Wellpoint dewatering systems are one of the most cost-effective and widely used methods for managing groundwater in shallow excavations. Typically used for pipeline trench work, stormwater or sewage systems, and basement construction, they’re quick to install, easy to maintain and highly adaptable to different ground conditions.
Wellpoints are small-diameter wells, usually around 6m in length, installed in a line at 1 to 2 metre intervals along or around the excavation. These are connected to a common header pipe, which in turn is attached to a wellpoint pump that creates a vacuum. This vacuum draws water from the ground and lowers the groundwater level, typically achieving a drawdown of 2 to 4 metres, depending on ground conditions.
Wellpoint systems can be installed on one or both sides of an excavation, or in multiple stages to match excavation progress. For example, an initial stage might be installed and excavated, followed by a second stage of wellpoints to achieve further drawdown. Where deeper excavations require more than two stages, a deepwell system may offer a more practical and cost-effective solution.
WJ offers a range of wellpoint installation methods to suit different site conditions, including jetting, augering, and rotary drilling with a water flush.
WJ has delivered wellpoint dewatering systems on a wide range of projects across the region. Our experienced teams combine technical expertise with efficient design and project management to reduce costs and maintain site progress. Whether for linear pipeline works or complex basement builds, we tailor each wellpoint solution to deliver safe and stable working conditions.
