Reservoir Level Monitoring
Following several days of heavy rain in August 2019, a major incident was declared by the Environment Agency – a warning was issued that the dam at Toddbrook Reservoir was in danger of collapse after concrete slabs became partially dislodged by high volumes of water due to the rain. As a result, 1,500 residents had to be evacuated from parts of Whaley Bridge, Furness Vale and New Mills.
Toddbrook Reservoir is situated above the town of Whaley Bridge in the Derbyshire High Peak area of England. It is owned by the Canal & River Trust and is fed by Todd Brook, a stream with a catchment area of around 1,700 hectares (4,200 acres) including moorland on Shining Tor and farmland around Kettleshulme village.
The Environment Agency (EA) needed reliable and proactive level monitoring of the Toddbrook Reservoir, that would enable the Canal & River Trust to monitor the pumping regime of the reservoir to manage the threat from flooding and potential collapse should the reservoir over-fill again.
The Metasphere ‘Reservoir Level monitoring’ solution monitors various level points in a reservoir. For this project, a Point Orange datalogger/RTU (remote telemetry unit) coupled with a low-power pressure transducer was installed at set-points, enabling the collection of level trend data to monitor the level of the reservoir. Two locations were selected: one upstream at the reservoir inlet, and the other in the bypass channel at the side of the reservoir. The data and events generated by the Metasphere solution enabled the Environment Agency to provide early flood warnings to the public and the data needed for the Canal & River Trust to manage the level of the reservoir.
The EA was enabled to:
- Provide early flood warnings to the public
- Change the transmission rate, based on the alarm threshold
- Remotely modify logger configuration
- Proactively manage the pressure and flood monitoring points of the reservoir level