Barwon Heads Road Sedimentation Basins

Extensive earthworks exceeding 60,000m3 to establish two sedimentation basins connected by three large channels.

Scope

This project involves extensive earthworks totalling over 60,000 cubic meters, with the objective of establishing two sizable sedimentation basins interconnected via three large channels. The integration of twin-cell reinforced concrete box culverts measuring 1800mm x 2400mm each facilitates connectivity between the basins and channels, including one culvert line crossing Barwon Heads Road. To ensure continuous access on Barwon Heads Road, temporary road pavement construction was necessary.

Specific reinforced concrete foundations were required for all culverts, and reinforced concrete pavements were laid in the base of each basin. Additionally, key aspects of the project include relocating a significant 450mm water main and implementing structural foundation enhancements for an existing 600mm sewer main, both vital components of this comprehensive project. The project also involves the construction of 5600m2 of reinforced concrete basin slabs. Environment: Environmental considerations played a significant role throughout the project’s execution. Managing a high water table posed a challenge during the pouring of concrete basin slabs and culverts. To address this, herringbone subsurface drains were installed, leading to a singular well point. A 6-inch pump operated continuously, lowering the groundwater table, enabling the construction of 6000m2 of reinforced concrete slab. Similar methods were applied to overcome challenges in culvert construction.

Project Delivery

Minimal Disruption: Project delivery prioritised minimising disruption to the community and ensuring continued functionality during critical events and busy periods. Efforts were made to keep the road open for the Cadel Evans race, a significant event in the area, demonstrating adaptability in construction scheduling to accommodate the event seamlessly. Similarly, during the busy Christmas period, two lanes were re-opened to enable smooth traffic flow, even during major construction activities. Methodologies and sequencing were adjusted as necessary to fulfill these commitments, highlighting the project’s dedication to delivering with minimal disruption while aligning with community needs and events.

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