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Central Interceptor TBM launches

Watercare Central Interceptor TBM

On 30 July, Tunnel Boring Machine (TBM) ‘Hiwa te Rangi’ (roughly translated, ‘vigorous growth’, a promise of a prosperous season) set off on her 14.7 km journey under Auckland city.  

 Auckland Mayor Phil Goff gave orders to start up the TBM at a launch ceremony at a construction site next to Māngere Wastewater Treatment Plant. 

The TBM began cutting at the bottom of the 40 m launch shaft and will travel north to its ultimate destination in Grey Lynn.  

The Central Interceptor is an NZD$1.2 billion (AUD $1.14b) wastewater tunnel, which, once completed, will be New Zealand’s longest bored tunnel.  

Providing both storage and conveyance, it will hold 226,000 m3 of water and provide significant environmental benefits to the area.  

Historically, heavy rain has overwhelmed the network, creating overflow into neighbouring streams.  

Mayor Goff said the Central Interceptor will reduce overflows into waterways and harbours, improving water quality and ensuring clean, safe beaches.  

Wastewater is to be stored and conveyed at the Māngere Wastewater Treatment Plant and the tunnel has been designed to operate for 100 years.  

Mayor Goff also said that, once operational, the Central Interceptor tunnel will stop more than 80 per cent of wastewater overflows from Western Isthmus.   

Hiwa te Rangi, according to Māori legend, is one of the Matariki stars to which Māori would send their dreams or aspirations for the new year. 

The name was chosen by students who attend school along the route.  

Soil conditions will dictate the TBM’s progress, which is likely to be around 12-16 m per day. 

The project is scheduled for completion in 2025.  

For more information visit the Watercare website. 

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