Erosion assessment and scour design for the power line near Langholm

Challenge

We were commissioned by Balfour Beatty to provide design services for the Ewes Water river bank, adjacent to a pylon owned by Scottish Power, which has suffered erosion in previous winters.
A desk and field-based fluvial audit and ecological assessment was undertaken for the watercourse in the vicinity of the powerline to:

  • Appraise existing conditions
  • Identify constraints within the reach
  • Consider possible mitigation options to address the ongoing erosion of the river bank

Solution

The design criteria were determined based on a range of factors including:

  • Ecology
  • Geomorphology
  • Geotechnics
  • Constructability
  • Maintenance
  • Safety

The resulting design provides a more stable channel, that will reduce the risk of erosion to both the left bank at the pylon and the right bank just downstream, and has been undertaken with the physical constraints of the site in mind. The design of the left-hand bank was conventional using rip-rap and seeded coir blanket. However, on the right bank the design uses root wads to create green-bank protection.

Benefits

The design drawings were produced using a 3D model, which comprised topographic and hydrological data, streamlining collaboration between the team.

Contact us

For further information: Caroline Anderton



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