Just 12 months after the arrival of 510 metres of large diameter HDPE pipework from Thailand, the Daldy Street Outfall has been handed over to Auckland Council’s Healthy Waters. Wynyard Edge Alliance (WEA) consisting of McConnell Dowell, Downer, Beca, Tonkin & Taylor and Auckland Council carried out the work. Relocation of the existing outfall within Wynyard Basin was required to improve water quality within the basin after the breakwaters had been installed that provided tranquility for the forthcoming 36th Americas Cup. The new extension runs along the entire length of Wynyard Point, an area formed nearly 100 years ago by reclamation from the Waitemata Harbour. A basalt breakwater was formed around its perimeter and infilled with hydraulic fill and excavated arisings from the CBD development. Historically, the area had been used for heavy industry – gas works, fuel storage and was heavily contaminated. The design of the new pipeline determined the pipe to be 3 metres in diameter for its upstream half, expanding to 3.5 metres diameter for the downstream half. HDPE pipe, in 15 metre lengths was ordered from Uponor in Thailand and delivered onto Wynyard Wharf last September. Daldy Street Outfall Auckland, New Zealand
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