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Kerepehi WTP Raw Water Storage Tanks

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Client:
Hauraki District Council
Date Completed:
May 2025
Value:
3m
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The Result

Neuflow was engaged as the Project Manager for the Kerepehi Water Treatment Plant upgrade, a critical infrastructure project ensuring water resilience for the Hauraki Plains communities. This $3million project involved the replacement of an aging raw water storage tank with two new 2000 m³ storage tanks and pipe connections, overcoming significant design and site constraints.  The new storage tanks provide improved capacity and structural integrity, safeguarding against disruptions in raw water intake.  Neuflow’s project management expertise was instrumental in navigating the complexities of this upgrade, delivering a solution that meets both engineering and community needs.

The Project

The Kerepehi Water Treatment Plant provides potable water to settlements including Ngatea, Turua, Waitakaruru, and Kerepehi, processing 15,000 m³ of water per day. The plant sources water from the Waihou River, which is influenced by tidal flows. Due to high salinity and sedimentation source water pumping is time constrained, necessitating sufficient storage capacity to maintain treatment operations.
The existing raw water storage tank, constructed in the 1940s, exhibited significant degradation, including calcium leaching, which may have compromised its structural integrity. Hauraki District Council identified the need for a resilient upgrade to maintain long-term water security. Site limitations and cultural considerations required careful planning to select the most appropriate location for the new infrastructure.
Project Scope
To address these challenges, the Council approved the construction of two new raw water storage tanks, each with a 2000 m³ capacity, 17m in diameter, and 9m in height. The foundation work alone required 200 tonnes of concrete per tank. The project also included upgrading the inlet and outlet pipework to integrate the new storage system seamlessly into the treatment process.

Our Approach

Neuflow was engaged to oversee the project from procurement through to completion. Our responsibilities included:
  • Procurement strategy, contract administration, and tendering process
  • Managing stakeholders, including neighboring industry, and geotechnical specialists
  • Overseeing construction and coordinating contractors, ensuring compliance with regulations and project milestones
  • Managing scope variations, budget changes, and unforeseen geotechnical challenges
Challenges and Solutions
One of the key challenges was the evolving project scope. Significant design changes arose due to geotechnical issues and piling costs, requiring adjustments in both budget and execution strategy. Additional scope modifications were made to include essential water connections for improved system functionality.
Once the above-ground construction commenced, Reliant Solutions delivered the construction phase efficiently. The final pipework and water connections are scheduled for completion in May 2025.
Pic credit Ethan - Reliant Solutions

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