Rocla is supplying a wide range of precast drainage products for the upgrade of a major connecting road in Sydney’s west, including large box culverts, pipes, stormwater treatment and spill containment tanks.
The NSW Roads and Traffic Authority is upgrading Cowpasture Road from two lanes to four lanes with central medians between the Westlink M7 motorway and North Liverpool Road. The $65 million project includes flood relief culverts to alleviate flooding from Hinchinbrook Creek.
Rocla supplied precast box culverts for three culvert crossings. The flexibility offered by the range of Rocla® box culverts provided for a variety of spans and leg heights to speed construction and accommodate the different flow capacity, depth to invert and allowable crossing configurations.
The use of 4200mm span box culverts maximised waterway area and minimised the number of handling movements.
The drainage system also had to provide for routine road runoff treatment and the rare event of a catastrophic oil spill. Two spill containment systems were installed that included pre-treatment, storage and flow control. ecoRainPlus® tanks with ecoStop® flow controls provided an oil detention system, while CDS®Units were designed into the system to protect against gross pollutants, sediments and routine hydrocarbons.
Work on the northbound side of the road from Westlink M7 motorway to Green Valley Rd will be completed by January, when work will begin on the southbound section.