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FLOODS & SUDS


Off-grid solar-powered flow


monitoring solution designed and installed by NIVUS


For redundancy purposes, two Nivus CS2 bed-mounted, cross-correlation sensors were fitted in each of the discharge pipes, and the same dual-sensor redundancy arrangements were established in the river flow monitor at Helston, albeit in a cross- channel configuration.


New NIVUS cross-correlation flow sensors fitted in the 1980s discharge pipe


gas bubbles which act as reflectors within the water body. Reflections are saved as images or echo patterns, and compared with a further scan which is conducted a few milliseconds later. Velocity is determined by measuring the beam angle of the positions of unambiguously identifiable reflectors. The method produces highly accurate readings without the need for additional calibration.


Explaining the background to the decision to invest in a cross-correlation solution, Will says: “The Nivus equipment has been assessed by the EA, and we now run both fixed and portable versions of the technology. Nivus is also a Framework Partner, so the procedure for implementing this solution was relatively simple, despite the specific challenges that this site presented.”


Uniquely challenging environment at Loe Bar


As a remote location Loe Bar does not 24


benefit from easy access to utilities, so it was necessary for the monitoring solution to be able to operate off-grid; solar/battery power was therefore adopted. The solution also needed to be sufficiently rugged to be unaffected by its proximity to the beach. “Nivus proposed a complete low-power solution, which calculated the power requirements and specified the solar generation capacity that would be necessary to ensure continuous monitoring in all weathers,” Will explains. “The solar panels were fitted at an angle to the sea, which was less ideal for power generation, but necessary to avoid potential damage from sand-blasting.”


Special low-power versions of the Nivus equipment were also deployed. For example, a Nivus NF750 transmitter employs low-power electronics, and consumption is minimised by setting the monitor to sleep, then wake up after 15 minutes to take a measurement, and then return to sleep mode.


| July 2025 | draintraderltd.com


The EA’s standard remote communication equipment was installed inside a kiosk along with the transmitter, a multiplexer, rechargeable batteries and a solar power regulator.


Access to the monitoring site is also limited. The closest that EA vehicles can access is 200m away, so any site visits would necessitate manual portability for any necessary equipment. Access to the monitoring locations within the pipes is also potentially hazardous – necessitating breathing apparatus and other PPE. Fortunately, therefore, the newly installed monitoring system does not require regular service or calibration.


Summary


Nivus installed the new monitoring system in March 2025, and Will says: “The performance to-date has been good – there have been no outages and there have been no requirements for a site visit. We performed manual checks on the monitors using a portable NivuFlow Stick and they are monitoring very accurately, representing a significant improvement on their predecessors. It is also comforting to know that we have the redundancy measures in place,” he adds.


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