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    Coates–Brefni stormwater upgrade: temporary works lessons for road engineers

    November 27, 2025|

    Reviewed by Joe Ashwell

    Coates–Brefni stormwater upgrade: temporary works lessons for road engineers

    First reported on Roads & Infrastructure (AU)

    30 Second Briefing

    A stormwater upgrade on Cliff Drive in Leura, NSW’s Blue Mountains, replaced a failed culvert after landslip damage from repeated extreme rainfall, with civil contractor Brefni working on steep terrain and in environmentally sensitive bushland. Coates supplied an integrated shoring and dewatering solution plus plant hire, enabling safe excavation and culvert installation in unstable ground conditions while maintaining road access. The project was completed ahead of schedule and has since received an industry award, signalling the value of coordinated temporary works design in landslip-prone corridors.

    Technical Brief

    • For similar landslip-prone corridors, coordinated shoring–dewatering design is becoming standard risk control for culvert renewals.

    Our Take

    Within the 62 Infrastructure stories in our database, very few are tagged simultaneously as Projects, Safety and Failure, so the Cliff Drive works in Leura sit in a smaller subset that explicitly links construction delivery with learning from prior asset performance issues.

    NSW and the Blue Mountains feature in several safety-tagged infrastructure items in our coverage, suggesting local authorities are under sustained pressure to address legacy drainage and slope-stability vulnerabilities on constrained road corridors similar to Cliff Drive.

    For plant-hire and temporary works providers like Coates, being associated with an award-winning stormwater upgrade in Australia positions them well for future risk-averse councils that increasingly want contractors with a demonstrable track record on failure remediation rather than just lowest-cost supply.

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    Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.

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