Mini Tunnel Boring Machine Completes Major CBD Sewer Works

02 October 2020

The biggest upgrade to Melbourne CBDís sewer network in more than 120 years has reached a milestone with City West Waterís completion of tunnel boring works to install a 900 metre-long new sewer under Lonsdale Street.

As part of the $21 million Lonsdale Street Sewer Upgrade, a 6.3-metre-long, 16.3 tonne tunnel boring machine (TBM) was used to make way for the new 1.5m diameter sewer pipe on Lonsdale Street, built between Elizabeth Street and Spencer Street. 

The TBM was lowered into a 23 metre-deep shaft in March this year and excavated from William Street to Elizabeth Street, before returning to William Street to complete its final 350 metre journey towards Spencer Street last week.

The new sewer will provide additional capacity to the existing sewer catchment, which was constructed in the 1890s and had been nearing capacity.

Expected future growth in the number of city residents, visitors and workers means an increase in the capacity of the CBDís current sewer network is vital.

The upgrade has created 35 jobs and will deliver efficient, safe and environmentally responsible sewerage services for the community.

Itís part of City West Waterís $80 million four stage capital improvement program to maintain service reliability for the fast-growing population of Melbourneís CBD.

The Lonsdale Street Sewer Upgrade project is expected to be completed by the end of the year and will link with the Spencer Street Sewer Upgrade (Stage 1) which was completed in December 2018.

Construction on Stage 3, which includes construction of a new sewer along Elizabeth Street, will begin in 2021.

Quotes attributable to Minister for Water Lisa Neville

ďThe new sewer will help to cater for expected growth of the inner-city population and ensure reliable sewerage services for years to come.Ē

ďThis significant investment highlights our work to deliver the essential water infrastructure the community needs and support local jobs.Ē




Source:  Victorian Government -

Date of Original:  18 September 2020

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