Improving flood resilience on Sydney’s largest reservoir
Completed in 1960, Warragamba Dam is one of the largest domestic water supply dams in the world and accounts for about 80% of Sydney’s water—supplying more than five million people. The goal of a dam raise? To create a flood mitigation zone to reduce the risk to life, property, and community assets.
The Warragamba Dam is a concrete gravity dam, 142 metres high (465 feet) by 351 metres (1,151 feet) long, with a central gated spillway section about 90 metres (295 feet) wide. We explored options for raising the dam by up to 14 metres (46 feet) and investigated alternatives such as building a new dam to replace the existing one. After considering all the possibilities, we developed the best design option and a detailed concept design which would support the government business case. Combining local and global water infrastructure and engineering expertise, our team provided services including design, project management, 3D finite element modelling, construction sequencing, and flood mitigation concepts.
The Warragamba dam raise concept was completed in 2020. Now? We’re continuing to support Water NSW and now Water Infrastructure NSW as they advance to the project implementation stage. When completed, this dam raise will reduce the risk of floodwaters in the Hawkesbury-Nepean Valley.
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