Cooma Water Supply Augmentation


The project involved the design, development and construction of two post-tensioned, precast concrete tanks and associated pipework at Royal Hill (2.6 ML) and Church Hill (6.6 ML).

The two reservoirs were built concurrently over one year. The construction involved earthworks, demolition and removal of an existing bolted steel reservoir at Royal Hill, the pouring of post-tensioned floor slabs, manufacture and installation of wall panels on site, stitch joints between the wall panels, post-tensioning of the tank walls, construction of aluminium roofs and installation of associated pipework.

Key challenges

  • The project was made more challenging by extreme climatic conditions, with temperatures as low as –10°C. Extensive research and development was required to ensure that the concrete mix design satisfied the specification.
  • Both reservoirs had to remain in operation during construction, with no disruption
  • Leed had to relocate services including power lines before construction could commence
  • Both reservoirs were surrounded by residences. Leed assisted Cooma-Monaro Shire Council to successfully manage community relations including work hours, noise, dust and traffic, with no complaints
  • the two reservoirs were constructed concurrently with crews moving between jobs as required.


Design and construction of both tanks was completed within 52 weeks, on time and on budget, with no leaks or remedial work required.

As a result of cooperative approach adopted by all three parties, communications were open and honest and a successful working relationship was maintained.

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