The big pipes under Christchurch
With recovery repairs now over 60% complete, CWI looks at some of
Christchurch’s biggest underground wastewater pipes are currently being
repaired and in some areas require full replacements.
he Stronger Christchurch Infrastructure Rebuild
Team (SCIRT) is now working on the city’s two big-
gest pipes, the Northern Relief and the Southern
Relief, which service more than 200,000 households and
businesses in Christchurch.
These pipes account for more than half of Christchurch
population’s wastewater needs.
The Wairakei Diversion
The Wairakei Diversion has been repaired as part of the
major upgrade to the city’s wastewater network. Extensive
Merivale during 2014 and the
project was completed at the end
of last year.
To replace the wastewater
main, SCIRT contractor partners
needed to dig a trench. In some
parts of the project, groundwater
levels were so high that innova-
tive ways had to be used to drain
the trench to ensure crew safe-
ty and allow the teams to work
Most work on the Northern
Relief and Southern Relief
could not have begun until the
Wairakei Diversion was finished.
The large volume of wastewater
Contractors World International Vol 6 No 5
Contractors World International