Well point system
Well Point systems are employed primarily to lower groundwater levels around foundations to provide stable working conditions. A Well Point system consists of a closely spaced series of small-diameter shallow wells. The well points are connected to a common head remain in which a partial-vacuum is created. One high-efficiency vacuum dewatering pump typically operates 100m or more of well points. For draw downs in excess of 6m, further stages of well points are installed at successively lower levels as excavation proceeds.
Well points are particularly effective for where a relatively modest drawdown is required in a wide range of soils from gravel through to silty fine sand.
Rapid and cost-effective Well Point installation may be achieved in sandy soils by jetting using high-pressure water; drilling installation may be necessary in coarse or cohesive soils.