13.6 Other surface water liability decreases

Supporting Information

The liability decrease to the surface water store from the adjustment and forfeiture of a part of the allocation/claim is 0 ML.

Reconciliation of this line item is shown in the following table.

Calculation of other surface water liability decreases in the 2010-11 year
Line item
Volume (ML)


5.6 Other surface water liability – opening balance



21.6 Other surface water liability



17.16 Other delivery of allocated water



5.6 Other surface water liability – closing balance



13.6 Adjustment and forfeiture of surface water allocation


Quantification Approach

Data Source

SCA and NSW Office of Water agreement; SCA database of daily requirements and releases; SCA compliance reporting to the NSW Office of Water.

Provided by



The volume is the difference between the opening balance for banked environmental water (9,795 ML), the additional water added to the bank during 2010–11 (3,100 ML) and the release from Warragamba Dam (7,532 ML).

As the volume of allocation remaining is carried over to 2012, the forfeiture for 2011 is 0 ML.

Assumptions, Limitations, Caveats and Approximations

Water remaining at the end of the reporting period is carried over into 2012.

Uncertainty Information

Based on entitlement and diversion information provided by the SCA.

Diversions are based on measured data. Estimated uncertainty based on accuracy of stream gauging is +/– 10%.

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 13.6

2011 Account line item

2010 Account line item

Value reported in the 2010 Account (ML)

Value reported in the 2011 Account (ML)

Additional information

13.6 Other surface water liability decreases

26.1.4 Adjustment and forfeiture of allocation on regulated flows – urban water access entitlement

Not stated


Prior period error: This volume was not accounted for in the 2010 Account. However this line item is required to reconcile the SCA banked environmental flow volume.