Lower Foyers

Project: Lower Foyers Intake Channel Stabilisation
Location: Case Study Template
Client: SSE Renewables

The partial collapse of the intake channel wall at Lower Foyers required a comprehensive programme of repair and stabilisation. The works were carried out to restore structural integrity, protect critical infrastructure, and maintain the safe operation of the hydroelectric facility.

The project began with the draining and clearance of the intake channel to create safe access. A scaffold system was installed within the channel, allowing a detailed survey of the existing wall heads to be completed and findings shared with SSE Engineering. Due to the poor condition of the remaining wall sections, both sides of the channel were reduced to the level of the existing concrete base.

A new cranked concrete base was poured, with 15 m³ of material forming a stable foundation for the replacement structure. Thirty Kelly blocks, each weighing 2.4 t, were then installed with a 40-tonne long-reach excavator to restore the channel to its original level. Behind the new retaining walls, 75 metres of filter drain were constructed to tie into the station stormwater system, improving long-term drainage and resilience.

Structural integration works tied the Kelly blocks into the existing walkway base through blockwork panels, while a new key clamp handrail was installed to enhance safety along both sides of the channel. Final works included the regrading of the car park and improvements to access and maintenance walkways around the intake.