Debris flow shelter

The debris flow shelter forms an integral part of the proposed scheme. Since announcing the preferred route in June 2023 design development work has continued at pace.

The structure is technically complex and requires input from a wide range of global design specialists. Some aspects currently under development include:

• Structural and geotechnical loading on the structure (to safely mitigate impacts from debris flow events and boulder impact).
• The design of the catch-pit to capture material and avoid direct landslide impacts to the structure (mitigating impacts to the water environment and culverts required below the structure).
• Aesthetics and how best to integrate the structure into the surrounding landscape (consideration of slanted columns, potential for a green roof).
• The potential for day and or night-time lighting within the structure (taking into consideration the geographical location and changes in natural light during different seasons).
• Operational requirements (procedures and requirements in the event of an incident or breakdown) and how debris material can be safely and efficiently removed from the catch-pit following a
• A fire safety assessment to identify and mitigate potential fire risks and hazards. This includes ongoing consultation with emergency
• Construction phasing and sequencing which includes consideration of hillside geotechnical monitoring, traffic management requirements, the use of modular construction and pre-cast units etc. Constructability work done to date indicates it is likely that the A83 will need to be closed for a significant period during the construction phase, with traffic diverted to the Old Military Road.