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Irrigation Modernisation – The Lake Wyangan Project

Irrigation Modernisation – The Lake Wyangan Project. The Murrumbidgee Irrigation Area (MIA). Infrastructure Modernisation Planning. Characterised infrastructure into zones Cost of operating and maintaining infrastructure Revenue generated by customer charges

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Irrigation Modernisation – The Lake Wyangan Project

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  1. Irrigation Modernisation – The Lake Wyangan Project

  2. The Murrumbidgee Irrigation Area (MIA)

  3. Infrastructure Modernisation Planning • Characterised infrastructure into zones • Cost of operating and maintaining infrastructure • Revenue generated by customer charges • Volume of average annual water losses • Ability to meet all necessary contract and legal obligations • Agronomic potential of soils • Environment value of surrounding area • Land use changes/land use zones

  4. Infrastructure Modernisation • Improve system efficiencies • Meet changing customer needs • Reduce asset ownership costs • Generate water savings • Reduce infrastructure footprint

  5. Infrastructure Modernisation Strategy • Replace lined channels with gravity pipes • Replace Dethridge Wheels with compliant flow meters • Automate flow control structures • Support on-farm water efficiency improvements • Application for Australian Government funding under the Water for the Future initiative

  6. Alliance Delivery Model • Used successfully on infrastructure projects • Enables early commencement of the modernisation program • Provides for constructor input during the design phases • Strong likelihood of achieving outstanding performance • Ensures high standards of work • Provides opportunities for local firms • Maximises likelihood of mitigating time/cost overruns • Maximises the potential for staff development

  7. Lake Wyangan System Background • Closed system within a catchment of 7,000 ha • Supplying around 200 properties • Ageing concrete-lined gravity supply channels • Constrained system limited to 220 ML/day • Mix of hobby blocks, horticulture and large area • Social amenity provided by Lake Wyangan

  8. Lake Wyangan Modernisation Objectives • Replace ageing infrastructure that is at risk of failure • Enable delivery of contracted levels of service • Minimise the impact on water levels and water quality and the overall environmental health of the Lake Wyangan catchment • Realise the estimated water savings target for the project

  9. Upgrade the existing supply system Focus on renewal of ageing assets over water savings Reconfigure the existing system Focus on providing a secondary supply system for some areas to address capacity constraints Build new assets to alleviate requirement to upgrade some capacity constraints Focus on creating new asset over renewal of existing assets Planning Options Options considered

  10. Lake Wyangan Modernisation Scope • Reline and widen 15.8km of ageing concrete-lined channel • Replace 122,000 sqm of concrete lining • Replace open channels and ageing pipelines with 13.8km gravity pipelines • Replace Dethridge wheels with flow meters compliant with Australian Standard AS4747 • Install channel automation of flow control structures • Install remote monitoring of meters

  11. Technical Risk Reduction Shotcrete Lining Trials • Earthwork remediation and compaction • Concrete mix • Shotcrete application • Panel jointing materials • Shotcrete finish

  12. Construction program • Construction will commence in May 2013 • All works to be completed by November 2014 • Pipeline and channel works have been designed to minimise supply disruptions. • Customers notified in advance of periods when the supply system will be unavailable • Priority for construction is: • Supply and installation of gravity pipe lines • Channel re-lining and earthworks • Meter replacements • Channel automation

  13. Construction Program

  14. Customer Engagement Building relationships Planning and design Testing/ Commissioning Construction Oct 2011– ongoing Oct 2011 – May 2013 May 2013 –Nov 2014 Nov 2013/Nov 2014 Timing • Planning options • Survey and detailed design • Outlet designs • Construction: • Civil • Mechanical • Electrical • Acceptance testing • New system begins operation Key steps • Stakeholder forums • Individual face-to-face meetings

  15. Lake Wyangan Modernisation Challenges • Forecasting future customer behaviour and intentions • Managing customer expectations • Developing and adopting new design rules • Establishing new business processes • Anticipating changes to operating practices • Compressed construction window • Delivering a successful project for MI, customers and the region

  16. Acknowledgement The Lake Wyangan Modernisation Project received funding of $50 million from the Australian Government’s Water for the Future initiative through the Private Irrigation Infrastructure Operators Program in NSW

  17. END

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