Pukaki Irrigation Scheme: Monadelphous – $ 3 Million
JOB NAME: Pukaki Irrigation Scheme
START DATE: October 2017
CONTRACT COMPLETION DATE: October 2018
ACTUAL COMPLETION DATE: October 2018
CONTRACT VALUE: $ 3 Million
FINAL VALUE: $ 3 Million
Pukaki is a recent example of CB Civil’s ability to resource a structures project with an experienced
team, self-perform construction using PERI formwork systems, coordinate with complex M&E installation,
and carry out the necessary planning up front to ensure on time delivery.
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 irrigatorsand overcome varying onsite topography.
In 2017, CB Civil were subcontracted to head contractor Monodelphous on this design build contract
to construct seven large reinforced concrete structures, cast insitu on the Pukaki Irrigation Scheme,
and associated civil works.
The scope of works included:
• Construction of large intake structure – 18 x 8 x 6m
• Construction of three pressure reducing valve chambers – 10 x 6 x 3m
• Pond inlet spillway structure, complex geometry – 20 x 5 x 2m, with tapering floor structure poured on sloping grade
• Pond outlet structure – 8 x 8 x 6m
• Road crossing culvert structures
• 60+ thrust blocks
• Coordination with M&E installation
• Construction of a 15 x 5m siphon building
Our structures workforce peaked at around 20 staff.
From the start, the project presented tight timeframes with a short mobilisation period. To ensure we would
complete the project on time, we developed methodologies incorporating Monodelphous’ management systems.
Through upfront planning, deploying our experienced team and implementing the PERI formwork systems,
construction proceeded to programme. Mix designs were developed, optimised to the alpine conditions,
long concrete delivery travel times, and set times.
Flexibility was key to integrate Monodelphous’ M&E installation contractors. We worked collaboratively
with them and adapted our sequencing when required. CB Civil was responsible for all quality requirements, including on site / off site testing, production of ITPs, and progressive QA approval with Monodelphous. This ensured the work we were producing was delivered to a high-quality standard with no rework.
Despite having to deliver numerous structures in a remote and challenging location, we completed the
project with zero defects on final handover, on time as planned, and delivered safely with zero LTIs. We have since secured further work with Monodelphous as a result of this performance and our proven ability to coordinate well with their team.