Eductor Dewatering Systems

eductor dewatering system

What is Eductor Dewatering?

The eductor dewatering method features a series of small diameter wells equipped with a nozzle /venturi (eductor body) that is run by an at-grade pumping station. Eductor wells are extremely low-maintenance and cost-effective as they require minimal tuning after the initial startup.

Eductors are frequently used in low permeability soils, generally pumping less than 200 GPM. This method is especially suited for deep excavations as they have no suction lift limits.

Eductor System Design

Eductor systems are a closed-loop pressurized setup that uses a high-pressure supply water stream and nozzle/venturi to create a localized low-pressure (vacuum) zone at the bottom of the well. The vacuum draws groundwater in through a foot-valve that joins the return stream and directs to a recirculation tank.

Excess water from the network (groundwater) overflows from the tank via a gravity discharge line, and a jet pump pulls water from the same tank to supply water for the system. This method is not limited by suction lift and can handle air without losing prime. However, it cannot handle large volumes of water.


Eductor System Installation

Advantages & Limitations