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    Yass Dam Upgrade

    In 2013, Geotech completed the upgrade of the Yass Dam. This included the supply and installation of thirty-three 27-strand GEGA ground anchors. As part of the ANCOLD dam safety requirements, the anchors at Yass Dam are required to be inspected on a regular basis. 

    As a result of ongoing safety requirements, Geotech’s specialist anchor team was engaged by Yass Valley Council in 2020 for the inspection, testing and restressing (if required) of twenty-one of the 33 anchors located on the crest of the dam wall.

    The initial Yass Dam upgrade involved tripling the township of Yass’ potable water supply by raising the height of the existing concrete gravity dam by three metres.

    The scope of works included concrete excavation components of existing dam; in-situ reinforced concrete works on downstream face and over crest; the design, fabrication, installation of post tensioned GEGA anchors; earthworks; roadwork; bridge construction; mechanical fabrication and installation of a new inlet pipe system, including valve automation; working at heights; working on/over water; and environmental management of works in a watercourse.

    Geotech is at the forefront of ground anchor research and development. Yass Dam is the location of the world’s first post tensioned Carbon Fibre (CFRP) ground anchor. Thanks to the support of Yass Valley Council, the CFRP 27-strand ground anchor was installed into the dam’s right-hand side abutment.

    General information

    Location: NSW, Australia

    Contract Type: Principal Contractor

    Completion date: Upgrade completed in 2013, testing and maintenance completed in 2020

     

    Benefits

    • As a result of prolonged droughts within the region, the Yass Valley Council highlighted the significance of the upgrade, which is now a reliable asset for the broader community in the Yass district.

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