The project included laying 4.2 km of wastewater pipes and 650 m of stormwater pipes in dense urban areas, connecting more than 200 properties, and the construction of 140 maintenance manholes, as well as repair to vent shafts.
Full completion of this project was achieved in March 2020.
The project was extremely high-impact as a result of the densely populated location, as it affected more than 30,000 customers in Woolloomooloo, Potts Point, and Darlinghurst areas.
The location challenges led the team to adopt advanced technology, such as prefabricated manholes, reducing installation times from 21 days to 3-5 days.
State of the art trenchless construction techniques such as bed bored, stitch boring, and microtunnelling were deployed, reducing noise impacts and minimising the impact on the environment.
The now-improved system can capture and transfer wet weather wastewater overflow in the Woolloomooloo catchment into the Bondi treatment plant.
It has also eliminated wafted odours during the dry weather, which were a main cause of complaint in the community.
The new separated system improves the liveability of the area, minimises the contamination of the Sydney Harbour and Bay, enhances its water quality, and improves marine life.
Sydney Water took an integrated team approach, taking on GHD to lead planning and design, and Diona Civil Engineering for the construction stages.
Pezzimenti and UEA Australia were responsible for the trenchless pipe installation and technology, and Rocla supplied the prefabricated manholes.
For more information visit the Sydney Water website.