Entrance to the MTBM Welding Project Hunua 4 Section 11 Hunua 4 is a 31 km long watermain running from Watercare’s reservoirs in Manukau to reservoirs in the Auckland CBD and has been designed to improve the capacity and resilience of Auckland’s water network. Using predominantly microtunnelling methods, we are constructing the new watermain using a micro tunnel boring machine (MTBM) to drive and install 2500 mm ID jacking pipes between six shafts, before lining the tunnel with a 1575 mm OD steel pipe. Once complete, two of the three pipe jacks will be the longest ever completed in New Zealand.
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