Hunua No.4 Watermain

Hunua 4 Watermain, NZ

This project saw John Holland and joint venture partner, Fulton Hogan, build a 22 kilometre section of pipeline through Auckland city, from Manukau to Onehunga, to ensure security of future water supply and to cater for population growth.

This 22 kilometre section of a 28 kilometre pipeline involved tunnelling under the Southern Motorway, constructing three pipe bridges over waterways, crossing over 950 existing services, 70 major relocations and commissioning to Water Care’s existing live bulk water system.

The project scope also included the laying of 15.5 kilometres of 2m diameter pipeline, 6.5 kilometres of 1.5m diameter pipeline plus smaller diameter sections, 16 major line valves, pits and ventilation, and numerous tunnelled sections, as well as extensive continuous traffic control, community consultation and stakeholder engagement.