5.2 Surface water allocation remaining - urban water system

Supporting Information

The volume recognised in the water accounting statements (670 ML) represents the volume of surface water allocation remaining for regulated entitlements for public scheme supply in the Ord region at the end of the 2010–11 year. Allocation remaining occurs because the dates of the 'water year' of each allocation do not match the dates of the 2010–11 year.

This category applies to two licences held by Water Corporation (WA): one for the King River/Wyndham area and one for Lake Argyle Village.

Quantification Approach

Data Source

Department of Water: Water Resource Licensing database and licensee meter readings.

Provided by

Department of Water.


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

Volume of surface water allocation remaining for the urban water system



Volume (ML)


Opening balance (as at 30 June 2010)


21.2 Surface water allocation announcements - urban system


17.12 Surface water allocation diversion – urban system



13.2 Surface water allocation remaining – urban system



Closing balance (as at 30 June 2011)


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 National Water Account 2010.

Comparative information from the 2010 Account for line item 5.2

2011 Account line item

2010 Account line item

Value reported in the 2010 Account (ML)

Value reported in the 2011 Account (ML)

Additional information

5.2 Surface water allocation remaining – urban water system Allocation on regulated flows remaining – urban holder



Change in line item name and number. Volume restated due to subsequent availability of actual meter readings

Surface water allocation remaining – urban system 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. Also, availability of meter readings improved the accuracy of the volume presented

  2. The Bureau reclassified the Lake Argyle Village licence (SWL166420) to urban supply.