Carryover is an entitlement based mechanism to allow unused water to be carried over for use in the following water year. It can help in long term water security by providing added flexibility and assist water planning for the next water year. It can be made up of unused water allocations along with purchased temporary water. Rules are determined by the type of water entitlement you hold. To find out more about Carryover, read the Learn more about Carryover section.
However, if your Water Entitlement doesn’t allow for Carryover or if you are looking for a lower risk Carryover option, we can assist by finding appropriate entitlement holders who will carry the water over into the new water year before returning it back to you. Also, if your Water Entitlement allows the capacity to carry over and you are not maximising this feature, we can match a placer who is looking to secure their water needs for the following water year.
Learn more about carryover and what it means
When to use Carryover?
Carryover can be used when you may not get enough water allocations in the next water season (dry to extremely dry conditions) to get your crop off to a good start or finish. For example, you could decide to use carryover if the weather turns wet and you want to carry over your unused water into the next season, as long as it does not impact your following season water allocations. As a general guideline, if the outlook for allocations is lower, then it is more important to consider using carryover.
What is a holder and placer?
A Holder is the party who is offering the facility of carryover
A Placer is the party who has allocation which they wish to place with the holder for the purpose of carrying that water over into the following water year
What is the risk of a spill?
Having an understanding of the risk of low allocations, and an understanding of the way carryover works, the next thing to understand is the risk of a spill. Risk of a spill is when water spills over if dams fill up and storage space is needed for inflows to support allocations. When the dam spills, some of the spillable water is lost to make way for new allocations to all water shares. This water is recorded in your allocation account as spillable water to keep track of your carryover and allocation stored above 100 per cent of your water entitlement. You will only lose water if the dams spill to make room for inflows for new allocations.
With a spill, there is no guarantee of access to water above your full entitlement, you only have the security of access to water up the full volume of your water share(s). You cannot use or trade your spillable water until a low risk of spill declaration is made by the water authority in your state. The greater the volume you carryover as a percentage of your water share volume, the more exposed you are to the risk of a spill. Water carried over against high-reliability water shares is more exposed to the risk of the spill than water carried over against low-reliability water shares.
How can I calculate my carryover?
You can use the carryover calculator to test scenarios and get a better understanding of how carryover and spillable water will work in your situation.
Learn about carryover examples by reading our Carryover Fact Sheet showing different scenarios for entitlement types and the associated risks with each.
Is carryover available in my state?
Carryover is not available on all licences and is subject to regulations and rules as specified by each state.
Carryover rules vary for each state and are necessary to make sure that water carried over does not lock up space in the dams that are needed for the inflows to support allocations to all entitlements.
For example in New South Wales, below is a table showing the maximum carryover capacity specified as a percentage of the total licence volume.
|NSW Murray GS||50|
|VIC Murray HR + LR||100|
|Goulburn HR + LR||100|
|Loddon HR + LR||50|
|Campaspe HR + LR||100|
To find out more on other state carryover rules and processes, visit:
How do I decide to use carryover?
The decision to use carryover water will depend on your irrigation needs, carryover abilities and the level of risk you are willing to take. It is ultimately your decision on the risk you will take on whether to use carryover or to swap the risk of water-stressed crops for the risk of a spill.
Having access to timely information such as the risk of water-stressed crops and the risk of low water allocations is critical when you make decisions on your ability to carryover. We can help you by providing information on your carryover ability and advice on carryover markets.