Dewatering is the method of eliminating groundwater and surface water from a job site. Usually, this method is carried out before excavation, or the groundwater level is lowered on site. Some techniques used are Deep Wells, Vacuum Wellpoints, and Eductor Wells. Water Treatment is also used in many groundwater treatment plans along with the use of our Sonic Drill Sampling and Sonic Drill Drilling.
Objective of Dewatering
There are two important targets of dewatering. The first is to stop excavations beneath the groundwater level from being submerged via groundwater. The second objective of dewatering is to avoid excavation instability caused by groundwater through controlling the pore water pressure and the tremendous stress around the excavation.
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…
An Artesian Wells is a well where water rises under pressure, naturally. Groundwater in some aquifers is confined between an upper and lower impermeable soil layer but the aquifer recharge source is located at a higher elevation which pressurizes the…
What is Sonic Drilling? Sonic Drilling is well suited for a wide variety of applications. What sets this technique apart from conventional drilling techniques is the ability to easily adapt to a wide variety of soil and rock types with…
In many cases, dewatering operations generate groundwater that must be treated in order to properly discharge it. Solids, volatile organics, and other undesirable compounds are often removed during water treatment before discharge. The techniques and methods that Malcolm employs to…
Eductor well systems are most advantageous when dewatering deep excavations where the volume of water to be pumped is relatively small because of the low permeability of the aquifer. Like vacuum wellpoints, eductor wells are spaced 2 to 10 feet…
A Vacuum wellpoint system is a complete dewatering system that consists of a wellpoint pump, a vacuum header, and a number of wellpoint connected to the vacuum header. The wellpoint pump is used to apply a vacuum to a series…