Adelaide
5.1 Surface water allocation remaining

Supporting information

In the Adelaide region, surface water allocations are recognised when there are water licences issued on the surface water resource (watercourse water). The surface water allocation remaining corresponds to the unused volume of the allocation that is carried forward to the following year. At 30 June 2012, the following volumes were carried over:

  • North Para River and tributaries, included in the Barossa Prescribed Water Resources Area (PWRA): 377 ML
  • Little Para River Prescribed Watercourse (PWC): 0 ML

During the 2011–12 year, the North Para River and its tributaries had water licences managed under the Barossa PWRA Water Allocation Plan (WAP), which describes the licence operating conditions including water allocations and carryover rules. The WAP indicates that licensees may carry over the unused portion of their allocation up to a maximum of 30% of the annual allocation.

The Little Para PWC did not have an operational WAP during the 2011–12 year, but water licences were on issue to manage access to water. Carryover of unused water allocation was not permitted on the Little Para PWC.

Other than Little Para, prescribed surface water resources located outside of the Barossa PWRA were managed by a Notice of Prohibition. Under that type of management arrangement, no water liability is created prior to the diversions taking place (see line item 17.6 Surface water diversions – other statutory rights).

For clarity of presentation, water that is categorised as watercourse water in South Australia—as defined by the Natural Resources Management Act 2004 (South Australia), corresponds to surface water reported in the National Water Account 2012.

The table below shows the line items and calculations that determine the water liability on the surface water asset for the 2011–12 year. The water liability at the beginning of the year (opening balance of the allocation remaining), increases due to allocation announcements and decreases due to diversions made during the year. Volumes permitted to be carried forward to the next year (closing balance of the allocation remaining) are determined at the end of the year. Unused allocated volumes that are not permitted to be carried forward are forfeited.

 

Surface water liability calculations during the 2011–12 year

Calculation

Line item

Volume (ML)

Opening balance

5.1 Surface water allocation remaining

add

21.1 Surface water allocation announcement

3,412

less

17.11 Surface water allocation diversion

1,116

less

13.1 Adjustment and forfeiture of surface water allocation

1,919

Closing balance

5.1 Surface water allocation remaining

377

–  not quantified

For further information on surface water rights that create a liability see line item 32.3 Surface water access entitlement for allocated diversions. 

The surface water allocation remaining corresponds to the volume of unused allocated water that may be carried forward to the following year, and is called a 'rollover allocation'. The volume reported as the opening and closing balance is 0 ML. While carryover of surface water allocations in the Barossa PWRA is permitted, this data was not available at the time this report was compiled. For water accounting purposes, where the volume of carryover is not available, the volume of unused allocated water is considered to be forfeited.