Watercare is constructing a new watermain to cater for population growth and to increase the security of the water supply to the Auckland region.
The Hunua No.4 (Hunua 4) will run for 28 kilometres from Redoubt North Reservoir in Manukau Heights to Campbell Crescent in Epsom, connecting to the existing local water supply network along the way. Ultimately the Hunua 4 will extend through the Khyber reservoirs in the central city.
Click here to see a map of the proposed route.
What is the project timeline?
Construction will take place from May 2012 to 2016. Construction will generally take place from North to South as follows:
Redoubt Road Reservoir to SH20
(Redoubt Road Reservoir to Aspiring Avenue, May 2012 - June 2013)
(Aspiring Avenue to Milan Road, Nov 2012 - Dec 2013)
2012 - 2014
SH20 to Mangere Bridge
2012 - 2015
Onehunga to Epsom
2014 - 2016
How is it being constructed?
Hunua 4 will be between 1.6 and 1.9 metres in diameter. It will mostly be laid under the road, though in some places, it will cross streams, private property and rural land. Watercare is liaising with these private property owners.
For the majority of the route, open trenching methods will be used to lay the watermain. In sensitive areas - such as busy intersections - more specialised construction methods will be used, eg. tunnelling or pipe bridges.
Traffic around the construction site will be carefully managed to minimise disruption to motorists.
What has been achieved already?
Several packages of advanced works have been undertaken in association with, or ahead of, other planned infrastructure works. The early installation of Hunua 4 in these locations reduces the overall disruption to the community and has enabled practical, cost effective integration of construction resources and personnel.
Advanced work completed to date:
Thomas Road, Flat Bush: a 225m length of Hunua 4 was installed within the road carriageway.
SH20 Manukau Harbour Bridge and approaches in Mangere Bridge and Onehunga: a 1.9km length of Hunua 4 was installed as part of construction of the new motorway bridge and on adjacent roads including railway crossings.
Princes Street, Onehunga: a section of Hunua 4 was installed across Onehunga Branch Railway Line during a 48 hour track closure.
Mt Smart Road, Onehunga: a cross connection between the existing Hunua 3 watermain and a section of Hunua 4 was installed along Mt Smart Road and Victoria Street.
Puhinui Station, Papatoetoe: a 150m length of Hunua 4 was installed across the North Island Main Trunk Line as part of the construction of a KiwiRail footbridge replacement.
For more information about the project, email the project team at: Hunua4@water.co.nz or call 0800 900 007.