OSBORNE PARK DRAINAGE UPGRADES

Georgiou has delivered the Osborne Park Drainage Upgrades for repeat client, Water Corporation.

Valued at $10.6 million, the project was delivered in two stages and involved the upgrade to the drainage infrastructure in Osborne Park and surrounding areas.

Stage One

Stage One of the project was delivered in late 2020 and, as a result, the project has increased water capacity and minimised potential flooding.

The drainage culvert under Pearson Street was replaced and sections of the open drain running along Stephenson Avenue to Herdsman Lake were cleared out and re-lined. The team worked over a 24-hour period to replace the culvert.

The scope of works included:

• dredging, regrading and widening approximately 300-metres downstream of the existing Pearson Street open drain, including placement, installation of rock pitching, new headwall construction and removal of existing DN1500 piped culvert;
• upgrading of the existing culvert through Pearson Street, including installation of  six new DN1200 RCP culverts;
• regrading and upgrading of the drain from Pearson St at the downstream side of the proposed Scarborough Beach Rd culverts, including rock protection placement and erosion control matting.

The team overcame traffic management constraints and a tight working area to deliver the project. To improve the performance and lifecycle of the drain, the team applied extensive rock-pitching and erosion control matting to the base and sides of the drain.

Stage Two

Georgiou was awarded the contract for the Osborne Park Drainage Upgrades Stage Two in early 2021, following the successful delivery of Stage One in 2020.

The upgrade work involved installing a new culvert, a structure that allows water to run under a road, under Scarborough Beach Road between Ellen Stirling Boulevard and Stephenson Avenue. A new section of the drain was also constructed to join this new culvert to the existing drain network.

Works were completed in early-2022.