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Lake Wyangan Project Dave Gilbert and Chris Green IA Conference 2014

Lake Wyangan Project Dave Gilbert and Chris Green IA Conference 2014. The Murrumbidgee Irrigation Area (MIA). Infrastructure Modernisation. Key Objectives. Improve delivery system efficiencies Meet changing customer needs Reduce asset ownership costs Generate water savings

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Lake Wyangan Project Dave Gilbert and Chris Green IA Conference 2014

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  1. Lake Wyangan ProjectDave Gilbert and Chris GreenIA Conference 2014

  2. The Murrumbidgee Irrigation Area (MIA)

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

  4. Lake Wyangan System Background • Closed system within a catchment of 7,000 ha • Irrigation supplies to 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

  5. Lake Wyangan Project Area

  6. Lake Wyangan Project 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 Wyangancatchment • Realise the estimated water savings target for the project

  7. 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 Lake Wyangan Project Options considered

  8. Lake Wyangan Modernisation Scope • Reline and widen 15.8km of ageing concrete-lined Lake View Branch Canal (122,000 sq. m of shotcrete lining) • Replace open channels and pipelines at the end of their working lives with 13.8km of GRP and PVC gravity pipelines • Replace Dethridge wheels with electromagnetic flow meters compliant with AS4747 • Automation of regulators and escape structures • Install remote monitoring of flow meters

  9. Existing Channel Lining

  10. Assessment of Existing Lining

  11. Lining Design Criteria Design Criteria Ranking Fibre reinforced shotcrete Grouted fabric mat Shotcrete over sealed liner Coletanche (geotextile) with asphalt / bitumen Shotcrete over a flexible membrane Hypalon HDPE • Convey the required flow • Construction within winter shutdown periods • Reduce seepage losses • Prevent erosion / dispersion of soil behind lining • Durability for 80 years design life • Cost-effective solution

  12. Technical Risk Reduction Shotcrete Lining Trials • Earthwork remediation and compaction • Concrete mix and curing • Unreinforced v. polymer reinforced shotcrete • Shotcrete application • Shotcrete lining over a geotextile • Panel contraction and expansion joints • Lining detail at bank top • Shotcrete surface finish

  13. Channel Re-lining

  14. Channel Re-lining

  15. Construction Schedule 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 • Automation • Acceptance testing • New system begins operation Key steps • Stakeholder forums • Individual face-to-face meetings

  16. 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

  17. Acknowledgement The Lake Wyangan Modernisation Project received Australian Government funding of $50 million through the Private Irrigation Infrastructure Operators Program in NSW

  18. Thank You for Your Attention

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