Hill Dam is complete - despite wet weather

1th July 2016 | John Gransbury

This winter has been extraordinarily wet, and that made lining of Hill Dam almost impossible to complete. The lining subcontractor has been a major disappointment, causing costs for everyone far beyond what was possible. An innovation and a lot of money pulled this part of the project back from the brink. A plastic mesh was placed over the wet clay so foot-traffic didn't leave ridges that would impact the 1.5mm thick HDPE white plastic liner. The integrity of the liner has since been verified by the leak detection system. The liner covers 100,000 square metres and the industry standard defines 20 holes of 2mm diameter as acceptable. A great specialist called Geotest subsequently found only two holes smaller than that and fixed them. Finding a needle in a haystack would be much easier!


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