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Pukaki Irrigation Scheme

Lake Pukaki, New Zealand

Project execution period

September 2017 – October 2018

Project description

The Pukaki Irrigation Scheme delivers irrigation and stock water to approximately 6,000 hectares, over four high-country stations in the Mackenzie Basin. Water is delivered at sufficient pressure to drive pivot irrigators and overcome varying onsite topography.

Monadelphous Engineering New Zealand worked closely with the Pukaki Irrigation Company (PIC) from 2010 offering in-kind design support, pricing and survey services to develop the scheme through early feasibility, consenting, and concept design phases. The relationship developed through feasibility lead to the preliminary contract award for detailed design in 2015 in preparation for construction execution in 2017/2018.

Contract value

NZ$28 million

Scope of work

The scope of work included full design, supply, installation, construction and commissioning of the Pukaki Irrigation Scheme, including:

  • Seven-barrel siphon extracting water from the Genesis owned Tekapo Stilling Basin
  • 32km GRP/HDE pipe DN315-DN1300
  • Three mainline PRV stations
  • Construction of a Break pond
  • 10 property off-takes with isolation, flow measurement and pressure management
Highlights and achievements
  • Innovative distribution network design that takes advantage of the natural fall of the site to provide pressurised water to each high-country station (no pumps required)
  • Siphon extraction from Genesis Energy Ltd stilling basin into intake and screening chamber
  • Complex burial design (in-house) for varying pipe specifications and geology
  • Full telemetry and remote monitoring available over the entire site