Dewatering system design

The purpose of a dewatering system is to manage groundwater to enable excavation and construction to take place in safe conditions, without failure of the ground or failure of the structure being built. Design of an optimal dewatering system can be accomplished by coupling the techniques of operations research to a ground-water flow model. Operations research is a quantitative and systematic approach that mathematically formulates an optimization problem in terms of an objective function and a set of constraints.

Dewatering involves controlling groundwater by pumping, to locally lower groundwater levels in the vicinity of the excavation. Groundwater Engineering’s team has decades of experience in dewatering projects around the worl and we provide a complete design and installation service to control your groundwater problems.

Dewatering Systems Design Dewatering systems are used for a variety of applications in Florida. A couple of common uses are to support underground construction or to recover contaminated groundwater for environmental remediation. MATHEMATICAL AND MODEL ANALYSES. Design of a dewatering system requires the determination of the number, size, spacing, and penetration of wells or wellpoints and the rate at which water must be removed from the pervious strata to achieve the required groundwater lowering or pressure relief.

Dewatering and construction dewatering are terms used to describe the action of removing groundwater or surface water from a construction site. Normally the dewatering process is done by pumping or evaporation and is usually done before excavation for footings or to lower water table. It is very important to determine early the distance, the drawdown and the time based on the pumping tests carried out.

The wells, or “wellpoints,” are then connected to a headerpipe and pumped by wellpoint pumps that can handle both water and air. Eductor System This system also known as the ‘jet eductor system’ or ‘ejector system’ or ‘eductor wellpoint system’ is similar to the wellpoint system. We manufacture equipment and install dewatering systems for the most complex groundwater challenges in the construction industry. From engineering design to system installation to filtration and treatment of discharge water, we have the expertise and equipment to keep your excavation safe, dry and on schedule.

How does a dewatering system work? What is dewatering, when is it use and methods? Complete Replacements or Temporary Dewatering Solutions. Dewatering design is the process of developing a workable and economic solution to a groundwater problem that will affect an excavation. In some cases design starts with a clearly defined and understood groundwater problem, and the main design objective is to develop an appropriate solution.

A deep well system or a jet-eductor well point system is a best choice for dewatering that requires penetration into a field pervious soil or rock. These are mostly implemented for the construction of deep shafts or tunnels or caissons. Our most versatile pre-drainage solution. Ejector (or eductor) dewatering systems are used to control pore pressures and to lower groundwater levels to provide stable working conditions in excavations.

Ejector systems are able to extract groundwater and generate vacuum at the tip of wells and can be installed to depths in excess of 50-feet. During system installation, you may encounter conditions that will force you to change your engineering designs.

Then there’s the question of what to do with the water you remove. The presence of natural or man-made contaminants, such as arsenic or toxic metals, may demand a discharge treatment solution to comply with federal, state, and local statutory requirements. A well-point dewatering system consists of a series of closely placed small-diameter wells installed to shallow depths. These wells are connected to a pipe or header that surrounds the excavation and is attached to a vacuum pump. The construction steps in the wellpoint system are: 1. Dewatering systems are routinely used in the construction industry to provide temporary reductions in ground water levels for structures which extend to below groundwater level.

Groundwater control extends this definition to encompass any pumping or recharge system used to manipulate groundwater levels for a range of purposes.