Northern wastewater pipelines

​​As we build our new community in Peacocke we need to make sure we put the right infrastructure in place at the right time, like pipes for our wastewater.

Work is under way to build two new wastewater pipelines to connect the new Peacocke ​neighbourhood in the south-west with Hamilton's existing wastewater network. Council has contracted CB Civil to do this work. 

The 5.5km pipes will run from Cobham Drive (SH1), along the East Town Belt and Wairere Drive and connect to the existing wastewater network near Crosby Road. The pipeline will eventually link up with a new pump station to be built in Peacocke. 

Together these two new pipes can move up to 325 litres of wastewater per second! That's the same as filling one paddling pool every second.

How are we doing it?

We're using a combination of open trenching and directional drilling to build the pipeline.

  • Open trenching involves digging a channel and laying the pipe inside it. This will be used along the East Green Belt and alongside roads.
  • Directional drilling involves using a drilling machine to push and pull the pipes underneath the ground. This will be used where digging a trench would be too disruptive, like crossing major roads and train lines.​

Timeline​

Work to install the pipeline started in early November 2020 and will take nearly two years. The project is expected to be completed in 2022. The work is being done in stages, with each stage taking two to three months to complete.

Here's a general timeframe for when we'll be working in each area:

East Town Belt (Flynn Park to Marist Park): November 2020 to July 2021

Ruakura (Ruakura Road to Tramway Road): May 2021 to October 2021

Tramway Road (south of Fifth Avenue): June 2021 to November 2021

Wairere Drive (Tramway Road to Carrs Road): May 2021 to April 2022

East Town Belt area park restoration works

Construction on the new wastewater pipeline connecting the Peacocke community to our existing network is nearly complete. With over 85% of the pipeline installed and the project six months ahead of schedule, our crews are expected to wrap up construction in March 2022.

As part of the final stage of the project, work is currently being done in the East Town Belt parks – Flynn, Clyde, Lugtons and Marist - to restore grassed areas and complete replanting in areas where the pipeline has been installed. A significant part of the project planning considered the sustainability and environmental impacts of construction and how we can employ innovative solutions to mitigate any adverse effects.

The sections of the pipeline installed in the parks used the 'open cut trenching' method which means large channels were dug out before laying the new pipes and then filling in the trenches. Usually to "guarantee" the resurfacing part of the job, the original material is taken from an area and new easily compactable material is brought in its place. Through the East Town Belt, our crews sorted through the excavated material and recycled as much material, such as soil, sand and gravel, as possible that was then used to fill in the trenches. It's expected that in some areas, and over time the material will marginally settle, and this may cause uneven ground surface in some areas.

The approach we've taken in the East Town Belt area meant we could install the pipeline before the winter months and reinstate the parks areas quickly and safely for our community. Now with drier weather and firmer ground conditions, we're coming back to the parks to fix any areas of ponding or uneven ground surface to restore them back to how they were.

Re-using excavated material across a significant portion of the project has resulted in a range of benefits, including:

  • reduced green house gas emissions from transport and haulage of materials
  • reduced truck movements and heavy vehicle traffic on surrounding roads
  • decreased the volume of material removed and disposed of at managed fill sites
  • reduced the amount of new material brought in from off-site locations like quarries
  • reduction in projects costs
  • contributed to faster construction times
  • less disruption to the community

In combination, the benefits of recycling materials across the project has significantly reduced the carbon footprint of the project. Diesel-powered machinery used to extract new fill material and the heavy vehicles required to transport that to site are massive carbon emitters. Our project engineers have estimated 1090 metric tonnes of CO2 equivalent was prevented from being emitted due to the material recycling method – this is equivalent to more than 350 cars in the same period.

This is just one of the ways we are considering the environment and climate change as we grow.  We're working towards a low-carbon, resilient Hamilton, and recognise that we must consider the carbon footprint of every step it takes to get us there. Learn more about our work to reduce emissions in our Climate Change Action Plan. Our approach to sustainability and the actions taken to mitigate the impacts of the pipeline construction have produced great outcomes for Council and the community. We're working on embedding climate change into all Council decision making, including working closely with our project partners as we build and upgrade essential services in the city.

Images of open cut trenching sections in the East Town Belt area and parks where recycled material were used. 



Get in touch

If you have any questions about construction, please get in touch with CB Civil:

Phone: 0508 779 4636 - 0508 PSW INFO
Email: psw@cbcivil.co.nz 


Page reviewed: 19 Jan 2022 8:52am