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National Water Account 2021

Perth: Statement of Water Assets and Water Liabilities

as at 30 June 2021

  • Water availability in the Perth region's storages increased during 2020–21.
  • Water availability is represented by the net water assets, which are the volume of water assets minus the water liabilities.

Schematic representation of the Perth region. Total water assets at 30 June 2021 was 397 GL. Total water liabilities was 143 GL. Closing net water assets at 30 June 2021 was 255 GL, 2% more than last year.

The Statement of Water Assets and Water Liabilities is provided in the table below. The statement presents the volume of water assets, and water liabilities at the start and end of the reporting year.

 

 

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  2021 ML 2020 ML 2019 ML 2018 ML 2017 ML 2016 ML
Water assets
Surface water 365,469 360,128 415,416 390,226 297,520 262,516
Accessible storages 338,590 332,217 386,248 363,500 274,422 **239,418
Dead storages 23,098 23,098 23,098 23,098 23,098 23,098
Rivers 3,781 4,813 6,070 3,628 – –
 
Groundwater – – – – – –
Aquifers – – – – – –
 
Urban water system 0 0 0 0 0 0
Claims: surface water* 0 0 0 0 0 0
Claims: groundwater* 0 0 0 0 0 0
 
Irrigation scheme 31,798 31,831 40,634 38,141 41,081 35,372
Claims: surface water* 31,798 31,831 40,634 38,141 41,081 **35,372
 
Total water assets 397,267 391,959 456,050 428,367 338,601 **297,888
Water liabilities
Surface water liability 40,320 40,353 49,156 46,663 49,603 43,892
Allocation remaining: individual users 8,522 8,522 8,522 8,522 8,522 8,520
Allocation remaining: urban system* 0 0 0 0 0 0
Allocation remaining: irrigation scheme* 31,798 31,831 40,634 38,141 41,081 **35,372
 
Groundwater liability 102,376 102,377 102,377 102,377 102,376 107,256
Allocation remaining: individual users 102,376 102,377 102,377 102,377 102,376 107,256
Allocation remaining: urban system* 0 0 0 0 0 0
 
Total water liabilities 142,696 142,730 151,533 149,040 151,979 **151,148
Net water assets
Net surface water assets 325,149 319,775 366,260 343,563 247,917 218,624
Opening net surface water assets 319,775 366,260 343,563 247,917 218,624 **277,249
Change in net surface water assets 5,374 (46,485) 22,697 95,646 29,293 **(58,625)
Closing net surface water assets 325,149 319,775 366,260 343,563 247,917 **218,624
 
Net groundwater assets (102,376) (102,377) (102,377) (102,377) (102,376) (107,256)
Opening net groundwater assets (102,377) (102,377) (102,377) (102,376) (107,256) (109,093)
Change in net groundwater assets 1 0 0 (1) 4,880 1,837
Closing net groundwater assets (102,376) (102,377) (102,377) (102,377) (102,376) (107,256)
 
Net urban water assets 0 0 0 0 0 0
Opening net urban water assets 0 0 0 0 0 0
Change in net urban water assets 0 0 0 0 0 0
Closing net urban water assets 0 0 0 0 0 0
 
Net irrigation water assets 31,798 31,831 40,634 38,141 41,081 35,372
Opening net irrigation water assets 31,831 40,634 38,141 41,081 35,372 **49,142
Change in net irrigation water assets (33) (8,803) 2,493 (2,940) 5,709 **(13,770)
Closing net irrigation water assets 31,798 31,831 40,634 38,141 41,081 **35,372
Total closing net water assets 254,571 249,229 304,517 279,327 186,622 **146,740
             
Total change in net water assets 5,342 (55,288) 25,190 92,705 39,882 **(70,558)

 

* between-store claims / liabilities

** different to published volume in historical accounts (see Governance for more information)

Note: quantification approaches used to derive each item volume are provided in the Methods