Page 53 - VEWH Seasonal Watering Plan 2020-21
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Table 2.2.2 Potential environmental watering for the Latrobe River under a range of planning scenarios
2.2. Latrobe system
  Planning scenario
   Drought
   Dry
   Average
   Wet
   Expected river conditions
 • Small contributions from unregulated reaches and tributaries of the Latrobe River with little opportunity for freshes to occur naturally
• Consumptive demand from Blue Rock Reservoir will be very high and regular releases
to the Tanjil River will contribute substantially to low flows
 • There will be some natural flow that contributes to low flows and freshes
• Consumptive demand from Blue Rock Reservoir will be high and contribute to low flows
 • Natural flow will provide low flow throughout the year, and multiple freshes (most likely in winter/ spring)
• Some spills are likely and there
will be releases for consumptive users which will partly contribute to low flows
 • Natural flow will provide strong low flow throughout the year
• Multiple spills from Blue Rock Reservoir will provide extended durations of freshes, high flows and overbank flows
• No significant releases from consumptive entitlements in Blue Rock Reservoir are likely
 Expected availability of water for the environment
   • 15,000 ML
   • 17,000 ML
   • 22,000 ML
   • 30,000 ML
   Potential environmental watering – tier 1a (high priorities)
 • Summer/autumn low flow (delivered in February to March)
• Three summer/ autumn river freshes (no extended freshes)
 • Two summer/autumn river freshes
• One summer/autumn estuary fresh (or
river fresh if estuary freshening not required)
 • One summer/autumn river fresh
• Three summer/ autumn estuary freshes (or river freshes if estuary freshening not required)
 • One summer/autumn river fresh
• Three summer/ autumn estuary freshes (or river freshes if estuary freshening not required)
• Two winter/spring freshes
 Potential environmental watering – tier 1b (high priorities with shortfall)
  • Summer/autumn low flow delivered continuously
• One summer/autumn estuary fresh
  • One additional summer/autumn estuary fresh
  • One winter/spring fresh
  • N/A
 Potential environmental watering – tier 2 (additional priorities)
  • Winter/spring low flow (deliver for one month)1
  • One winter/spring fresh
• Winter/spring low flow (deliver for one month)
  • N/A
  • N/A
 Possible volume of environmental water required to achieve objectives2
  • 12,800 ML (tier 1a)
• 16,300 ML (tier 1b)
• 9,000 ML (tier 2)
   • 13,200 ML (tier 1a)
• 7,200 ML (tier 1b)
• 15,400 ML (tier 2)
   • 7,400–15,200 ML (tier 1a)
• 8,900 ML (tier 1b)
   • 15,000–21,600 ML (tier 1a)
  Priority carryover requirements
  • N/A3
  1 As low flows over winter and spring have a demand of 6,200–9,000 ML per month, only one month of continuous flow will likely be feasible.
2 Environmental water requirements for tier 2 actions are additional to tier 1 requirements.
3 There are no carryover provisions in the Blue Rock environmental entitlement.
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