en.Wedoany.com Reported - Watercare has completed one of the largest concrete pours associated with the Northern Interceptor, freeing up $7 million for other infrastructure projects. The Northern Interceptor is a major wastewater project designed to support housing growth, enhance network resilience, and redirect wastewater flows to areas with treatment capacity.

The wastewater works involved constructing a junction manhole that will allow wastewater flows from Hobsonville to be redirected to the Rosedale Wastewater Treatment Plant when the Northern Interceptor comes online in October.

Project Director Rob Purchell said the connection cost has been reduced from an estimated $25 million to $18 million. "That's due to strong planning, design improvements and proactive project management," Purchell said. "Delivering critical components on time and under budget means we can re-allocate the $7 million towards other initiatives in our $13.8 billion 10-year business plan (2025-2034)."

Head of Wastewater Andrew Douchak said the connection will help improve network performance as Auckland continues to grow. "Redirecting flows to Rosedale enables better use of treatment capacity in the north," Douchak said. "Over the next decade, wastewater flows from approximately 160,000 properties will progressively shift from Māngere to Rosedale, reducing pressure in the south and network-wide performance improvements."

Project Manager Paula Steinmetz said constructing the junction manhole was one of the more technically demanding aspects of the wastewater work. "Over 50,000 litres of concrete has been poured to form the walls of the new junction manhole," Steinmetz said. "The construction team used a 47-metre boom pump and specialist equipment, spending six hours placing the concrete and compacting it around tight pipe penetrations." The most complex section centered around the Wairau branch wastewater line, which sits just 150 millimetres from the base slab, requiring careful placement and compaction of concrete around the live pipe. She also noted construction partner SEIPP Construction delivered the work with minimal rework. With the manhole walls complete, crews will install the central column, two internal walls, precast headstocks, and the Northern Interceptor pipe inside the manhole.

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