Nepean Dam Transfer Pipeline
Construction of 2 kilometres of water transfer pipeline.
The Nepean Dam Transfer Water Pipeline provided Diona with a range of challenging issues. Located in the upper Wollongong area (100 kilometres South West of Sydney), two of the regions four major dams required a connecting pipeline to enable the transfer of water during the drought season to maximise water storage.
Nepean Dam is one of the upper Wollongong region’s 4 major dams. It has the largest catchment area, yet the smallest possible storage space. As a consequence, the dam overflows consistently during the rainy season. Diona has been contracted by Baulderstone and Hornibrook to construct the essential connecting pipeline between Avon Dam and Nepean Dam. This will allow the transfer of overflow water and will maintain extra storage space available in Nepean Dam to boost water stores.
During the tender process, a key delivery concern for Diona was the access track along the pipeline route. The proposed pipeline design was situated along a narrow dirt track, resulting in one way in and one way out. Clearing of surrounding vegetation was prohibited under environmental management systems, with the exception to a number of overtaking bays. A section of the pipeline was located in a position with no suitable access for the excavator, with the only access route along a rock ledge 2.5 metre wide. As a result, materials and equipment handling became a key factor to ensure the pipeline was constructed to the timeline set out in the tender.
Baulderstone and Hornibrook
December 2005 - June 2006