Warkworth to Snells Transfer Pipeline

Customer: Watercare Services Ltd

Contract: Design & Construct

Location: Warkworth, Auckland, New Zealand

Water & Wastewater Solutions New Zealand & Pacific Islands

Fast Facts

  • 1.4 km long dual rising main
  • 3.6 km long single gravity sewer
  • 409 steel pipes each 1219 mm in diameter and weighing 6.85 tonnes

Drawing on our industry-leading trenchless construction experience, we're delivering the Warkworth to Snells Transfer Pipeline for Watercare, continuing our strong relationship with them.

The project is a component of Watercare's North-East Wastewater Servicing Scheme, conveying wastewater from Warkworth to Snells Beach. The scheme will cater for future growth and enable Watercare to decommission the existing Warkworth Wastewater Treatment Plant, which discharges into the Mahurangi River.

Our scope of works includes construction of a five kilometre wastewater pipeline from the upgraded pump station in Lucy Moore Memorial Park, transferring the wastewater to a new modern treatment plant at Snells Beach.

The new wastewater transfer pipeline comprises:

  • a dual rising main approximately 1.4 km long from the Warkworth Pump Station to a new break chamber, and;
  • a single gravity sewer approximately 3.6 km long from the break chamber to the Snells Beach Wastewater Treatment Plant.

The consented pipeline alignment runs beneath private farmland and due to the topography and access challenges, we're constructing the pipeline trenchlessly using a Herrenknect Direct Pipe MTBM (micro tunnel boring machine). We're installing the pipeline in three drives, requiring the construction of two large launch platform sites, one of which will be reconfigured for two of the drives.

We've put strict controls in place to ensure our team protect the surrounding environment while construction is underway. For example, early on in the earthworks phase our team spotted a dotterel nest in the dirt and a bird hovering nearby. We quickly erected a protective fence around the nest and all operators were alerted to avoid the area for the three week incubation period.

Consultation and communication with invested stakeholders on the project is also critical. We've established positive relationships early on and are continuingh to consult with mana whenua, Auckland Council, Rodney Local Board, utility providers, and affected landowners.

The project is due for completion in 2025. Watch this project update from September 2024...

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