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Moorabool River Seasonal Watering Proposal 2020-21

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Moorabool River Seasonal Watering Proposal 2020-21 Moorabool River Seasonal Watering Proposal 2021-22 FINAL April 2021 Contents Acknowledgement of Country ..................................................................................................... 3 Executive Summary ................................................................................................................... 4 1. Introduction ............................................................................................................................ 6 1.1 System overview ............................................................................................................... 8 2. Engagement ......................................................................................................................... 11 2.1 Notable feedback ............................................................................................................ 15 3. Values and uses of waterways ............................................................................................. 16 3.1 Aboriginal Cultural Values and uses of waterways .......................................................... 16 3.2. Social, recreational and economic values and uses of waterways ................................. 22 4. Seasonal review 2020-21 ..................................................................................................... 24 4.1 Climate ........................................................................................................................... 24 4.2 Hydrological achievement ............................................................................................... 25 4.2 Key ecological observations ............................................................................................ 32 4.4 Shared benefit review ..................................................................................................... 35 5. Environmental objectives and scope of environmental watering ........................................... 38 5.1 Water delivery objectives ................................................................................................ 38 5.2 Flow recommendations and potential watering actions ................................................... 41 6. Scenario planning ................................................................................................................. 51 6.1 Outlook for 2021-22 ........................................................................................................ 51 6.3 Scenario planning ........................................................................................................... 52 7. Delivery constraints .............................................................................................................. 56 7.1 Temporary constraints .................................................................................................... 56 7.2 Systemic constraints ....................................................................................................... 56 8. Confounding factors ............................................................................................................. 59 8.1 Fish Barriers ................................................................................................................... 59 8.2 Riparian Rehabilitation .................................................................................................... 60 9. Increasing knowledge ........................................................................................................... 61 9.1 Knowledge gaps ............................................................................................................. 61 10. Risk management .............................................................................................................. 67 10. Approval and endorsement ................................................................................................. 72 Appendix 1. Abbreviations ........................................................................................................ 73 Appendix 2. References ........................................................................................................... 74 Appendix 3. IAP2 spectrum of public participation .................................................................... 76 1 Corangamite Catchment Management Authority Moorabool River Seasonal Watering Proposal 2021-22 Appendix 4. Condition summary of the Moorabool River reaches ............................................. 77 Appendix 5. VEHW risk matrix .................................................................................................. 79 Appendix 6. Wadawurrung Traditional Owners – letter of endorsement ................................... 82 Figures Figure 1. The Moorabool River system, showing reaches 3a, 3b and 4 ...................................... 7 Figure 2. Lal Lal Reservoir ......................................................................................................... 9 Figure 3. Monthly rainfall comparison of Morrisons: 1889-2018, 2020-21 ................................. 24 Figure 4. Morrisons flow gauge data 2020-21 ........................................................................... 27 Figure 5. Batesford flow gauge data ......................................................................................... 28 Figure 6. Moorabool River flow gauges: Batesford, upstream pool and downstream pool ........ 34 Figure 7. A view from Clyde Park Vineyard, looking over the Moorabool River ......................... 35 Figure 8. Fish barriers in the Barwon system ............................................................................ 60 Figure 9. Wadawurrung Traditional Owners letter of endorsement ........................................... 82 Tables Table 1. Summary of priority watering actions for the Moorabool River in 2021-22 ..................... 5 Table 2. Stakeholder engagement for the Moorabool River SWP 2021-22 ............................... 12 Table 3. Traditional Owner values and uses ............................................................................. 18 Table 4. Social, recreational and economic shared benefits for the Moorabool River for 2021-22 ......................................................................................................................................... 22 Table 5. Environmental water program 2020-21 ...................................................................... 29 Table 6. Hydrological flow compliance for years 2002-3 to 2020-21 at Morrisons ..................... 30 Table 7. Emerging patterns in environmental watering in Victoria ............................................. 32 Table 8. Shared benefits review ............................................................................................... 37 Table 10. Potential watering actions for 2021-22 ...................................................................... 43 Table 11. Prioritisation of environmental watering under different climate scenarios ................ 53 Table 12. Potential temporary constraints to environmental water delivery ............................... 56 Table 13. Knowledge gaps in managing the Moorabool River system ...................................... 64 Table 14. Risk assessment for 2021-22 ................................................................................... 67 Table 15. IAP2 spectrum of public participation ........................................................................ 76 Table 16: VEWH risk rating matrix ............................................................................................ 79 Table 17: VEWH risk likelihood matrix ...................................................................................... 79 Table 18: VEWH risk consequence table ................................................................................. 80 Corangamite Catchment Management Authority 2 Moorabool River Seasonal Watering Proposal 2021-22 Acknowledgement of Country The Corangamite Catchment Management Authority (CCMA) wishes to acknowledge the Wadawurrung, Traditional Owners of the land of the Moorabool River. We pay our respects to their Elders past, present and emerging. We commit to continuing to work with all Traditional Owners to ensure their knowledge and culture is included and valued in CCMA planning and delivery. Corangamite Catchment Management Authority 3 Moorabool River Seasonal Watering Proposal 2021-22 Executive Summary This Seasonal Watering Proposal (SWP) outlines the CCMA’s proposed priorities for the use of environmental water in the Moorabool River system in 2021-22, as required under section 192A of the Water Act 1989. The Victorian Environmental Water Holder (VEWH) will use this SWP to inform the development of the Seasonal Watering Plan 2021-22. The Moorabool River, which passes near the towns of Ballan, Morrisons, Batesford and Fyansford, is one of the most flow-stressed rivers in Victoria. The Moorabool is very dependent on seasonal rainfall and environmental watering to maintain flows over dry periods. There are three major water storages at the headwaters of the Moorabool River: the Moorabool, Bostock, and Lal Lal Reservoirs. The Moorabool River Environmental Entitlement (2010) sits within Lal Lal reservoir and is subject to delivery rules with a maximum use of 7,500ML over three years, which effectively provides the environment with an average of 2,500ML per year, subject to inflows. This SWP has been
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