Dewatering Archives - Moretrench

Ash Pond Services

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Clean closure or rehabilitation of coal combustible storage (CCR) facilities can be significantly enhanced in terms of both safety and reduced project duration by the implementation of specialty dewatering, grouting and cut-off and containment techniques.   Moretrench offers a range of site-specific options to assist facility owners in meeting project requirements efficiently and effectively.  Learn more here.

Recharge

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Artificial recharge – the return of water to the ground – can be used to minimize the following potential side effects of excessive groundwater lowering during construction:

  •  Consolidation of compressible soils that can result in damage to existing structures
  • Deterioration of timber piles or other underground timber structures
  • Loss in capacity of water supply wells
  • Saltwater intrusion, movement of groundwater contamination, or migration of contaminant plumes

Recharge can be accomplished using modified deep wells, wellpoints, and recharge trenches.

Ejectors

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An ejector system is somewhat of a hybrid system between wellpoints and deep wells. Ejectors are typically used where the groundwater must be lowered more than 15 feet and the soil is of low hydraulic conductivity so that vacuum application is of benefit to improve soil drainage. Read more.

Wellpoints

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The wellpoint system is the oldest method of pre-drainage and has been in use for more than 90 years. The basic components are the wellpoints themselves, a shared wellpoint pump and associated header piping. Wellpoint systems have been installed requiring thousands of wellpoints and multiple pumping stations. Read more.

Deep Wells

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A deep well is, quite simply, a dewatering device equipped with its own submersible pump. Deep wells can vary from 3 to over 24 inches in diameter, be installed from 20 feet to hundreds of feet deep, and pump from a fraction to thousands of gallons per minute. Deep wells are best suited where permeable soil extends well below the bottom of the excavation. Read More.

Overview

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Construction dewatering, the temporary lowering of the groundwater, has been practiced by Moretrench for more than 90 years and the company is recognized as an industry leader and an innovator in the field. Methods include deep wells, wellpoints, and ejectors. Under some circumstances, artificial recharge can be used to minimize the potential side effects of excessive groundwater lowering during construction.

Groundwater control can also be provided by the installation of subsurface barrier walls or by ground modification methods. In addition to construction applications, groundwater control methods can be used for environmental containment and structural seepage control or for stabilization of waste products such as coal combustion residuals.