VEC engaged Entura to undertake the design of the pipeline, pump station and associated works. VEC and Entura worked in partnership with Tasmanian Irrigation to develop a compliant and efficient design. Important considerations during this collaborative process were safety in design, constructability and long term operational efficiency. Key features of the project are as follows:
1. Simplified pumping system
The Cottons Bridge PS was redesigned from the original concept to allow removal of the second major pump station from the scheme and to allow Cottons Bridge PS to operate for both the summer (distribution) and winter (harvesting) cycles. Through application of the pumps to both distribution modes, the scheme performance requirements have been met whilst still minimising the CAPEX and ongoing operational cost to the project and Tasmanian Irrigation.
2. Minimisation of OPEX
As part of VEC’s proposal, four alignment changes were detailed in an alternative proposal. This enabled VEC to minimise the pumping head to the Legerwood and Alberton lines, thereby reducing long term OPEX. OPEX was further reduced due to the development of the simplified pumping system as noted above.
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