Hölscher Solution_#05

RE INFIL TRA TION

When construction occurs below the groundwater level, it's often necessary to temporarily lower the water table by extracting groundwater. If this extracted water is discharged into surface waters or sewers, it's permanently removed from the natural groundwater cycle. Using our advanced technology, we return the extracted water back to where it belongs.

Back to the source

In times of climate change, groundwater resources are becoming increasingly scarce. To minimise the impact on groundwater bodies, we return as much water as possible to the source during every construction project – naturally purified. This helps preserve groundwater levels. Alongside conventional methods, we have been using our patented, continuously refined hw-dsi® process for over 10 years – a space-saving and gentle reinfiltration method, ideal for densely populated urban areas.

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Services

Conventional gravity infiltration

We provide standard reinfiltration methods such as gravity infiltration wells, infiltration trenches, or drainage systems. However, in densely populated areas, these technologies are often infeasible or cost-prohibitive due to space requirements. With the patented hw-dsi® process, we have perfected a particularly space-efficient and gentle reinfiltration method, minimising the impact on groundwater aquifer.

hw-dsi® exploratory drilling

The goal of exploratory drilling is to identify the horizon where the hw-dsi® level is located – a zone of increased hydraulic conductivity within the aquifer. Drilling is carried out as a rotary drilling process, typically with small diameters of 150 to 250 mm, depending on site conditions. A specially adapted small drilling rig is used for this purpose.

Innovative hw-dsi® infiltration

The patented hw-dsi® process minimises the impact on groundwater bodies. The nozzle suction infiltration system (DSI) enables faster, more efficient infiltration of seepage water into the ground using specialised drilling and measurement techniques. This process begins with exploratory drilling. Unlike conventional infiltration methods, the hw-dsi® process only requires well casing of DN50 to DN100.

Applications of the hw-dsi® process

Reinfiltrating extracted water helps prevent negative effects such as the drying of wetlands or subsidence of structures. The hw-dsi® process also results in a broader, shallower groundwater rise near the well. The following application areas are particularly well-suited for the hw-dsi® process:

100-%-Reinfiltration
Water treatment: In-situ groundwater remediation
Groundwater barriers
Groundwater recharge
Building and asset protection by means of permanent groundwater lowering
Reinfiltration of urban dewatering: Rainwater infiltration
Prevention of wetland and spring area drying

Hydraulic barrier with the hw-dsi® process

Changes in groundwater flow can lead to unexpected groundwater damage. The hw-dsi® process offers a cost-effective alternative to expensive containment structures. Creating a hydraulic barrier prevents the spread of contamination. The water required for infiltration can often be sourced entirely from construction dewatering, saving additional costs. The effectiveness of the barrier is monitored throughout the construction phase.

Water neutrality

Water neutrality means managing water use in a way that avoids negative impacts on natural water resources. We achieve this by reducing water consumption, improving efficiency, and offsetting unavoidable usage through measures such as rainwater harvesting or wastewater treatment. Our goal is to balance water extraction and reinfiltration, ensuring that the quantity and quality of natural water systems remain unaffected.

10 advantages of the hw-dsi® process

1

Return of large water volumes to the aquifer

2

Compatible with all forms of dewatering

3

Broader and shallower groundwater rise near the well

4

Reduced surface damage and less strain on urban areas

5

Land around wells becomes reusable after construction

6

Cost-effective due to small boreholes and compact drilling equipment

7

Highly energy-efficient – no pumps required (vacuum effect)

8

Significant reduction of discharged extraction volumes – up to 100% of the pumped water can be reinfiltrated

9

Elimination of water extraction and discharge fees

10

Simplified approval processes

Good reasons to choose Hölscher

Here are a few reasons why our customers enjoy working with us.

Continuous 24/7 water level monitoring for precise control

Water treatment and environmental protection to conserve water as a resource

Efficient automation of plant technology using PLC control and visualisation

Recording and tracking water levels, volumes, etc.

Real-time monitoring and data transmission

Water analysis and sustainable water treatment

Holistic approach

For the construction industry, municipalities, and industrial companies, we are the national and international partner of choice for demanding groundwater projects. Our company combines in-depth expertise, decades of experience, and technical excellence in groundwater management to provide safe, sustainable, and intelligently connected solutions in the areas of groundwater management, water treatment, well drilling, geothermal energy, reinfiltration and monitoring. We employ both proven methods and proprietary, patented procedures. Our services cover all necessary steps – from consultation and planning to developing customised solutions and professional implementation with computer-controlled monitoring and documentation.