Improving the stormwater system
We are extending the existing stormwater network to create separate stormwater and wastewater networks.
This project is part of the Western isthmus water quality improvement programme and will be delivered in partnership with Watercare.
Construction started in 2024 and will take approximately nine years to complete.
What the project will do
The Waterview catchment is currently serviced by aging infrastructure dating back to the early 20th century. The pipes carry both wastewater and stormwater.
Usually, the network carries the wastewater to the treatment plant. During heavy or long-lasting rain, the system can overflow and release stormwater mixed with diluted wastewater into Oakley Creek and the Waterview Inlet.
The project is designed to reduce these overflows to 2-5 spills a year. This will improve public health by significantly reducing waterway contamination.
The new network will:
- significantly reduce combined wastewater and stormwater overflows into Waterview Inlet and Oakley Creek
- improve water quality at Waterview Inlet and Oakley Creek
- improve the environment for people, birds and marine life
- increase stormwater network capacity to support future growth in the area
- reduce the risk of flooding to residential and commercial Waterview properties.
How we will do this
We will use both traditional trench digging and trenchless methods to construct:
- 6.4km of stormwater pipelines
- approximately 250 private stormwater drains
- new stormwater outfalls.
