screened and filtered collection devices, each equipped with its own
submersible pumping unit. Wells are a flexible dewatering option, as they
can be installed in depths as shallow as 25 feet, or go as deep as several
hundred feet. Wells are best implemented when soils to be dewatered are
permeable and the aquifer extends well below subgrade.