A large gravel bar had accumulated within the bed of the River Tame adjacent to the Reddish Vale Country Park. Unfortunately, this caused the flow of the river to be pushed over to one side of the channel; undercutting and eroding the banks and threatening a popular footpath through the park.
We were contacted by the client to advise on the design and reinstatement of the river bank in three key locations and to provide a solution to prevent future natural channel adjustment destabilising the banks in this area.
Work / Solution
Severe erosion of the right-hand bank of the River Tame in Reddish Vale resulting from natural channel adjustment upstream. 15m length of cliff erosion, though the total length of works required was nearly 40m.
The original design obtained by the client was for a rip-rap bank protection using rock rolls & geotextile matting and, if this had been constructed, would have created a very hard engineered bank edge, with limited habitat potential.
After reviewing the design, we suggested an alternative utilising willow spilling with a geotextile and gravel-retained ‘coirnet’ on the landward side. The design also incorporated live willow woody material to help deflect flow away from the bank, and in doing so provided a more sustainable, long-term solution and one that works with natural processes.
The client was more than happy to go with this alternative design as it was cheaper, more sustainable and created a more natural looking erosion-resistant bank.
The completed works successfully reinstated the eroded bank margin along the River Tame. The final photo shows the site six months after completion with established vegetation growth, which is helping to protect the banks and to prevent against any future natural channel adjustment from destabilising the area.