Huntly Wastewater Treatment Plant Outfall

Waikato District Council

Project Scope

This project involved the construction of a new outfall pipeline from the Huntly Wastewater Treatment Plant to the Waikato River.

Major works included:

  • Construction of a new 315mm HDPE outfall pipeline by open trench and/or trenchless methods.
  • Connection of the new outfall pipeline to an existing pipeline at the treatment plant and associated transition pipework and manhole chamber.
  • Connection of the new outfall pipeline to an existing manhole adjacent to the Waikato River.
  • Installation of a sleeve pipe under the North Island Main Trunk Railway and installation of the outfall pipeline therein.
  • Compliance with Kiwirail and NZTA requirements for construction in state highway and railway corridors.
  • Removal of an existing section of pipeline within an open drainage channel.
  • Removal of existing wastewater manholes to below ground level and sealing of abandoned connecting pipelines.
  • Supply of all materials.
  • Reinstatement works.
  • Pressure testing and commissioning. 


This project was completed in April 2017.