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Dewatering Techniques for Construction

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Wellpoints

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Used to lower groundwater levels to stabilize the soil; consists of a network of small-diameter pipes.

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Vacuum Dewatering

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Applies a vacuum to the soil to enhance water removal, often in conjunction with other systems like wellpoints.

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Eductor Wells

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Use high-pressure water jets for dewatering, create a flow of groundwater towards the well for extraction.

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Deep Wells

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Similar to wellpoints but used for larger excavations and greater depths; utilizes submersible pumps.

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Electro-osmosis

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(For fine-grained soils) A technique utilizing electric current to move water to electrodes where it can be pumped out.

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Freezing Method

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Use of refrigeration to freeze the ground, creates a temporary impermeable barrier to water flow.

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Horizontal Wells

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Laid horizontally, these collect water in a lateral direction; more suited to certain site conditions.

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Open Sump Pumping

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Simplest method, using ditches and sumps within the excavation to collect and pump out water.

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