13.1 Adjustment and forfeiture of surface water allocation

Supporting Information

The volume recognised in the water accounting statements (23,664 ML) represents the total forfeiture of water allocations for all surface water supply in the Ord region not related to urban water systems or irrigation schemes. Forfeiture here occurs because the dates of the 'water year' of each allocation do not match the dates of the 2010–11 year.

Water supply licences are divided into licence entitlement purposes in the table below.

Volume forfeited/adjusted for each surface water licence purpose during the 2010–11 year

Licence category

Forfeited/adjusted volume (ML)



Commercial and institutional


Environment and conservation


Industry and power generation




Parks, gardens and recreation


Stock and domestic




Quantification Approach

Data Source

Department of Water: Water Resource Licensing (WRL) database and Annual Reports/Meter Card readings from licensees.

Provided by

Department of Water.


Any unused allocation cannot be carried over to a subsequent licence year. For each licensee, the portion of an entitlement that has not been abstracted by end of its reporting period is forfeited.

That is, the portion of surface water allocation that has not been abstracted at the end of the 2010–11 year is forfeited. The forfeiture is calculated as the total annual allocation for each licence minus total allocation diversion. However, given that the volume of abstraction is estimated to be the full allocation (refer to line item 17.11), this component of the forfeiture is assumed to be zero.

Entitlements that are terminated during the 2010–11 year are also considered to be forfeitures.

Assumptions, Limitations, Caveats and Approximations

Forfeiture is calculated based on available abstraction data. Where the abstraction data are estimated, the forfeiture is subject to the same assumptions and limitations of the abstraction data. Refer to Line item 17.11 Surface water allocation diversion.

Uncertainty Information

The uncertainty estimate was not quantified.

Comparative year

The following table compares the value for the 2009–10 year reported in this account with the corresponding value reported in the 2010 Account.

Comparative information from the 2010 Account for line item 13.1

2011 Account line item

2010 Account line item

Value reported in the 2010 Account (ML)

Value reported in the 2011 Account (ML)

Additional information

13.1 Adjustment and forfeiture of surface water allocation Adjustment and forfeiture of allocation on regulated flows – other lumped holders



Change in line item name and number. Licence reclassification and data availability

This has been restated because the Bureau of Meteorology changed the water accounting treatment of Tropical Forest Service licence (SWL162772). Previously, the liability was not recorded as the licence was deemed to be an unregulated due to the status of the Dunham River. However, the Tropical Forest Service licence is now regarded as regulated as the present obligation can be discharged from the available water source at Arthur Creek Dam. Also, availability of actual meter readings improved the accuracy of the volume presented in this line item.