Planning scenario | Drought | Dry | Average | Wet |
Expected river conditions | - Negligible contributions from unregulated reaches and tributaries of the Loddon River,consumptive water deliveries in the irrigation season (and none in reach 4)
- Reduced passing flows in autumn/ winter are possible
| - Small inflows from unregulated reaches and tributaries of the Loddon River contributing to low flow, consumptive water deliveries in the irrigation season (but not in reach 4)
| - Natural flow will provide low flow and multiple freshes, most likely in winter/spring
- Consumptive water deliveries in the irrigation season (but not in reach 4)
- No spill is likely
| - Spills from Loddon system storages will provide extended-duration high flow, and overbank flow is most likely in late winter/spring
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Expected availability of water for the environment1 | | | | |
Loddon River (targeting reach 4) |
Potential environmental watering – tier 1 (high priorities) | Tier 1a (can be achieved with predicted supply) |
- Winter/spring low flow (delivered at 25-50 ML/day3)
- Winter/spring high flow (one high flow, delivered at a lower duration)4
- Summer/autumn low flow (delivered at 25-40 ML/day)5
- Summer/autumn freshes (three freshes)
- Year-round fresh (trigger-based)
- Winter/spring low flow (delivered at 50-77 ML/day)
| - Winter/spring high flow (one high flow, delivered at a lower duration)
- Summer/autumn low flow (delivered at 40 ML/day)
- Summer/autumn freshes (three freshes)
- Year-round fresh (trigger-based)
- Winter/spring low flow (delivered at 77-100 ML/day)
| - Winter/spring high flow (one high flow)
- Summer/autumn low flow (delivered at 50 ML/day)
- Summer/autumn freshes (three freshes)
- Year-round fresh (trigger-based)
- Winter/spring low flow (delivered at 77-100 ML/day)
| - Winter/spring high flow (one high flow)
- Summer/autumn low flow (delivered at 50 ML/day)
- Summer/autumn freshes (three freshes)
- Autumn high flow (one high flow)
- Year-round fresh (trigger-based)
|
Tier 1b (supply deficit) |
- Summer/autumn low flow (delivered at 40-50 ML/day)
| - Winter/spring low flow (delivered at 77-100 ML/day)
- Summer/autumn low flow (delivered at 40-50 ML/day)
| - Autumn high flow (one high flow)
| |
Potential environmental watering – tier 2 (additional priorities) | - Winter/spring low flow delivered at 50-100 ML/day magnitude
- Summer/autumn low flow trial (50- 100 ML/day)
- Autumn high flow (one high flow)
| - Summer/autumn low flow trial (50- 100 ML/day)
- Autumn high flow (one high flow)
| - Summer/autumn low flow trial (50- 100 ML/day)
| - Winter/spring low flow trial (100- 200 ML/day)
- Summer/autumn low flow trial (50- 100 ML/day)
|
Possible volume of water for the environment required to achieve objectives | - 5,000-9,300 ML(tier 1a)
- 600 ML (tier 1b)
- 12,200 ML (tier 2)
| - 9,300 ML (tier 1a)
- 4,000 ML (tier 1b)
- 8,800 ML (tier 2)
| - 8,200 ML (tier 1a)
- 3,500 ML (tier 1b)
- 4,300 ML (tier 2)
| - 8,400 ML (tier 1a)
- 3,000 ML (tier 2)
|
Pyramid Creek and Loddon River (targeting reach 5) |
Potential environmental watering – tier 1 (high priorities) | Tier 1a (can be achieved with predicted supply) |
- Year-round low flow
- Winter/spring high flow (one high flow)
| - Year-round low flow
- Winter/spring high flow (one high flow)
- Autumn high flow (one high flow)
|
Tier 1b (supply deficit) |
|
Potential environmental watering – tier 2 (additional priorities) | - Autumn high flow (one high flow)
| |
Possible volume of water for the environment required to achieve objectives6 | - 4, 000 ML (tier 1a)
- 2,000 ML (tier 2)
| |
Serpentine Creek (targeting reach 1)7 |
Potential environmental watering – tier 1 (high priorities) | Tier 1a (can be achieved with predicted supply) |
- Winter/spring low flow (delivered at 10 ML/day)
- Winter/spring fresh (one fresh,delivered at 40 ML/ day)
- Summer/autumn low flow (delivered at 10 ML/day)
- Summer/autumn freshes (three freshes)
| - Winter/spring low flow (delivered at 10 ML/day)
- Winter/spring fresh (one fresh)
- Summer/autumn low flow (delivered at 10 ML/day)
- Summer/autumn freshes (three freshes)
| - Winter/spring low flow (delivered at 10 ML/day)
- Winter/spring fresh (one fresh)
- Summer/autumn low flow (delivered at 10 ML/day)
- Summer/autumn freshes (three freshes)
| - Winter/spring low flow (delivered at 10 ML/day)
- Winter/spring fresh (one fresh)
- Summer/autumn low flow
- Summer/autumn freshes (three freshes)
|
Tier 1b (supply deficit) |
- Winter/spring fresh (tier 1a fresh delivered at 120 ML/day)
- Summer/autumn low flow (delivered at 10-20 ML/day)
- Winter/spring low flow (delivered at 10-20 ML/day)
| - Winter/spring low flow (delivered at 10-20 ML/day)
- Summer/autumn low flow (delivered at 10-20 ML/day)
| - Winter/spring low flow (delivered at 10-30 ML/day)
- Summer/autumn low flow (delivered at 10-20 ML/day)
| - Winter/spring low flow (delivered at 10-30 ML/day)
|
Potential environmental watering – tier 2 (additional priorities) | | | | |
Possible volume of water for the environment required to achieve objectives | - 1,430 ML (tier 1a)
- 3,700 ML (tier 1b)
| - 1,430 ML (tier 1a)
- 2,500 ML (tier 1b)
| - 1,300 ML (tier 1a)
- 3,200 ML (tier 1b)
| - 1,160 ML (tier 1a)
- 2,000 ML (tier 1b)
|
Priority carryover requirements for 2023-24 | - 4,400 ML for early- season low flow and winter/spring high flow
| - 4,000 ML for early-season low flow and winter/spring high flow
|