Adelaide
19.14 Adjustment and forfeiture of urban inter-region claim on water

Supporting information

Carryover of allocation volumes for the Class 6 water access entitlement (WAE) is not permitted as detailed in the water allocation plan for the River Murray Prescribed Watercourse. Therefore, the volume reported (82,523 ML) was the difference between the water allocation announced for the 2011–12 year (line item 11.15 Increase of inter-region claim on water by urban water system: 130,000 ML) and the volume of River Murray water effectively imported into the Adelaide region during that year (line item 11.9 Delivery of water to urban water system under inter-region agreement: 47,477 ML).

Note that the volume of water effectively imported into the Adelaide region under Class 6 WAE is different from the volume diverted from the River Murray (59,030 ML). The difference between diversion from the River Murray and effective import into the Adelaide region (11,553 ML) is explained by the following factors:

  • some of the water diverted by SA Water under Class 6 WAE is used outside the Adelaide region
  • transmission losses
  • measurement and estimation errors.

More information on the Class 6 water access entitlement can be found at line item 3.4 Urban inter-region claim on water.

Quantification approach

Data source

SA Water: water effectively imported into the Adelaide region (see line item 11.9 Delivery of water to urban water system under inter-region agreement); South Australian Department of Environment, Water and Natural Resources (DEWNR): Water Information and Licence Management Administration (WILMA) database: River Murray diversions.

Provided by

Bureau of Meteorology: calculations.

Method

The volume for the line item was calculated by subtracting the volume of River Murray water delivered to the Adelaide region's urban water system under the Class 6 WAE from the volume of water made available for abstraction (allocation) under the entitlement. This calculation is summarised in the following table.

Calculations of the decrease in urban inter-region claim in the 2011–12 year
Calculation Line item Volume (ML)

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

130,000
less

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

47,477

19.14 Decrease of urban inter-region claim on water
82,523

The forfeited volume of the unused Class 6 WAE was calculated as per the table below.

Calculations of the forfeiture of unused Class 6 water allocation in the 2011–12 year

Calculation

Line item

Volume (ML)

 

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

130,000

less

River water abstractions under Class 6 WAE 1

59,030

 

Forfeiture of unused Class 6 WAE

70,970

1 Sourced from the DEWNR WILMA licensing database. This volume corresponds to meter readings for the following pumping stations on the River Murray: Mannum (Mannum –Adelaide pipeline), Murray Bridge (Murray Bridge – Onkaparinga pipeline) and Swan Reach (Swan Reach – Stockwell pipeline). It is the volume used to debit SA Water allocation account under Class 6 WAE for the Adelaide metropolitan region.

The adjustment representing delivery of Class 6 WAE water to users outside the Adelaide region, quantification errors and pipeline losses was calculated as the difference between the River Murray abstractions (59,030 ML) and the actual delivery to the region's urban water system (47,477 ML): 11,553 ML.

Assumptions, limitations, caveats and approximations

Nil.

Uncertainty information

The uncertainty estimate was not quantified.

Comparative year

This line item corresponds to line item 19.14 'Decrease of urban inter-region claim on water' reported in the 2011 Account.

The volume of line item 11.9 Delivery of water from outside region to urban water system at 30 June 2011 has been restated in the 2012 Account. As this volume appears in the calculation of the 2010–11 year volume of line item 19.14 Adjustment and forfeiture of urban inter-region claim on water, the volume of line item 19.14 has been restated from 104,654 ML in the 2011 Account to 101,701 ML in the 2012 Account as shown in the following table.

Restatement for comparative year information for line item 19.14 Adjustment and forfeiture of urban inter-region claim on water

Operation

Line item

2012 Account volume for the 2010–11 year (ML)

2011 Account volume for the 2010–11 year (ML)

Additional information

 

3.4 Urban inter-region claim on water

0

0

 

add

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

150,000

150,000

 

less

11.9 Delivery of water from outside region to urban water system

48,299

45,346

prior error correction

less

3.4 Urban inter-region claim on water

0

0

 

equals

19.14 Adjustment and forfeiture of urban inter-region claim on water

101,701

104,654