In 2021, the National Trust commissioned AECOM to design the restoration of Goldrill Beck and its floodplain in the Lake District.
The river had been heavily modified in the past, with historic straightening and floodplain agriculture taking their toll on the natural environment. AECOM was tasked with returning the river to its natural processes while also removing erosion risks to the nearby road.
Hydraulic modelling
The project involved a fluvial audit to establish a process-based understanding of the system, options refinement, and 2D hydraulic modelling to quantify impacts of the design to flood risk and hydraulic habitats. We produced detailed designs that would allow the river to flow naturally and be restored to its former glory. After our design was implemented, the restoration was a tremendous success. The wet woodland habitat was reconnected with the river, and the restoration resulted in rapid development of gravel bed habitats in the restored channels. Natural processes, such as the self-recovery of dynamic channel features, were improved dramatically. The restoration also allowed the river to be reconnected with the floodplain, increasing biodiversity and water quality. Increased sediment sequestration to the floodplain further improved water quality.
Overcoming challenges
The project faced various challenges. We had to work closely with the National Trust to resolve issues such as the risk of anthrax cattle carcasses having been buried on site. Additionally, access and egress ramps were designed using repurposed spoil from channel excavations. We also provided ongoing contractor management for the National Trust throughout the construction phase. This included validating or rebutting claims for additional contracting fees and completing a CDM health and safety file.
Successful river restoration
Overall, the Goldrill Beck River Restoration project was a great success. AECOM’s design allowed the river to be returned to its natural state and be reconnected with the floodplain, resulting in improved biodiversity and water quality. Our close working relationship with the National Trust allowed for successful resolution of various challenges throughout the project.