H2Our Health

Oamaru to Hampden Water Supply Pipeline

Project Description
The Herbert / Waianakarua and Hampden / Moeraki rural water supply schemes were struggling. They were not able to meet the latest NZ Drinking Water Standards and were prone to running out of water in summer. It was determined the most cost-effective way to resolve this was to supply the communities with potable water from Oamaru.

Services Provided
Fluent Solutions was engaged by the Waitaki District Council in 2016 to investigate options, design and supervise construction of a 34km pipeline from Oamaru to Hampden that could connect into these rural water supply networks feeding communities with drinking water meeting the NZ Drinking Water Standards from the Oamaru Water Treatment Plant.
The project was officially opened by the Waitaki Mayor on the 15th September 2018 and consisted of the following works:

  • 34km of oPVC pipeline (the longest in NZ at the time of completion) and PE pipeline through farm land
  • Two booster pumping stations connected along the route connected to the Council’s operating system via SCADA
  • A chlorine booster system installed at one of the pumping stations
  • Several major waterway crossings including a 200m long drill shot under the Kakanui River

Challenges
Extensive modelling was required to assess the combined hydraulics of the two schemes and the impact of running a new supply into them. It was also important to Council that the majority of the pipeline was located in farmland to help reduce costs that would be associated with working within the State Highway. This required significant liaison with landowners along the pipeline route to gain their approval. The pipeline eventually passed through 41 different landowners’ properties.