Northumbrian Water has announced a £2.7 million maintenance and safety project at a County Durham reservoir which is set to start this summer.
The water company is investing in the works at the dam and spillway of Tunstall Reservoir, in Wolsingham, following months of preparation and ground investigations.
Working with partners Esh-Stantec, the water company will fill an old shaft and tunnel, originally designed for drainage purposes, with expert support from mine rescue teams being required due to the necessary confined space working.
A new transfer pipe will also be installed within the structure to increase the amount of water that can be drained down from the reservoir in case of emergencies, helping to lower levels more quickly and increase safety.
This will transfer water from the west side of the dam, across to settlement tanks, where silt is removed before the water enters the spillway on the eastern end, into Waskerley Beck, and downstream to the River Wear.
The most visible work will be on the spillway, where concrete slabs will be overlaid on old stone blocks, to further preserve the structure.
Finally, new survey points will be installed on the dam to help monitor any movement in the structure.
To enable the project to take place safely, the process of lowering the reservoir’s water levels will begin in advance of site work commencing in July. Work is scheduled to be completed in early 2024.
Paul Wood, Northumbrian Water’s Project Manager, said the essential maintenance work will help ensure the future resilience of the dam at Tunstall Reservoir, as well as enhancing the company’s ability to react quickly in the case of any emergency.
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