Watercare completes East Coast Bays sewer link

Aug 12, 2024

Watercare has successfully finished the final connection on the East Coast Bays link sewer at Windsor Park in New Zealand.

Much of the East Coast Bays sewer link was installed using horizontal directional drilling. “Using this drilling method allowed the pipeline to be installed directly beneath the road and under houses, eliminating the need for excavation and prolonged traffic disruptions,” Watercare project manager Dirk Du Plessis said.

“It meant we could get the job done at pace and to a higher quality too. “Horizontal directional drilling is also better for the environment than open trenching as it lessens the impact on the surrounding residential assets.”

Measuring 1.75km in length and 800mm in diameter, the $21.5 million pipeline was constructed to handle the increased volumes of wastewater pumped from the new Mairangi Bay Pump Station to the Rosedale Wastewater Treatment Plant.

The new pump station pumps up to 625L per second – double the capacity of its predecessor. The East Coast Bays link sewer went into service in July and has been performing as expected.

‘The new pipe is currently diverting around 90 per cent of the wastewater from the old sewer main, significantly increasing transmission capacity and reducing overflows in the local network,” Du Plessis said.

“Both pipelines connect with each other just west of State Highway 1 before entering the Rosedale Wastewater Treatment Plant as one. “Although the new sewer main is carrying most of the load, the older pipeline continues to service many businesses and homes in the area and along Constellation Drive.”

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