CIRIA C515 Groundwater Control - Design and Practice
Whenever an excavation is made below the water table, there is a risk that it will become unstable or flood unless measures are taken to control the groundwater in the surrounding soil (see Figure 1.2). Groundwater may be controlled by installing a
physical barrier to exclude groundwater from the excavation; or by pumping groundwater from speicially installed ~7ells in order to lower artificially the water table in the vicinity of the excavation; or by a combination of the two techniques. The use of a pumped well system, either alone or in combination with a physical barrier, will often be the most economical and convenient approach. The appropriate type of pumped well system to use depends primarily on the nature of the ground and the depth of the excavation.
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