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  Green Square - Trenchless Construction for Australia’s Largest Urban Renewal Project

  Sydney’s Green Square is Australia’s largest urban renewal project, which involved transforming old industrial land into a major new residential, retail and cultural hub. The Green Square Stormwater Drain came about through a strategic alignment between City of Sydney and Sydney Water to address flooding in the Green Square area. Through a process of optioneering and hydraulic analysis, a new 2 km long underground stormwater drain including 1.4 km of multiple 1800 mm diameter pipes was installed by microtunnelling, and an anchored retaining wall replaced an open trench box culvert. The new drain augments the existing trunk drain system and reduces flood hazard, allowing the greater project to proceed. The trenchless (microtunnel) solution offered an alternative, value-for-money approach that reduced impacts on the environment and the community.

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