Ejector systems
Ejector systems
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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 a high vacuum at the base of wells up to 50 m deep and as little as 50 mm in diameter. Vacuum drainage can dramatically improve the stability of silty fine sands and laminated silts and clays by controlling excess pore pressures.
Supply pumps at ground level feed high-pressure water to the ejector nozzle and venturi located at the base of the wells. The flow of water through the nozzle generates a vacuum in the well and draws in groundwater.