How water is allocated

Water sharing plans are developed by the department in consultation with the community determine how much water can be extracted over the long-term and how much needs to be set aside for the environment.

The volume of water licensed users can have, known as an allocation or available water determination (AWD), varies from year to year based on the licence category and size of their individual entitlement. This allocation is dependent on a range of factors including dam storage levels, river flows and catchment conditions.

The main licence categories, in order of priority are:

  • domestic and stock
  • town water supply
  • high security
  • conveyance
  • general security.

Supplementary access

Supplementary water, formerly known as off-allocation water, is effectively surplus flow that cannot be captured, or ‘re-regulated’, into storage. As soon as these conditions are identified for a particular river, a period of supplementary access is announced and details of the river reaches and time periods for supplementary access are published. Read more about Supplementary water.

Resource assessment process

When determining how much water will be allocated to water users, there are number of considerations the department takes into account. Learn more about the process of how water is allocated.

Allocations at the start of the water year

At the start of each new water year on 1 July, licensed water users are provided with an opening allocation for each category. This may be anywhere between zero and 100% of their full entitlement.

For most licence categories, if 100% of entitlement is allocated, then there is no more increase in that licence category for the remainder of the water year. However, if a licence holder receives less than 100% of entitlement, then an increase in allocation can occur, if sufficient water becomes available.

Domestic, stock and town water supply

Opening allocations for domestic, stock and town water supply are generally 100% unless conditions are very dry with low water in storage.

High security, conveyance

Full or near full high security allocations are made at the start of all but the very dry years and conveyance allocation is made commensurate with other allocations. This means that the operation of high security water delivery will align with a reduced conveyance allocation.

General security

General security licences are the last to receive allocations and are therefore the least secure licence category. They can start the year with low or zero allocation and typically receive incremental improvement as the year unfolds commensurate with rainfall and run-off. General security licences are the most susceptible to seasonal climatic variations.