Which of the following equipment is essential for the well-point system?

Explanation:

Centrifugal pump

A well-point system is a widely used dewatering technique to lower the groundwater table during excavation. It is especially effective in permeable soils like sandy or gravelly strata.

• The system consists of multiple well points (small-diameter tubes with strainers at the bottom) installed at close intervals along the excavation.

• These well points are connected through a header pipe to a vacuum pump—typically a centrifugal pump equipped with a priming tank.

• When the pump operates, it creates a vacuum that draws water through the well points, lowering the groundwater level around the excavation site.

Additional Information

Reciprocating Pump:

• Operates in a pulsating manner, not suitable for high-flow, continuous applications.

• Higher maintenance and lower efficiency in such scenarios.

Jet Pump:

• Often used in deep wells where high lift is needed.

• Not typically used in the well-point system due to lower efficiency and complexity.

Sump Pump:

• Used to remove water that has already accumulated in a pit (sump).

• Not effective for drawing groundwater over a large area like a well-point system requires.