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Harvey Dam Forward Works
Client | Water Corporation 
Location | Harvey, Southwest Western Australia
Start Date | November 1999
End Date | April 2000
Value | $32M
Forward Works were undertaken in an alliance contract with the Water Corporation, known as the Stirling Alliance. The project was identified as suitable for this type of arrangement due to the degree of difficulty of the works and environmental constraints.
Works included:
- 19.45km of 1400 diameter steel underground pipe of the Stirling Trunk Main
- Realignment of 7km of Harvey Quindanning Road including four causeways spanning 1.43km and comprising 320,000m3 of fill
- Outlet pipeworks and inlet tower at Stirling Dam
- 3.5km of 300mm PVC pipeline from Stirling Main Trunk to Harvey town water supply
The pipeline involved the installation of 1400mm diameter underground pipeline through a variety of terrain, some of it steeply sloping and heavily wooded. Because of the area’s environmental sensitivity, the installation crews had to operate in a clearance corridor that was only 9m wide through one of the more sensitive river valley sections.
The reconstruction of the Harvey-Quindanning Road, including construction of four large causeways, was needed to avoid low-lying road sections that would ultimately be inundated by the Harvey irrigation dam. The work, requiring massive amounts of cut and fill, had to be carried out without interfering with the hundreds of truck and trailer movements hauling material and pipes to the pipeline, as well as busy local traffic.
The project was recognised for its achievements in environmental performance winning:
- CASE Earth Award – National Winner, $2-$10M Category Projects 1998
- CASE Earth Award – National Winner, Over $10M Category 2000, Stirling Alliance – Stirling to Harvey Pipe and Roads Project
- CASE Earth Award – Overall National Winner 2000, Stirling Alliance – Stirling to Harvey Pipe and Roads Project
- Engineering Excellence Award, Environment Category 2000, Stirling Alliance – Stirling to Harvey Pipe and Roads Project