Duration: TBC

Location: Warkworth

Status: Planning

The latest

To enable growth in north Warkworth and reduce overflows into the Mahurangi River in wet weather, we need to construct the Warkworth growth servicing wastewater pipeline – a new large-diameter pipeline from Warkworth Showgrounds to the new Lucy Moore Pump Station as part of the larger Warkworth wastewater servicing scheme.

In parallel to finalisation of the alignment of the northern section of this pipeline, from the showgrounds to the Hill Street intersection, we have been investigating options for the southern section through the town centre.

Our engineers met with engineers representing the One Mahurangi Business Association to discuss the potential routes at a workshop in August.

Since our workshop we have been continuing to assess the viability of several options for the southern section of the pipeline. One option put forward by the business association was a pipeline situated beneath an elevated walkway along the riverfront. We have since ruled out this option as it was deemed the most challenging to consent and would pose significant environmental risks during delivery.

We are continuing to investigate the best route and construction methodology, while considering factors including affordability, impact to the community, environmental impact, cultural factors and the long-term operation of the asset.

One option we are looking at in greater detail is a combination of open-trenching and trenchless construction from the Hill St intersection to the Lucy Moore Pump Station. A trenchless section would need strategically-placed launch/reception shafts. A section of Elizabeth St would still need to be trenched due to the required depth of the pipe. We are currently undertaking geotechnical investigations to confirm if this option is viable.

Earlier this year we gave a commitment to the community that we would share the approach we plan to pursue before Christmas. At this stage, we plan to submit a recommendation to our Board of Directors for consideration at their December meeting. If a decision is reached earlier, we will let you know.

Even after a preferred route and construction methodology is selected, it’s likely that design and consenting will take about 12 months. We understand the community will be eager to meet with us and learn more about the likely timeframe and impact. We will share this information as soon as we have it, and intend to organise a range of community information sessions and open days for early 2025.