Account Adjustment: Sum of Account adjustment (exclude spill adjustment). Post Exit Phase. An example is to use an adjustment trigger to subtract evaporation loss from account.
Account Balance: Balance of an account to keep track of water available for use or trade. This account records allocation made against entitlements throughout a water year, as well as water trades and use.
Account Balance = account balance from end of previous time step + increased allocation - usage -adjustment by triggers
Available Water: Sum of available water in allocation account balance and carry over account balance. Each account has two account balance, one is to record allocation balance, the other is to record allocated carryover water balance which is carried over from last water season. Not all the water in these two account balance are available for use, some water can be reserved for special purpose, such as spilling. Only available component can be used by water user.
If "Water Available While Spillable" is enabled,
Available water = Account balance + Carryover Water; which means all water in these two account balance are available for use
Otherwise,
Available water = Account balance + Carryover Water - spillable Water; which means some water (spillable water component) are reserved and not available for use
Available Water in Account Balance: This is water that can be used in allocation account balance (exclude non available spillable water).
Available Water in Carryover: This is water that can be used in carryover account balance (exclude non available spillable water).
Carryover: Balance of an carryover account to keep track of carry over water available for use or trade. Carryover is an arrangement that allows a water entitlement holder to take unused water allocations from previous water year into a new water year to use or trade
carryover = carryover balance from end of previous time step - usage - spill reduction - adjustment by triggers
Carryover Allocated： This is the water carried over from last water year and is allocated to water user in current new water year.
Carryover Next Year Trigger Total/Addition to Carryover End of Water Year: Water that can be carried over from allocation account balance to next water year at the end of current water year. It does not include water that has already stayed in carryover account.
Carryover Scalar: This is used to reduce carryover commitment. The product of the carryover scalar and carryover start of water year is the carryover commitment at the start of the model run for the account. The carryover scalar is reset to 0 at the beginning of each water year, and increased as resources allow the commitment to be met (in accordance with the ARA table).
Carryover Start of Water Year: Total amount of water carried over from previous water year to start of current new water year
Change in Allocation: Difference in allocation volume for current time step compared to last time step. Allocation level may change after each reassessment.
Change in Allocation Percent : Difference in allocation percentage for current time step compared to last time step.
Change in Allocation Percent = ( Change in Allocation / Entitlement )*100%
Effective Allocation: This is total amount (in percentage of entitlement )of water that is actually available to use or trade in a water year, including new allocations and carryover.
Effective Allocation = min (maximum effective allocation, (carryover start of water year + allocation - spill reduction water year) / Entitlement)
Max WDD: Maximum amount of without debit diversion. Non-debit accounting are designed for particular river systems (Murray, Murrumbidgee, Babubula and Upper Namoi) in New South Wales. Different river system has different rules for water diversion under no- debit accounting. For more details, please go to annual accounting SRG.
Number of Shares: A right to take/use/extract/have water delivered over a water year.
Off Allocation Usage Today: Off allocation water used for current time step. Off allocation water, also called "Supplementary water" is effectively surplus flow that cannot be captured (regulated) into storages. When storm events result in flow that cannot be captured in storage structure such as dams or weirs for future use, and the water is not needed to meet current demand or commitments, then it is considered surplus to requirements.Supplementary flow events can occur in any regulated system at any time and therefore access is purely opportunistic. They can be triggered overnight and last for a day or two, a month or six months or more, depending on the river system and nature of the flow event.
Off Allocation Usage Water Year: Accumulative off allocation water usage from start of water year to current time step
Order/Use Debit: Water debited from accounts for current time-step. There are two debit types available for an account type: Order debit and Use debit. The difference of order debit and use debit is debit time and recredit . For order debit, water is debited from an account the moment water requirement passed up (could before extraction if there is travel time in upstream reaches) and if there is insufficient water available when actual extraction happens, the shortfall will recredit to the account. For use debit, water is debited from an account when actual extraction happens and only the actual extracted volume is debited from account, so no recredit is needed.
Spill Reduction: Spill deducted from spillable water accounts for current time step. Spill happens when water is discharged from a storage when there is more water in supply than demand for water. When water is spilling from a dam, spillable water account should have the same amount of water deducted.
Spill reduction water year: Accumulative spill reduction from start of water year to current time step
Spillable water: Any carryover or allocations above water share volume. It keeps track of any water that can be lost if the dam spills. Spillable water can not be used or traded until it is recognized as low risk of spill and spillable water will then become available.
There are two different rules for calculation of Spillable water:
- Total water - 100%: The calculation is made based on the state of the Water Available While Spillable checkbox:
- If enabled, Spillable water = max(0, Total allocation water year + Carryover start of water year − 100% entitlement − Total spill reduction water year − Total usage from carryover water year); or
- If disabled, Spillable water = max(0, Total allocation water year + Carryover start of water year − 100% entitlement − Total spill reduction water year). In this case, spillable water increases with allocation.
- Carryover - Use: In this case, Spillable water = Carryover start of water year − Total usage carryover water year − Total spill reduction water year.
Total Account Adjustment Water Year: Accumulative accounts adjustment from start of water year to current time step
Total Allocation Water Year: Total amount of water that has been allocated to an account in a water year. The allocation is made again entitlements throughout a water year.
Total Commitment:
Total Usage Carryover Water Year: Accumulative usage from carryover accounts from start of water year to current time step
Total Usage From All Paths Water Year: Usage of water from all different sources, including normal allocation, carryover water, off allocation water and water that has been lost on the way to extraction point.
Total Usage From All Paths Water Year = Total Usage Water Year + Off Allocation Usage Water Year + Total Distribution Loss Water Year
Total Usage Water Year: Accumulative usage from both allocation accounts and carryover accounts from start of water year to current time step
Total Water accounts: Sum of remaining water from all accounts from start of water year to current time step
Transferred Water Use: Water usage that has been transferred to different account/account type.
Truncated CarryOver: carryover that has been truncated due to total amount of allocation and carryover goes beyond the maximum effective allocation cap
Truncated carryover =min ( carryover balance, max ( 0, allocation + carryover - maximum effective allocation cap) )
WDDRepaid
WDD Usage