Planning scenario | Drought | Dry | Average | Wet |
Expected river conditions | - Passing flow and limited natural flow from Aberfeldy River and other tributaries contribute to low flow
- A large volume of consumptive water is released from storage
| - Passing flow and natural flow from Aberfeldy River and other tributaries contribute to low flow and some freshes
- Amoderate volume of consumptive water is released from storage
| - Passing flow and natural flow from Aberfeldy River and other tributaries contribute to low flow and periods of high flow and freshes
- A small volume of consumptive water is released from storage
| - Natural flow from Aberfeldy River and other tributaries is expected to meet most low-flow requirements, provide large freshes and sustained high flow
- Minimal volume of consumptive water released from storage
|
Expected availability of water for the environment | | | | |
Carran Carran (Thomson River) (targeting reach 3) |
Planning scenario | Drought | Dry | Average | Wet |
Potential environmental watering – tier 1 (high priorities) | Tier 1a (can be achieved with predicted supply) |
- Winter/spring/ autumn low flow (partially delivered: 300 ML/day in July 2022, 230 ML/day in June 2023 and 125 ML/day at other times)
- Spring fresh (one fresh, of lower duration and magnitude)
- Summer/autumn low flow
- Summer/autumn freshes (two freshes, one at upper, one at lower magnitude)
- Autumn freshes (two freshes, one of lower duration [in May])
| - Winter/spring/ autumn low flow (partially delivered: 300 ML/day in July 2022 and 230 ML/ day in May to June 2023 and 125 ML/ day at other times)
- Spring fresh (one fresh, of longer duration but lower magnitude)
- Summer/autumn low flow
- Summer/autumn freshes (two freshes, one at upper, one at lower magnitude)
- Autumn freshes (two freshes)
| - Winter/spring/ autumn low flow (partially delivered: 300 ML/day in July 2022 and 350 ML/d in May to June 2023 and 125 ML/day at other times)
- Spring fresh (one fresh, of longer duration but lower magnitude)
- Summer/autumn low flow
- Summer/autumn freshes (two freshes, one at upper, one at lower magnitude)
- Autumn freshes (two freshes)
| - Winter/spring/ autumn low flow (partially delivered: at 350 ML/day in July 2022 and April to June 2023 and 125 ML/day at other times)
- Spring freshes (two freshes, of longer duration but lower magnitude)
- Summer/autumn low flow
- Summer/autumn freshes (two freshes, of upper magnitude and duration)
- Autumn freshes (two freshes)
|
Tier 1b (supply deficit) |
- Winter/spring/ autumn low flow (at 350 ML/day during July to November 2022)
- Spring freshes (two freshes [one replacing tier 1a fresh],delivered of longer duration and one additional spring fresh of longer duration and lower magnitude)
- Autumn fresh (tier 1a fresh delivered of longer duration [in May])
| - Winter/spring/ autumn low flow (at upper magnitude continuously)
- Spring fresh (one additional fresh, of longer duration and lower magnitude)
| - Winter/spring/ autumn low flow (at upper magnitude continuously)
- Spring fresh (one additional fresh, of longerduration and lower magnitude)
- Summer/autumn freshes (deliver both tier 1a freshes at upper magnitude)
| - Winter/spring/ autumn low flow (at upper magnitude continuously)
- Spring fresh (one tier 1a fresh at upper magnitude)
|
Potential environmental watering – tier 2 (additional priorities) | |
Heyfield wetlands |
Potential environmental watering – tier 1 (high priorities) | Tier 1a (can be achieved with predicted supply) |
- Fill (in August)
- Top-ups (two, in September-December)
- Partial drawdown (during December to February)
|
Tier 1b (supply deficit) |
|
Potential environmental watering – tier 2 (additional priorities) | |
Possible volume of water for the environment required to achieve objectives | - 21,000 ML (tier 1a)
- 22,500 (tier 1b)
| - 26,000 ML (tier 1a)
- 25,700 ML (tier 1b)
| - 33,400 ML (tier 1a)
- 21,200 ML (tier 1b)
| - 43,500 ML1 (tier 1a)
- 14,600 ML (tier 1b)
|
Priority carryover requirements for 2023-24 | |