Northside Storage Tunnel - Sydney, Australia (1998 - 2000)

The Northside Storage Tunnel was built in Sydney, Australia (1998-2000) from the suburb of Lane Cove (Western Sydney) to North Head. The total tunnel length was in excess of 20km, with diameters from 3.8 meters to 6.6 meters, a total excavation of 750,000m3 of ground and a project cost of USD 400 million.

The tunnel was commissioned to collect storm overflow from the sewerage system to reduce contamination from raw sewage entering Sydney's iconic harbor.

Due to the potentially corrosive nature of the chemicals present in the storm-water and sewage overflow, it was determined that stainless steel reinforcement could not offer the required life-span and that more corrosion resistant materials would be required.

Pultron worked in conjunction with tunnel design engineers to develop specialised tunnel reinforcement rock-bolts based on MateenBar which fulfilled the required mechanical properties and offered the extreme corrosion resistance required for this difficult application.

Project Notes


Project value
USD 400 million

Connell Wagner

MWH, Transfield

Sydney Water

Download North side storage tunnel - design
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