NORTHERN RELIEF TRUNK MAIN
CLIENT: Stronger Christchurch Infrastructure Rebuild Team (SCIRT) - Downers
COMPLETED: 2016
The Northern Relief Trunk Main conveys wastewater for approximately 70,000 people from the north and west of the Christchurch to the Christchurch City Council (CCC) Pump Station 1 on Woodham Road. The Northern Relief Trunk Main is considered a critical asset within the CCC wastewater network.
The existing main suffered significant damage during the Canterbury Earthquakes, particularly in the vicinity of the Avon River where there was evidence of liquefaction, settlement and lateral spread.
The existing alignment is largely through the Residential Red Zone and crosses beneath the Avon River via an inverted siphon.
The new alignment (installing 1400mm diameter GRP pipe) typically ran along Council owned carriageways (Retreat Road and Eveleyn Couzins Avenue) and across Council owned land currently occupied by Pump Station 8 and community buildings.
