Groundwater Lowering for Construction and Civil Engineering Projects Throughout Sweden
With a Newly Developed and Easy-to-Install Wellpoint System
Vortec Solution provides professional groundwater lowering solutions for construction projects, excavations, pipeline works and infrastructure projects. Using a newly developed and easy-to-install Wellpoint system, we create dry and stable working conditions while minimizing risks to the surrounding ground and structures.
Vortec Solution provides efficient groundwater lowering using Wellpoint systems – a proven method for temporarily lowering the groundwater table during excavation and civil engineering works. A network of wellpoints connected to vacuum pumps creates controlled and stable dewatering of the work area. The method is flexible, quick to install and particularly well suited to permeable soils such as sand and gravel. With correct system design, dimensioning and continuous monitoring, we provide a safe, cost-effective and environmentally responsible solution that maintains stable working conditions throughout the project.
What Is Groundwater Lowering?
Groundwater lowering, also known as groundwater dewatering, involves temporarily or permanently lowering the groundwater table to enable construction, excavation or other groundworks to be carried out safely. By controlling the groundwater level, stable working conditions can be maintained while reducing the risk of water ingress, hydraulic uplift and ground settlement. Groundwater lowering is used in projects ranging from water and wastewater infrastructure works to major construction, infrastructure and industrial projects.
When Is Groundwater Lowering Required?
Groundwater lowering is often necessary when the groundwater table is above the planned excavation level.
Typical Applications Include:
Deep excavations
Basement construction
Pipeline works
Pump stations
Bridge and tunnel projects
Industrial foundations
Infrastructure projects
Wastewater treatment plants and water facilities
Common Problems Without Groundwater Lowering
Flooded excavations
Unstable excavation walls
Project delays
Increased construction costs
Hydraulic uplift
Risk of ground settlement
Groundwater Lowering Methods
Wellpoint Systems
Wellpoint systems are an efficient method of groundwater lowering in sandy and permeable soils. The system consists of multiple wellpoints connected to vacuum pumps, creating a localized lowering of the groundwater table. This method is commonly used for excavations involving pipelines, foundations and buildings.
Deep Wells / Filter Wells
Filter wells are used when larger volumes of groundwater need to be handled or when excavations extend to greater depths. The wells are installed around the work area and pump groundwater away in a controlled manner.
Open Sump Pumping
For less complex projects, groundwater can be collected in sumps within the excavation and removed using drainage pumps.
Groundwater Recharge
Where the surrounding area is particularly sensitive, groundwater recharge systems can be installed to return extracted water to the ground. This helps maintain groundwater levels outside the excavation area and reduces the risk of settlement and other impacts on surrounding structures.
How Is Groundwater Lowering Carried Out?
Site Assessment and Geotechnical Analysis
We analyze the ground conditions, soil layers, groundwater levels and surrounding buildings and structures. Understanding the conditions of the site is essential for selecting and designing the correct dewatering solution.
System Design
The appropriate method is selected based on factors including:
Soil type
Excavation depth
Groundwater flow
Impact on the surrounding environment
The system is then designed and dimensioned according to the specific conditions and requirements of the project.
Installation
Wellpoints, filter wells or open sump pumping systems are installed according to the selected method. The system is tested before full operation begins to ensure that the required groundwater level can be maintained.
Operation and Monitoring
Groundwater levels are continuously measured and monitored to maintain stable and controlled operating conditions. Continuous monitoring also allows changes to be detected at an early stage so that the system can be adjusted when necessary.
Decommissioning
Once the construction or civil engineering work has been completed, the dewatering system is gradually taken out of operation. Groundwater conditions are then allowed to return to their natural levels in a controlled manner.
Risks Associated with Groundwater Lowering
Incorrectly designed or managed groundwater lowering can have a negative impact on the surrounding environment.
Risks That Need to Be Managed Include:
Ground settlement
Impact on nearby buildings and structures
Impact on private wells
Changes in groundwater flows
Environmental impact
For this reason, continuous monitoring and measurement are important parts of every groundwater lowering project. Correct planning, system design and monitoring help ensure that the required groundwater level is achieved without unnecessarily affecting the surrounding area.
Frequently Asked Questions About Groundwater Lowering
How long does groundwater lowering normally continue?
It depends on the scope and duration of the construction project. A groundwater lowering system may be required for anything from a few days to several months.
What is the difference between a Wellpoint system and filter wells?
Wellpoint systems are primarily used in permeable soils and for relatively shallow excavations. Filter wells are generally more suitable for deeper excavations or projects where larger groundwater flows need to be handled.
Can groundwater lowering cause ground settlement?
Yes. If groundwater lowering is not correctly designed and monitored, changes in groundwater levels can cause settlement and potentially affect surrounding buildings and structures. This is why careful planning and continuous monitoring are essential.
Is a permit required for groundwater lowering?
In many cases, groundwater lowering may require notification or a permit because the activity can be classified as a water operation under applicable environmental legislation. The requirements depend on the scope, location and potential environmental impact of the project.
Can Vortec Solution assist with system design and planning?
Yes. Vortec Solution provides complete groundwater lowering solutions covering planning and system design, installation, operation, monitoring and decommissioning.