Resource assessment process

When determining how much water will be allocated to water users, there are number of considerations, including:

  • how much water is in storage and how much of that is carried over as unused water from the previous year, including undelivered inter-state trades, where applicable
  • how much water is expected to flow into storages from natural inflows over the forecast period
  • the volume required to run the river, including end of system flows, transmission losses and evaporation losses
  • other requirements, including storage reserves and credits to environmental water allowances, where applicable.

In making the water resource assessment, the lowest recorded inflow sequence as at the commencement of the first water sharing plan is used so that the department only allocates water that is very likely to flow into the storages. Not all inflows contribute to increasing allocations.

Process map of how water is allocated

Below is a simple overview of how water is allocated in valleys in NSW.

How water is allocated in NSW

Detailed information on how water is shared in the regulated Murrumbidgee and Murray valleys in NSW is provided in the factsheets below.