With construction set to start in 2019, the $1.2bn Central Interceptor is one of the most significant wastewater projects in Auckland’s history and one of New Zealand’s most ambitious tunnelling projects.
The 4.5m diameter tunnel and link sewers will consist of 17 shafts at 16 locations and connect to existing networks along the 13km route between Western Springs and the Mangere Wastewater Treatment Plant. The tunnel will be up to 110 metres below the surface, crossing 15 metres beneath the Manukau Harbour.
You can find more information about the project in this fact sheet.
