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Table 3.3.2 Potential environmental watering for the Tarago River under a range of planning scenarios
1 Environmental water requirements for tier 2 actions are additional to tier 1 requirements.
3.3 Tarago system
 Planning scenario
   Drought
   Dry
   Average
   Wet
   Expected river conditions
 • Very low streamflow
• Very low inflows
• Reduced passing flows
• Irrigation releases likely
 • Low streamflow
• Some reduction to passing flows
• Irrigation releases likely
 • Average streamflows
• Partial freshes naturally provided
 • Above-average streamflows
• Partial or full freshes naturally provided
• Irrigation releases unlikely
 Expected availability of water for the environment
   • 1,700 ML
   • 2,000–2,500 ML
   • 2,500–3,500 ML
   • 3,800–5,000 ML
   Potential environmental watering – tier 1a (high priorities)
 • One to three summer/autumn freshes
 • One to three summer/autumn freshes
• One autumn high flow (partial achievement)
 • One to five summer/ autumn freshes
• One autumn high flow (partial achievement)
• Winter/spring high flow (partial achievement)
 • One to five summer/ autumn freshes
• One autumn high flow
• Winter/spring high flow
• One to two winter/ spring freshes
 Potential environmental watering – tier 1b (high priorities with shortfall)
   • Winter/spring high flow (partial achievement)
• One autumn high (partial achievement)
   • Winter/spring high flow (partial achievement)
• One to two winter/ spring freshes
   • Winter/spring high flow
• One to two winter/ spring freshes
   • N/A
   Potential environmental watering – tier 2 (additional priorities)
 • One autumn high flow
• One to two winter/ spring high flow
• One to two winter/ spring freshes
 • One autumn high flow
• One to two winter/ spring high flows
 • One autumn high flow
 • N/A
 Possible volume of environmental water required to achieve objectives1
  • 1,000 ML (tier 1a)
• 1,000 ML (tier 1b)
• 800 ML (tier 2)
   • 1,000–1,500 ML (tier 1a)
• 1,000–1,200 ML (tier 1b)
• 400 ML (tier 2)
   • 2,000–3,000 ML (tier 1a)
• 1,500–1,800 ML (tier 1b)
• 3,000 ML (tier 2)
   • 0–3,000 ML (tier 1a)
• N/A (tier 1b)
• N/A(tier 2)
  Priority carryover requirements
  • 700–1,000 ML
     Victorian Environmental Water Holder | Seasonal Watering Plan 2020–21 | 101
 





























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