Frequent Asked Questions
Carryover is the ability to make use of spare capacity in Hume Dam to store unused water from one season for use in the next. Carryover is the first water lost if there is a spill from Victoria’s share of Hume.
To carryover you must have a Water Share linked to your ABA, otherwise all water in the ABA at the end of the season will be forfeited. Carryover is automatic at the end of the season unless you request otherwise (Form 41).
You can carry over up to the volume of Water Shares attached to your ABA.
Water carried over is available from July 1.
Yes, carryover water is no different to any other water in your ABA and can be used or traded.
A spillable account is a special sub-section of your ABA which water cannot be used or traded from. Once the total volume of carryover and allocations made against a Water Share equals it’s volume any additional allocations are made into the spillable account.
Water in your spillable account cannot be traded or used. If there is a spill from Victoria’s share of Hume Dam then all spillable accounts will have a percentage of the water in them forfeited. This may continue until all of the water is lost if water continues to spill.
Once the risk of Victoria’s share of Hume spilling is less than 10 % a Low Risk of Spill declaration is made and the remaining water in spillable accounts is returned to your ABA. It can then be used or traded as normal.
There is no charge to carry over, but there is an Above Entitlement Storage charge on all water returned to your ABA from your spillable account. This charge was $4.13 / ML in 2018/19.
You are not charged for any water lost to spill, only that returned once a Low Risk of Spill declaration is made.
The principle behind carryover is that it does not impact on allocations, so it is the first water to be lost in the event of a spill.
The more you carry over the more likely you are to have water put in to your spillable account where it is at risk of spilling. If you carry over 50 % of your Water Share volume then once allocations reach 50 % any future allocations will go in to your spillable account, however if you only carry over 10 % of your Water Share volume then it isn’t until allocations reach 90 % than future allocations become at risk of spill.
Until a Low Risk of Spill declaration is made water in spillable accounts can be lost. This may not happen until quite late in the season. Spills are due to inflows, and it may not be a physical spill from the dam which causes loss as it may be caused by a spill from Victoria’s share of Hume Dam to NSW’s.