As a leading dewatering subcontractor, monitoring is at the heart of everything we do, whether it be for the control of a dewatering system, the instrumentation of a high quality pumping test or for compliance with Environment Agency abstraction licence and discharge consent conditions.


Our monitoring and control systems typically consist of:

  • A central data logger or PLC unit with remote GPRS/GSM modem connection
  • Water level monitoring by transducers (wired or wireless)
  • Flow meters, including electromagnetic, mechanical (with pulse output) and ultrasonic types
  • In-line water quality sensors, such as pH, electrical conductivity and turbidity
  • Pump function alarms and a remote or automated facility to switch-on/off
  • Solenoid valve controls for automated process control


More challenging and ambitious construction projects can require a greater level of care in terms of control and monitoring to ensure that performance criteria are met, water levels and flows are regulated, and abstraction, discharge rates and quality is kept within permissible limits. One of the biggest advancements in this area is the use of automated remote monitoring systems, often referred to as SCADA (Supervisory Control and Data Acquisition). In addition to allowing continuous reporting of the current status of dewatering systems, certain plants and equipment can be controlled remotely via SCADA; either automatically in response to input measurements or manually by personnel located off-site. This may include ramping up and down of pump speeds to maintain a certain drawdown level, opening and closing of motorised valves to direct water to different wells during a reinfiltration scheme, or activation of certain water treatment processes in response to the changing water quality received at a treatment plant.


The SCADA Monitoring System in Action

The SCADA Monitoring System in Action


Designing and operating a SCADA system requires specialist knowledge in the wiring and programming of a PLC (Programmable Logic Controller), an appreciation of both the mechanical and electrical aspects of the plant, and in-depth experience in the particular groundwater management processes involved. In addition to requiring extensive specialised experience to design and operate, SCADA systems face many other challenges, such as the practicalities of collating data from a wide variety of different locations across a wide site area, or even across multiple related sites. This can, however, be overcome via use of wireless technology, or a network of individual telemetry elements. An example of this can be seen in Hölscher Wasserbau’s high technology groundwater management project for the Copehnagen Metro, where a single data centre set up at the Denmark office can communicate, control and review data for each of the more than 40 systems that are being operated around the city.



As Hölscher are able to develop bespoke, project-based SCADA systems in-house, Project Dewatering are able to offer their clients a range of monitoring packages to suit projects of any scope and budget, which just goes to further emphasise the unique benefits we are able to offer our clients because of the close working relationship we have with our parent company. If you would like more information about this comprehensive, bespoke and innovative monitoring system, or would like a demonstration or consultation with our experienced experts to see how it could benefit your construction project, get in touch today via 01473 658 807 or – We look forward to hearing from you.