Before tunnelling for the West Gate Tunnel Project begins in 2019, we need to divert a 600 metre section of the North Yarra Main Sewer.
Diverting a sewer is a massive job that involves excavation, piling, tunnel boring and changes to traffic – and we’re going to build it without interruption to sewerage services during the diversion works.
The North Yarra Main Sewer
The existing North Yarra Main Sewer is 2.6m in diameter, over 100 years old and made of brick.
The sewer runs below the centre of Whitehall Street in Footscray and Yarraville, and it carries 20% of Melbourne’s sewage.
Building a new sewer
To keep the old sewer operating all the time, a mini tunnel boring machine (TBM) will create a route for the new sewer. As the mini TBM moves through the earth at the rate of about 12 metres a day, glass reinforced plastic (GRP) lining is installed around the tunnels to seal it and strengthen the structure.
Once the new sewer is ready to operate, a gap will be opened in the wall of the old sewer so sewage can start flowing via the new tunnel.
When the diversion is built, over 9,000 cubic metres (3.6 Olympic size swimming pools) will have been excavated.
What you will see
Worksites will be established on Whitehall Street, and there will be significant changes to traffic between Leek Street, Yarraville, and Parker Street, Footscray.
The safety of all road users and our workforce is a priority. Detours will be in place and safety measures including temporary barriers will provide crews the access and space needed on Whitehall Street.
These changes will start in May 2018 (timing subject to change) and will be in place for approximately 12 months.
During works, there will be some unavoidable disruptions in the local area for motorists, cyclists and pedestrians.
We have worked closely with local businesses and residents to plan these traffic changes, and will continue to work with them to plan and manage construction and traffic impacts as best as possible.
During construction, Whitehall Street will be closed northbound between Leek Street and Somerville Road, and reduced to one lane in both directions between Parker Street and Somerville Road.
Keeping you moving
We will minimise disruption as much as possible and keep you informed through:
- clear signage and traffic controllers to direct traffic
- providing regular updates about our works
- increased monitoring and support for enforcement of truck curfews and local destination exemptions.
For more information, our team is available 24 hours a day on 1800 105 105.