Hero Image

Major upgrade planned for key Melbourne sewer

Yarra River at Westgate

A major Melbourne sewer, responsible for carrying more than 30 per cent of the city’s wastewater to the Western Treatment Plant is about to get an essential upgrade to boost its capacity.

Work on the Hobsons Bay Main Sewer by Melbourne Water will ensure the reliability of the city’s sewerage service for the next century.

The sewer is integral to the Melbourne sewerage network, running from Westgate Park in Port Melbourne to Spotswood and crossing under the Yarra River.

It was originally built in the 1960’s.

Melbourne Water’s General Manager Major Project Delivery Eamonn Kelly said the 2.1m diameter reinforced pipe, which can handle flows of up to 7700 litres per second, would be upgraded.

Wastewater flows will diverted into a new sewer main while works are underway.

“The duplicate sewer main will allow for this upgrade to be completed safely and efficiently. It will ensure the continued smooth operation of the sewer network which caters for Melbourne’s growing CBD and bayside suburbs,” Mr Kelly said.

Two shafts up to 30m deep will be constructed either side of the Yarra - with a Tunnel Boring Machine used to construct the new sewer main.

“The project team is currently working on the design, taking into account the challenging ground conditions on either side of the Yarra River and the existing active sewerage system,” Mr Kelly said.

Mr Kelly said the project will allow future opportunities for South East Water to connect into the system to remove waste water to turn into Class A recycled water for use in the Fisherman’s Bend precinct in facilities such as toilets and gardens.

Melbourne Water has released an expression of interest for the project, from which a very limited number of contractors will be invited to tender.

The project is due to be begin next year.