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-2019.

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

Large pipes side by side in a row

The new pipe has been installed in sections.

In the past, areas around the Green Square town centre have experienced major flooding during torrential rain. However, since the new Green Square stormwater drain became operational in February 2018, the flood risk in this area has greatly reduced - particularly at Joynton Avenue and on Botany Road.

The construction of the Green Square stormwater drain has involved installing more than two kilometres of large underground pipes from Epsom Road, Zetland to the existing stormwater system at Alexandra Canal, Alexandra.

This work was done as 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.


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

The drain was built using open trenching and microtunnelling across multiple locations at the same time. Although the drain is finished and operational, the final stages of the project involve replacing Huntley Street Bridge and renewing the area around Alexandra Canal to make it an attractive and functional public space.

We built the stormwater drain using open trenching and microtunnelling techniques. This involved work across multiple locations at the same time.

Overall, we have:

  • tunnelled over two kilometres
  • installed concrete stormwater pipes between Joynton Avenue, Zetland and Maddox Street, Alexandria
  • built a brand new shared pedestrian and cycle path beside Sheas Creek stormwater channel, between Maddox Street and the start of Alexandra Canal to the south of Huntley Street
  • installed a sandstone finish to the widened Sheas Creek channel
  • restored and landscaped Perry Park and the areas along Sheas Creek.

Site updates

From an initial project footprint of over two kilometres, the project is now limited to the areas in Alexandria between Maddox Street and Alexandra Canal.

Sheas Creek

We've widened most of the Sheas Creek stormwater channel between Maddox Street and Alexandra Canal.

This work involved:

  • excavating along the existing open channel along Sheas Creek, between Maddox Street and Alexandra Canal
  • building a brand new, shared pedestrian and cycle path. This path will connect Maddox Street to Alexandra Canal
  • diverting and relocating existing utility services in Huntley Street so we could widen and replace the bridge
  • removing the culverts under the bridge to accommodate flood waters
  • upgrading the bridge deck in sections.

We are now relocating the telecommunications, water, gas and electricity services that run beneath Huntley Street Bridge. We're also building a new bridge to replace the existing bridge that has almost reached its lifespan.

We expect all our work to be finished in mid-2019. 

Huntley Street Bridge

Our work on the northern side of Huntley Street Bridge is nearly finished. Huntley Street returned to two-way traffic in November 2017 and apart from some planned night time road closures, this will not change until we finish our work. We'll keep the local community informed of all our upcoming night work.

The project has suffered unfortunate delays, but we're now progressing the relocation of telecommunications, water, gas and electricity services on the southern side of Huntley Street. The June 2018 community update provided 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. 

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