Project Description


Waterfall by Crown is Waterloo’s latest luxury residential development, a sophisticated collection of four buildings delivered by award-winning developers, Crown Group. Located in Waterloo, the development sits just 4km from the Sydney CBD in an increasingly dense urban setting. The site, once a network of swamps, wetlands and creeks, now blends a futuristic vision for a new way of living with inspired architecture and the enviable Australian lifestyle. Hazardous flooding has been a constant challenge, with floodwaters reaching 2.3m in Joynton Ave during the 2015 storms – so for the principal and developer as well as the local authorities, it was key that the required stormwater drain could withstand an inundation of heavy rainfall. Rob Carr was all too familiar with the local ground condition and flooding issues, having completed award-winning microtunnelling services for the local Green Square Stormwater Drain project.

In response to Crown’s challenge to build a large stormwater road crossing and transition structure, Rob Carr came up with a viable alternative solution to avoid a myriad of underground services and keep Waterloo’s O’Dea Avenue continuously operational. With services lying up to 0.45m below ground and up to 0.3m above the to-be constructed stormwater transition pit, which would also receive the microtunnelling machine, Rob Carr constructed the culvert by optioneering the design to suit the client’s needs. Seven parallel 820mm OD tunnels 350mm apart – at a clearance of no more than 80mm between services – were bored to exact tolerances below a myriad of services to connect two transition pits for the stormwater drain beneath the development. The project was delivered on budget, two months ahead of time and with no interruption to existing services, which included the main fibre optic cable to the USA and numerous power, gas, telco services. Rob Carr was integral in overcoming the challenges presented by the ‘spaghetti’ of services to deliver the project without issue.

Crown Group

Waterloo, NSW

Type of contract:
Design & Construct

Value Range:
< $2 million

Construction period:
Aug 2018 – Dec 2018

Parallel Tunnels
Incident working in tight urban corridor
Months Ahead of Schedule





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Do you have a project?

Rob Carr operates throughout
Australia and New Zealand…

…through multiple offices in
Sydney, Brisbane, Perth and Auckland.

Contact us

You have a project?

Rob Carr widely operates in
Australia and New-Zealand…

…through multiple offices in
Sydney, Brisbane, Perth and Auckland.


Contact us