The four-kilometre alignment along the Warringah Freeway Upgrade (WFU) project in New South Wales will use a new drain application to improve the capture of water runoff.
The Transport for NSW project will use a slotted drain solution to substantially reduce flow widths along the carriageways, enabling greater sustainability and functionality outcomes.
Changes to the project will include ugrading four kilometres of the Warringah Freeway between North Sydney and Naremburn, as well improving interchanges with Falcon Street, including a new northbound on ramp at High Street.
Improved public transport links, with a continuous southbound bus lane from Miller Street to the Sydney Harbour Bridge will be included in the works as well as about 2.5 kilometres of new and upgraded cycleways and pedestrian paths, integrated with public transport networks.
CPB Contractors worked with the WFU team and TfNSW throughout the process, including the completion of a comprehensive whole-of-life cost assessment, which guided the strategic placement of each slotted drain.
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Afrida Salma, CPB Contractors, Design Engineer, said traditionally, pit and pipe systems on road infrastructure projects require pits spaced approximately 10 meters apart to capture runoff and achieve optimal drainage flow.
“In contrast, the slotted drain solution we’re using on the WFU project is almost completely continuous, which will improve water runoff capture and significantly reduce water flow within the carriageways,” said Salma.
Salma said the slotted drain solution offers notable efficiencies with the installation process requiring less excavation compared to conventional pit and pipe solutions.
“The simple reduction of excavation depths has translated to a raft of program benefits,” she said.
“When you decrease the amount of excavation work, you also shorten construction timelines, decrease noise levels, and create less disruption to traffic and surrounding areas.
“Reduced excavation and construction also means lower energy consumption and a decrease in the use of resources overall.”
For more information, https://www.transport.nsw.gov.au/
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