Page 109 - VEWH Seasonal Watering Plan 2020-21
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Table 3.4.2 Potential environmental watering for the Maribyrnong system under a range of planning scenarios
3.4 Maribyrnong system
 Planning scenario
    Drought
  Dry
    Average
  Wet
  Expected river conditions
  • Unregulated flows unlikely
• Passing flows ceased
• Some baseflow from groundwater contributions in lower Jacksons Creek
 • Low volumes of unregulated flows
• Passing flows may meet some low-flow objectives
• Some baseflow from groundwater contributions in lower Jacksons Creek
   • Unregulated flows meet some objectives
• Passing flows may meet several low- flow objectives
• Groundwater contributions provide baseflow in lower Jacksons Creek
  • Unregulated flows meet most objectives
• Passing flows may meet most low-flow objectives
• Groundwater contributions provide baseflow in lower Jacksons Creek
  Potential environmental watering – tier 1a (high priorities)
  • Due to a lack of formal environmental entitlement, the Maribyrnong system will not receive
an environmental allocation in 2020–21 and therefore no tier 1a watering actions have been identified. Water will need to be purchased from willing sellers to support tier 1b or tier 2 watering actions
 Potential environmental watering – tier 1b (high priorities with shortfall)
 • Summer/autumn low flows
• Two summer/ autumn freshes
 • Three summer/ autumn freshes
 • Three summer/ autumn freshes
• Winter/spring low flows (up to 14 days)
  • Two summer/ autumn freshes
• Winter/spring low flows (up to 21 days)
 Potential environmental watering – tier 2 (additional priorities)
 • Two summer/ autumn freshes
 • Two summer/ autumn freshes
 • Two summer/ autumn freshes
• Increased duration winter/spring low flows
  • Two summer/ autumn freshes
• Increased duration winter/spring low flows
 Possible volume of environmental water required to achieve objectives1
  • 300 ML (tier 1b)
• 200 ML (tier 2)
  • 300 ML (tier 1b)
• 200 ML (tier 2)
  • 600 ML (tier 1b)
• 200 ML (tier 2)
   • 600 ML (tier 1b)
• 200 ML (tier 2)
  1 Environmental water requirements for tier 2 actions are additional to tier 1 requirements.
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