Green Square Stormwater Drain Project

This project is in the Green Square and Alexandria areas.

Construction started in May 2015 and is expected to be completed by mid 2018.

Suburban road with cars and trees

Part of the new stormwater drain is in Joynton Avenue, Green Square.

About Green Square Stormwater Drain Project

Planning for growth in Green Square

In partnership with City of Sydney Council, we've started to build a large 2 km underground stormwater drain from Epsom Road, Zetland to the existing stormwater system at Alexandra Canal, Alexandria.

This work is part of the plan to provide stormwater services to accommodate growth and development in the Green Square area. It's a key part of our commitment to urban renewal and our Liveable Cities strategy.

The new stormwater drain will significantly reduce flooding in and around the Green Square Town Centre during torrential rain - particularly at Joynton Avenue and on Botany Road.

Design and construction

Sydney Water and the City of Sydney have formed the DG Alliance with UGL Engineering, Seymour Whyte Constructions, Parsons Brinckerhoff and RPS Manidis Roberts to build the stormwater drain.

Detailed design continues for some sections of the stormwater drain. The new drain is being built using open trenching and microtunnelling across multiple locations simultaneously.

Construction started in May 2015 and is expected to be completed in by mid 2018. 

Group of large concrete pipes laying on the ground

Sections of the new stormwater pipe ready to be installed. 

We're building the new drain using open trenching and microtunnelling. Work will happen across multiple locations simultaneously.

Construction started in May 2015 and is expected to be completed by mid 2018.

So far, we've:

  • tunnelled over one kilometre
  • installed more than 600 concrete stormwater pipes between Joynton Avenue, Zetland and O'Riordan Street, Alexandria
  • started installing the section of drain that will pass under O'Riordan Street. This will take about two months to complete. Once it's finished, we'll start microtunnelling from O'Riordan Street to Perry Park, Alexandria. We expect that work to begin in the next few months. 

Site updates

Alexandra Canal

We started installing the drain between Maddox Street, Alexandria and Alexandra Canal, and under Huntley Street, Alexandria in early February 2016.

Work involves:

  • diverting and relocating existing utility services
  • widening the existing open channel along Shea's Creek, between Maddox Street and the canal
  • replacing the culverts under the bridge
  • upgrading the bridge deck.

We expect this work to take about 12 months, depending on the weather. 

Perry Park

We've finished building the microtunnelling pit at our work site in Perry Park, Alexandria. We'll use this to launch the microtunnelling machine when we install the section of drain from the park to Shea's Creek in Maddox Street.

We expect to start this work in the next few months. We won't be doing any work at this site until then.

Link Road to Joynton Avenue, Zetland

We're building this part of the stormwater drain, and working closely with affected property owners to minimise the impacts of our work.

Huntley Street Bridge

Work at Huntley Street has progressed. The north side of the bridge is finished and Huntley Street reopened to two-way traffic on 18 November 2017. Work will continue on the south side of the bridge until mid 2018. The November 2017 community update provides more detail. We appreciate the community's support during this important work. 

Night work in Alexandria and Zetland

View our location map to see where we'll be working at night.

24 hour microtunnelling work

Microtunnelling involves using a machine to dig an underground path, so we can install concrete pipes. We build pits at each end of the path to launch or retrieve the machines.

We've found some hard rock in the O’Riordan Street and Botany Road areas. In these situations, the microtunnelling machines must operate continuously until they reach the retrieval pits, for safety and operational reasons. This involves 24 hour work. 

Botany Road

At our Botany Road site, inside the Green Square Town Centre, we're working in two 12 hours shifts:

  • 6 am to 6 pm Mondays to Thursdays
  • 6 pm to 6 am Sundays to Thursdays. 

We'll also work a 10 hour shift on Saturdays from 8 am to 6 pm. To give residents around the town centre respite from construction, we don't work on Friday or Saturday nights, or during the day on Sundays.

The 24 hour work will continue for the next few months.

O'Riordan Street

At our O'Riordan Street site, we're working 24 hours a day, seven days a week.

The 24 hour work will continue for the next few months.

Review of Environmental Factors (REF) 

We've assessed the environmental impacts of building and operating the new stormwater drain. We explain these impacts and ways to minimise them in our REF.

We displayed the REF between 28 April and 23 May 2014.

We reviewed the nine submissions received and prepared a Green Square Stormwater Drain Decision Report.

To learn more, contact our Community Relations Team by:  

Sydney Water
Community Relations - Stormwater Program
PO Box 399