Wellpoint dewatering is essential for any major construction, mining or civil work project in need of reducing ground water levels. Without adequate water management (including during excavation, construction and maintenance), there is a high risk of creating an unsafe worksite and unstable foundations.

Here, we’ll look at everything you need to know about wellpoint dewatering systems and recommend our best pump for the task.

What Is Wellpoint Dewatering?

Wellpoint dewatering is the process of removing or controlling excess groundwater during excavations. It creates a safe and dry working environment for a wide variety of applications like pipeline construction, shallow foundations and trench works. It is particularly suited to shallow excavations or excavations taking place in fine-grained soils.

Without proper water table management, excavation and construction poses a risk to the structural integrity of the site. This can result in surface flooding, foundational instability, rising damp or erosion of the new build further down the line.

How Does Wellpointing Work?

A standard wellpoint dewatering system involves placing multiple wellpoints around an excavation site.

We install the wellpoints in the ground at a precise depth using a high-pressure jetting technique. They then connect to riser pipes that carry water from the ground to the surface.

The riser pipes connect to a main pipe using a flexbow. The main pipe then connects to a wellpoint dewatering pump, creating the suction force needed to extract water from the soil.

From here, the water flows out of the site to a designated point or collects in a tank for removal from the site.

The Difference Between Deep Well & Wellpoint Dewatering

Wellpoint dewatering relies on a vacuum to draw water out of an excavation pit. It's ideal for removing water from small to medium sized construction projects with shallow excavation pits.

Deep well dewatering, on the other hand, relies on a borehole with a slotted liner and an electric submersible pump. It is well-suited to sites that need to remove large volumes of groundwater and/or exceed the recommended depths of wellpoint systems (12-15m).

Impulse Dewatering Pump – Our Top Wellpoint Dewatering Pump

The Impulse Wellpoint Dewatering Pump is purpose-built for projects like pipeline construction and trench works on civil and construction sites. It is specially designed for draining and drying on work sites where there is limited groundwater.

The diesel powered reciprocated piston pump features an inbuilt telemetry system to guarantee simple control and readings at a glance. It also comes fitted with a noise minimising canopy to ensure it meets urban and residential noise restrictions.

Key features of the Wellpoint Dewatering Pump include:

• Cylinder diameter: 175mm
• Engine power: 7.5 kW
• Capacity: 90 m3/h
• Head: 22 mwc
• Vacuum 9.5 mtr

Our Wellpoint Dewatering Pumps In Action

DWS Dewatering came to Blue Diamond Machinery seeking a solution to manage groundwater levels during a long-term train line project in Western Australia.

As a solution, Blue Diamond Machinery supplied 30+ of our reliable, hassle-free Impulse mobile dewatering pumps. Throughout the project, the pumps ran 24 hours a day, effectively managing groundwater levels and keeping the project running smoothly.

See our case study here to find out more about the project.

Get The Right Advice, Contact Us Today

With years of experience, you can rely on Blue Diamond Machinery to provide the right advice and a wellpoint dewatering system to meet your unique requirements.

For more information on the best model to suit your water movement needs, contact us today or speak to one of our expert team on 1300 998 647.