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Major Sewer Upgrade work continues

29 April 2004

The construction of a new sewer pipe under Linwood Avenue is continuing with the pipe expected to cross the westbound lanes, under the avenue through to Linwood Park, in May.

In preparation, the City Council will be removing a pine tree, which lies in the route of the pipe, from Linwood Park on Wednesday 5 May.

Contracts engineer Tony Borkus says the tree, which is in poor condition, will be replaced with two new trees. City Care will do the work.

“We have chosen the best route for the pipeline and one which has the least possible impact on the established trees down Linwood Avenue.”

He says this next stage of work is expected to cause some disruptions to traffic as the pipeline is constructed across the westbound lanes on Linwood Avenue.

“Most of the work will be carried out during off peak hours, some time in the evening, to keep disruption to a minimum. Two westbound traffic lanes will be maintained at all times along Linwood Avenue, except on the night of the actual crossing when westbound traffic will be restricted to one lane after 6pm,” he says.

The new sewer pipe across Linwood Avenue is one of 14 projects involved in the $36 million upgrade to the city’s sewer system.

This pipeline will link the Christchurch Wastewater Treatment Plant, Bromley, with a new pump station on the corner of Bass and Randolph streets – going from Hay Street under Linwood Avenue to Linwood Park and then Randolph Street.

Trenching is about 3.5 metres deep and 2m wide to allow for the 1.2m concrete pressure pipe, Mr Borkus says.

The cost of the project is $4.8 million, with the Linwood Avenue crossing about $300,000 of that, he says.


The Rising Main No. 11 project is part of the Major Sewer Upgrade, a 10- year project that involves the laying of more than 30km of new pipelines; several pump stations, and the proposed construction of a large storage tank in the city.

These changes will allow the sewer system to cope with expected city growth and reduce sewage overflow into the city's rivers during wet weather.

More details about the Major Sewer Upgrade are available on the Council’s website at

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