Adelaide
21.1 Surface water allocation announcements

Supporting Information

During the 2010–11 year the volume of allocated surface water increased by 2,759 ML. The volume reported was the sum of surface water allocations in the Barossa Prescribed Water Resources Area (PWRA). Surface water allocations are renewed each reporting period where the full allocation volume detailed on the user's licence is available for the user to divert. Surface water allocations described in the water allocation plan were for irrigation and industrial purposes and also included area-based conversions of volumes.

For more information on this surface water liability see 5.1 Surface water allocation remaining.

Quantification Approach

Data Source

South Australian Department for Water: Water Information and Licence Management Administration (WILMA) database.

Provided by

South Australian Department for Water.

Method

Surface water allocations for the 2010–11 year were obtained from the WILMA database for the Barossa PWRA in the Adelaide region.

Allocations for the Barossa PWRA that are area-based were converted to volumes using the guidelines on p35 of the Barossa PWRA Water Allocation Plan.

Surface water allocations in the Barossa PWRA broken down by purpose for the 2010–11 year
Purpose* Type Volume (ML)
Industrial                     Volumetric 233
Irrigation Area-based 81
Volumetric 2,445
Total 2,759

*The licence purpose information reflects the purpose of the licence when issued or possibly when adjusted.

Assumptions, Limitations, Caveats and Approximations

  • The method assumed that irrigation crop area conversion rates stated in Table 15 of the Barossa PWRA Water Allocation Plan represent an equivalent volumetric allocation.
  • Some irrigators can negotiate different conversion rates based on individual circumstances.

Uncertainty Information

The uncertainty estimate was not quantified.

Comparative year

In the 2010 Account surface water liabilities were not recognised in the Adelaide region; therefore there was no corresponding line item reported. In 2011, due to an improved understanding of the nature of surface water rights in the Adelaide region, water licences for surface water diversions in the Barossa PWRA were recognised as surface water liabilities. Restatement of the value published in the 2010 Account was made as the change was material, and increased the accuracy and comparability of the information provided to the users of the National Water Account. The restated comparative year volume is 2,759 ML.