Dunkirk Road wastewater upgrades project

The project

Over the past 18 months, we have been working on the corner of Dunkirk Road and Tangaroa Street to construct a new pump station. We have also been working along Dunkirk Road installing a new gravity pipeline. This infrastructure will enable further development and service the growing population while reducing the risk of overflows into the Tāmaki River.

Stage 1 works completed

• A new pump station on the corner of Tangaroa Street and Dunkirk Road. The increased capacity storage tanks and larger pumps will facilitate the storage of wastewater and reduce overflows during wet weather.

• A new gravity main along Dunkirk Road from Tangaroa Street to Johnson Reserve.

Earlier in the year, four 166,000 litre glass fibre-reinforced plastic storage tanks and four two-metre-wide maintenance holes were delivered to site. Before being lifted into place by crane, the team installed 160 sheet piles 14-metres underground and dug a further six metres to install the drainage and gravel bed for the tanks and manholes.

So, how do the tanks work?

Wastewater will be transported to them via a gravity main. The tanks will store wastewater until the network is ready for it to be pumped to a treatment plant. All this work will result in fewer wastewater overflows into the environment.

Stage 2 works

This project will take place at a yet to be determined time

• A new rising main from the Dunkirk pump station to take flows on a more direct route to the Eastern Interceptor.