McConnell Dowell is pleased to announce that construction on the new Ports of Auckland Outfall Upgrade Project will begin in late 2021. 

The project team will construct the last and most challenging section of the Stanley Street catchment network upgrade. The upgrade will mitigate future flooding risks in the area and importantly for the Britomart Train Station.

A new 270-metre inverted siphon pipeline will be installed using a three-metre in diameter micro-Tunnel Boring Machine (m-TBM). The outfall alignment will run under Quay Street behind the Ports of Auckland (POA), near Freyberg Wharf. The old stormwater culvert will also be repaired and reinstalled. Once complete, the new outfall will increase the stormwater network’s capacity and improve the resilience of downtown Auckland’s infrastructure.

This stormwater outfall upgrade will draw on McConnell Dowell’s extensive track record in marine outfall construction using trenchless methodologies.

Work on this project includes:

  • Service relocation works
  • Piling works for both the outlet and inlet shafts
  • Excavation works for both shafts
  • Tunnelling under Quay Street to a maximum depth of 20 metres
  • Chamber and outfall construction
  • Culvert strengthening

Auckland city skyline at city center and Auckland Sky Tower, the iconic landmark of Auckland, New Zealand.