5.1 Surface water allocation remaining

Supporting Information

The volume recognised in the water accounting statements (21,294 ML) represents the volume of surface water allocation remaining for regulated entitlements in the Ord region at the end of the 2011 Account. Allocation remaining occurs because the dates of the 'water year' of each allocation do not match the dates of the 2010–11 year.

The Western Australian Department of Water administers 100 separate licences in this category held by individual licensees. Licences relate to water sourced from the Main Ord River, Upper Ord River, Dunham River or King River/Wyndham.

Quantification Approach

Data Source

Department of Water: Water Resource Licensing database

Provided by

Department of Water


The allocation remaining was calculated as shown in the table below.

Volume of surface water allocation remaining



Volume (ML)


Opening balance (as at 30 June 2010)



21.1 Surface water allocation announcements



17.11 Surface water allocation diversion



13.1 Adjustment and forfeiture of surface water allocation



Closing balance (as at 30 June 2011)


The total allocation remaining on 30 June 2011 for private user entitlements is around two thirds of the volume announced. This is because there are many private user entitlements within the Ord region that do not have an anniversary date occurring at 30 June (in general, the water management year commences when the licence is issued).

Assumptions, Limitations, Caveats and Approximations


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 5.1

2011 Account line item

2010 Account line item

Value reported in the 2010 Account (ML)

Value reported in the 2011 Account (ML)

Additional information

5.1 Surface water allocation remaining Allocation on regulated flows remaining – other lumped holders



Change in treatment of licence

Surface water allocation remaining at 30 June 2010 has been restated because:

  1. The Bureau of Meteorology (the Bureau) used improved licence date information to calculate the remaining allocations on surface water entitlements as at 30 June 2010
  2. The Bureau reclassified the Lake Argyle Village licence (SWL166420) to urban supply
  3. The Bureau changed the water accounting treatment of Tropical Forest Service licence (SWL162772). Previously, no water liability was 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 treated as regulated, as the present obligation can be discharged from the available water source at Arthur Creek Dam.