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Dewatering Techniques for Construction
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Wellpoints
Used to lower groundwater levels to stabilize the soil; consists of a network of small-diameter pipes.
Eductor Wells
Use high-pressure water jets for dewatering, create a flow of groundwater towards the well for extraction.
Open Sump Pumping
Simplest method, using ditches and sumps within the excavation to collect and pump out water.
Freezing Method
Use of refrigeration to freeze the ground, creates a temporary impermeable barrier to water flow.
Horizontal Wells
Laid horizontally, these collect water in a lateral direction; more suited to certain site conditions.
Vacuum Dewatering
Applies a vacuum to the soil to enhance water removal, often in conjunction with other systems like wellpoints.
Deep Wells
Similar to wellpoints but used for larger excavations and greater depths; utilizes submersible pumps.
Electro-osmosis
(For fine-grained soils) A technique utilizing electric current to move water to electrodes where it can be pumped out.
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