FAQs
What stage is the project at?
The project is currently in the planning stages. We have carried out investigative studies to confirm where the current pipeline and other services are below the ground, and to understand geological conditions to ensure the work can be carried out. This investigative work has helped confirm the route alignment and concept design, keeping in mind the economic, social and environmental impacts.
What are the benefits of the duplicated pipeline?
We are investing now to transform and integrate our water, wastewater, stormwater, and recycled water systems to ensure we can continue to provide safe, reliable and affordable services to customers as the region continues to grow.
The proposed pipeline will increase the resilience of local water supply by allowing water to be transferred between Thornleigh Reservoir and Thornleigh-Wahroonga Water Pumping Station to cater for the growing population.
This is not just about pipes. It's about water - clean, life sustaining water. Our work will ensure we can continue to give you clean and reliable water as the area continues to grow.
How long is the proposed pipeline?
The proposed pipeline will start at Thornleigh Reservoir in the south-east corner of the site. It will then be tunneled around 1.2 km to the south side of Zig-Zag Creek at Thornleigh-Wahroonga Water Pumping Station.
The new pipeline is the same diameter (180cm) and will run parallel to the existing pipeline. Like the existing pipeline, the new pipeline will run under private properties and cross local roads between 14 and 38 metres below ground level.
Will I be impacted by the works?
The proposed pipeline will benefit residents in the area where the population is expected to increase to 2.26 million by 2026. A trench-less construction method is proposed to reduce any impact on private property. We will provide residents with an update about the proposed works and timing prior to any construction works.
Will the pipeline pass under properties?
The new pipeline is the same diameter (180cm) and will run parallel to the existing pipeline. Like the existing pipeline, it will run under private properties and cross local roads between 14 and 38 metres below ground level.
Approximately 160 metres will be trenched within the Sydney Water owned Thornleigh Reservoir site and the remaining 1.2km of the pipeline will be tunneled using a small tunnel-boring machine. The tunnel-boring machine uses a ‘trenchless’ construction method to reduce the impacts on the environment and the community.
How can I make comments?
You can view and download the REF from the Document Library above.
The next step is for you to let us know what you think.
You are invited to make a written submission by Monday 18 December to thornleighIOM@sydneywater.com.au.