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National Water Account 2016

Perth: Statement of Changes in Water Assets and Water Liabilities

Water availability in the Perth region decreased by 33,442 ML during the 2015–16 year. This follows a small increase in water availability in the region the previous year. The change in water available in the region at the end of the year is represented by the change in net water assets.




The Statement of Changes in Water Assets and Water Liabilities is provided in the table below. The statement is prepared on an accrual basis and presents the changes in water assets and water liabilities that occurred during the reporting year. These changes include accrual transactions (e.g. allocations and forfeitures) and actual water flows, both natural and engineered.

Items in the statements are hyperlinked to the associated section of the Statement details. Methods used to derive item volumes are provided in the Reference information.


for the year ended 30 June 2016

 2016 ML2015 ML
Water asset increases
Surface water increases373,338573,079
Delivery: inter-region4,3661,858
Total surface water increases373,338573,079
Groundwater increases1,212,5811,349,748
Inter-region inflow47,47545,218
Inter-region coastal inflow00
Recharge: landscape1,165,1061,304,530
Total groundwater increases1,212,5811,349,748
Urban water system increases279,456262,150
Wastewater collected138,858140,771
Supply system delivery: inter-region1,9531,922
Delivery: desalinated water138,645119,457
Total urban water system increases279,456262,150
Total water asset increases1,865,3752,184,977
Water liability decreases
Surface water liability decreases504,045
Adjustment and forfeiture: individual users504,045
Total surface water liability decreases504,045
Groundwater liability decreases8,75513,637
Adjustment and forfeiture: individual users8,75513,637
Total groundwater liability decreases8,75513,637
Total water liability decreases8,80517,682
Water asset decreases
Surface water decreases206,658427,127
Leakage: landscape150150
River and floodplain losses
Total surface water decreases206,658427,127
Groundwater decreases735,954823,044
Inter-region outflow21,86323,439
Inter-region coastal outflow300,629341,881
Discharge: landscape332,617378,114
Non-allocated extraction: individual users80,84579,610
Total groundwater decreases735,954823,044
Urban water system decreases411,311406,371
Supply system delivery: urban users236,200232,537
Recycled water delivery: urban users9,0958,035
Discharge: sea123,163125,025
Discharge: landscape6,1455,962
Supply system transfer: inter-region27,92324,796
Other supply system decreases8,78510,016
Total urban water system decreases411,311406,371
Irrigation scheme decreases32,19731,426
Total irrigation scheme decreases32,19731,426
Total water asset decreases1,386,1201,687,968
Water liability increases
Surface water liability increases38,84238,556
Allocation: individual users38,84238,556
Total surface water liability increases38,84238,556
Groundwater liability increases306,671287,753
Allocation: individual users306,671287,753
Total groundwater liability increases306,671287,753
Total water liability increases345,513326,309
Unaccounted-for difference
Unaccounted-for difference(175,989)(179,431)
Unaccounted-for difference(175,989)(179,431)
Total unaccounted-for difference(175,989)(179,431)
Total unaccounted-for difference(175,989)(179,431)
Change in net water assets(33,442)8,951