Modifications to Pipe Clay and Slaney Creek Weirs
The upgrade to Pipe Clay and Slaney Creek Weirs was designed to improve the operation of the weirs to help facilitate more frequent operations.
To upgrade the Pipe Clay Creek Regulator York Civil installed upstream sheet piles and a downstream earth bund cofferdam in order to undertake the demolition and replacement of the concrete apron. As well as this remediation work, three hydraulically powered vertical lift gates were installed to allow safe regulation of water through the weir structure.
For the Slaney Creek Weir, upstream steel sheet piles and a downstream earth bund cofferdam were constructed. Four 305mm diameter HDPE pipes were installed to bypass flows over the downstream cofferdam.
As access to the Slaney site was limited to boat only, it was logistically challenging to coordinate resources, plant and materials. Detailed planning and forecasting was undertaken to confirm that this logistical challenge could be overcome, through the use of barges to transport plant and equipment across the river.