Kerepēhi Raw Water Upgrades

Raw Water Storage Reservoirs

Construction of the two raw water reservoir tanks is now completed. Pressure testing by filling the tanks with water was carried out in October (see photo below).

The next step will be to connect the tanks to the raw water intake.

Why are these tanks needed?

At its previous processing throughput, the water treatment plant held about 24-hours of raw water reserves. The water supply was influenced by the tidal conditions of its source, the Waihou River. It could also be adversely affected by severe weather events.

The two new tanks will add around four million litres of additional storage - providing a continuous supply and significantly reducing the possibility of a water shortage.

Construction was carried out by Reliant Solutions Limited, who also constructed the two treated water storage reservoirs at the site in 2018. The two new tanks were constructed simultaneously at the back of the treatment plant.

Feel free to take a look at the timelapse video featured on this page. This shows the construction process from the ground preparations to the finished tanks.

Raw Water Main

Steady progress is being made to construct and connect the new intake pipleline to the two new water tanks. The previous 5.3km-long water pipe that supplies raw water had come to the end of its life and has been replaced with a wider pipe.

Plans are in progress to choose the best time to switch everything over with as little disruption as possible.

Above: The red and blue line is the water main which has been replacedThe budgets were approximately $2.7 million for the tanks and $6.05 million for the pipeline.

We’ll keep you up to date right here on every step of the upgrade.

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