3.4 Urban inter-region claim on water

Supporting Information

The volume for the line item is 216 ML.

Delta Electricity was entitled to 0 ML carry-over volume from the Fish River Water Supply Scheme at the beginning of the 2010–11 year. The carry-over volume was an inter-basin claim to receive water to Delta Electricity's water distribution systems.

By 30 June 2011, Delta Electricity had a carry-over volume of 216 ML. Reconciliation of this line item is shown in the following table.

Calculations for the urban inter-region claim on water for the 2010–11 year
Line item
Volume (ML)


Opening balance (as at 1 July 2010)



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



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



19.14 Decrease of urban inter-region claim on water



Closing balance (as at 30 June 2011)


Quantification Approach

Data Source

Delta Electricity data spreadsheets.

Provided by

Delta Electricity.


Carry-over volume available at the beginning of a year from the FRWSS is calculated from entitlement holder's allocation and metered supply volume for the previous two years (carry-over volume is capped at 20% of the maximum annual quantity). The metered supply volume is based on flow measurements by NSW State Water Corporation using ABB magflow meters.

Assumptions, Limitations, Caveats and Approximations


Uncertainty Information

The volume is based on measured data. Estimated uncertainty based on meter accuracy is +/– 2%. Meters are calibrated annually by ABB (meter supplier). The NSW Office of Water conducts an annual verification review on Delta Electricity's water data.

Comparative year

The following table compares the value at 30 June 2010 reported in this account with the corresponding value reported in the 2010 Account.


Comparative information from the 2010 Account for line item 3.4

2011 Account line item

2010 Account line item

Value reported in the 2010 Account (ML)

Value reported in the 2011 Account (ML)

Additional information

3.4 Other urban claims on water 

7.15 Non-physical water distribution system asset – other lumped



Change in line item name