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Perth: Statement of Water Assets and Water Liabilities

as at 30 June 2022

  • Water availability in the Perth region's storages increased during 2021–22.
  • 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 2022 was 502 GL. Total water liabilities was 142 GL. Closing net water assets at 30 June 2022 was 359 GL, 41% 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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  2022 (ML) 2021 (ML) 2020 (ML) 2019 (ML) 2018 (ML) 2017 (ML)
Water assets
Surface water 471,635 365,776 360,126 416,977 391,306 298,985
Accessible storage 446,663 339,106 332,479 388,080 364,455 272,853
Dead storage 23,098 23,098 23,098 23,098 23,098 23,098
Rivers 1,874 3,572 4,549 5,799 3,753 3,034
 
Groundwater – – – – – -
Aquifers – – – – – -
 
Irrigation scheme 29,864 31,798 31,831 40,634 38,141 41,081
Claims: surface water* 29,864 31,798 31,831 40,634 38,141 41,081
 
Total water assets 501,499 397,574 391,957 457,611 429,447 340,066
Water liabilities
Surface water liability 39,873 40,320 40,353 49,156 46,663 49,603
Surface water allocation remaining: individual users 10,009 8,522 8,522 8,522 8,522 8,522
Surface water allocation remaining: irrigation scheme* 29,864 31,798 31,831 40,634 38,141 41,081
 
Groundwater liability 102,352 102,376 102,377 102,377 102,377 102,376
Groundwater allocation remaining: individual users 102,352 102,376 102,377 102,377 102,377 102,376
 
Total water liabilities 142,225 142,696 142,730 151,533 149,040 151,979
Net water assets
Net surface water assets 431,762 325,456 319,773 367,821 344,634 249,382
Opening net surface water assets 325,456 319,773 367,821 344,634 249,382 221,406
Net change surface water assets 106,306 5,683 (48,048) 23,178 95,261 27,976
Closing net surface water assets 431,762 325,456 319,773 367,821 344,634 249,382
 
Net groundwater assets (102,352) (102,376) (102,377) (102,377) (102,377) (102,376)
Opening net groundwater assets (102,376) (102,377) (102,377) (102,377) (102,376) (107,256)
Change in net groundwater assets 24 1 0 0 (1) 4,880
Closing net groundwater assets (102,352) (102,376) (102,377) (102,377) (102,377) (102,376)
 
Net irrigation water assets 29,864 31,798 31,831 40,634 38,141 41,081
Opening net irrigation water assets 31,798 31,831 40,634 38,141 41,081 35,372
Change in net irrigation water assets (1,934) (33) (8,803) 2,493 (2,940) 5,709
Closing net irrigation water assets 29,864 31,798 31,831 40,634 38,141 41,081
Total closing net water assets 359,274 254,878 249,227 306,078 280,407 188,087
Total change in net water assets 104,396 5,651 (56,851) 25,671 92,320 38,565

* between-store claims / liabilities

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