Adelaide
19.14 Decrease of urban inter-region claim on water

Supporting Information

Carryover of allocation volumes for the Class 6 water access entitlement is not permitted for the entitlement as detailed in the Water Allocation Plan for the River Murray Prescribed Watercourse. Therefore, the volume reported (104,654 ML) was the unused portion of the allocation volume for the entitlement.

More information on the entitlement can be found at line item 3.4 Urban inter-region claim on water.

Quantification Approach

Data Source

Bureau of Meteorology.

Provided by

Bureau of Meteorology.

Method

The volume of water forfeited at the end of the 2010–11 year was calculated by subtracting the volume of water abstracted under the Class 6 Water Access Entitlement to River Murray water from the volume of water available for abstraction (allocation) under the entitlement. This calculation is summarised in the following table.

Calculations of the urban inter-region claim in the 2010–11 year
Calculation Line item Volume (ML)

11.15 Increase of inter-region claim on water by urban water system

150,000
less

11.9 Delivery of water to urban water system under inter-region agreement

45,346

19.14 Decrease of urban inter-region claim on water
104,654

Assumptions, Limitations, Caveats and Approximations

  • The inter-region claim to River Murray water is held on behalf of the Adelaide region. However, there is offtake from the three pipelines before entering the Adelaide region. Therefore the volume reported likely overestimates the volume of water forfeited.

Uncertainty Information

The uncertainty estimate was not quantified.

Comparative year

This line item corresponds to line item 24.4 Other lumped non-physical water asset decreases reported in the 2010 Account.

In the 2011 Account, the following changes were made that caused the 2009–10 year value to be restated:

  • In the 2010 Account the Class 6 water access entitlement for River Murray water (the entitlement) was reported as an inter-region claim held by the Adelaide region's surface water store. However, in the 2011 Account the entitlement was reported as a claim held on behalf of the Adelaide region's urban water system. This change was made because River Murray water abstracted under the entitlement is transferred directly into the Adelaide urban water system (although there is some subsequent discharge to surface water). Thus, representing the entitlement as a claim held by the urban water system provides clearer information for the user. This change did not affect the volume reported.
  • In the 2011 Account the volume of water that was actually delivered to the Adelaide region was reported instead of the volume that was abstracted under the entitlement (as reported in the 2010 Account) because this provides better information to users. If the latter (volume of water abstracted under the entitlement) was reported this would overestimate the volume of River Murray water used to supply the Adelaide region's urban water system. Restatement of the volume of water abstracted under the entitlement in turn required that the volume reported at line item 19.14 Decrease of urban inter-region claim on water also be restated. This change resulted in an increase (3,979 ML) in the volume reported for 30 June 2010.

These changes and their respective volumes are detailed in the following table. The restated comparative year is 97,009 ML.


Restatement of comparative year information for line item 19.14 Decrease of urban inter-region claim on water
2010 Account line item name Volume at 30 June 2010 reported in 2010 Account (ML) Change from the 2010 Account to the 2011 Account due to change in methodology (ML) Volume at 30 June 2010 reported in 2011 Account (ML)
24.4 Other lumped non-physical water asset decreases  93,030 (3,979) 97,009