When project excavations encounter water-bearing soils, or groundwater, dewatering is typically essential. Often classified as a temporary works process, dewatering encompasses the design, implementation, and management of appropriate groundwater systems that ensure tasks are safely completed.

As experts in groundwater management and dewatering, ENV’s team of engineers collaborates with clients to pinpoint and comprehend groundwater-related risks tied to their projects.

We offer an all-inclusive groundwater consulting and construction dewatering service. Our main objective is to understand and manage groundwater-related risks and physically dewater excavations using our fleet of dewatering equipment and water treatment equipment.

  • Step 1: Planning

    • Installation of groundwater monitoring.
    • Setting up and managing groundwater logging devices to accurately determine the standing water level (SWL)
    • Collection, analysis, and interpretation of groundwater samples with our portable monitoring equipment or laboratory service to ascertain groundwater treatment requirements
    • Groundwater modelling and mapping to estimate flow rate and groundwater treatment requirements
  • Step 2: Approvals

    • Preparation of Dewatering Management Plans adhering to relevant standards and guidelines in both QLD and NSW
    • Compilation of Soil and Water Management Plans
    • Completion of Acid Sulfate Soils Investigations and Acid Sulfate Soils Management Plans
    • Preparation, submission, and management of the groundwater approvals, for example, with Council and WaterNSW
  • Step 3: Dewatering

    • Well point dewatering systems: Consists of closely spaced, small diameter water abstraction points (well points) connected to a manifold, which is then attached to an appropriately sized pump. These are common for trench dewatering, footing dewatering, and shallow basement dewatering in permeable soils
    • Deep well dewatering systems: Involves the installation of larger diameter wells, typically set at 1.5 – 2.0 times the excavation depth. Rarely used independently, ENV’s engineers coordinate with clients to determine on the optimal spacing between wells. This ensures the wells work together to reach drawdown targets in deeper excavations. These systems are typically chosen for deeper excavation dewatering
    • Sump dewatering and open pit dewatering systems: A method to remove accumulated water from the lowest point of an excavation, pit, or pond. This is frequent in civil construction, mining, and deep excavations with low soil permeability
  • Step 4: Monitoring and Reporting

    • Monitoring of the receiving environment’s water quality (environmental monitoring).
    • Compliance reporting and completion reports, as mandated by WaterNSW