Cossey's reservoir - Cosseys Reservoir
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| Address : | Cosseys Reservoir, Auckland 2583, New Zealand |
| Postal code : | 2583 |
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★ ★ ★ ★ ★ Cosseys Creek Dam was the first of a series of rolled earth water supply dams in Auckland's Hunua Ranges which was completed in 1955. Auckland’s third largest dam, and it holds 14% of the city’s water storage. Dam is 49m high at the crest from the foundation and has a crest length of 170 m. The 230m long diversion tunnel links to the valve tower and scour systems. Reservoir covers 119 ha when full with a storage capacity of 14.5 million m3. The dam was built using residual clays and rubbles from greywacke-argillite rock with a puddle clay core to seal water seepage.
It took 14 months to fill the reservoir after the completion of the construction and the first spill occurred on the 12 July 1956.
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