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South East Queensland: Statement of Changes in Water Assets and Water Liabilities

for the year ended 30 June 2022

  • The volume of water in the region's storages significantly increased during 2021-22 after three consecutive years of decline.
  • This increase represents the change in water volume in the region's surface water storages.

Schematic representation of the South East Queensland region. Total water inflows during 2021–22 was 16,790 GL. Total water outflows was 17,929 GL. Water storage at 30 June 2022 was 806 GL more than the previous year.

The Statement of Changes in Water Assets and Water Liabilities is provided in the table below.
The statement presents the actual water flows associated with the region's water stores, as well as the changes in water assets and water liabilities that occurred during the year.

 

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  2022 ML 2021 ML 2020 ML 2019 ML 2018 ML 2017 ML
Water inflows
Surface water inflows 16,094,792 4,101,177 3,364,833 1,265,194 2,916,757 3,236,197
Precipitation on storages 416,343 158,107 118,553 136,150 191,987 171,058
Precipitation on rivers 210,911 48,071 38,616 21,086 37,839 44,138
Runoff 14,938,578 3,715,750 3,088,580 1,063,412 2,586,525 2,891,414
Flood return 506,787 164,296 105,053 30,388 82,351 112,266
Discharge from users 2,030 1,163 2,735 2,191 3,090 2,455
Treated wastewater discharge from urban water system* 20,143 13,790 11,296 11,967 14,965 14,866
 
Groundwater inflows 23,868 23,277 25,922 26,414 26,654 25,416
Leakage from urban water system* 23,868 23,277 25,922 26,414 26,654 25,416
 
Urban water system inflows 671,163 630,537 649,722 571,144 602,036 589,469
Diversion of surface water* 294,592 310,808 351,787 305,896 320,949 328,914
Extraction of groundwater* 10,089 13,698 14,842 6,688 7,396 7,868
Delivery of desalinated water 12,714 19,486 13,805 6,438 2,803 1,562
Inter-region delivery to the urban system 0 7 14 14 14 55
Wastewater collected 353,768 286,538 269,274 252,108 270,874 251,070
 
Total water inflows 16,789,823 4,754,991 4,040,477 1,862,752 3,545,447 3,851,082
Water outflows
Surface water outflows 17,296,275 3,646,360 2,800,469 1,564,879 2,711,169 3,416,812
Evaporation from storages 269,398 235,471 261,828 291,840 302,928 311,475
Evaporation from rivers 57,206 28,672 25,637 21,578 29,522 27,357
Outflow 15,476,955 2,663,406 1,842,257 760,467 1,746,115 2,435,611
Leakage to landscape 198,398 92,572 65,980 74,878 108,442 106,653
Overbank flow 981,794 284,713 199,619 74,995 180,807 179,085
Allocated diversion to individual users 12,782 25,431 48,273 30,103 17,281 22,600
Non-allocated diversion to individual users 1,158 1,295 1,282 1,312 1,317 1,323
Diversion of statutory rights 3,992 3,992 3,806 3,810 3,808 3,794
Diversion to the urban system* 294,592 310,808 351,787 305,896 320,949 328,914
Other surface water decreases 0 0 0 0 0 0
 
Groundwater outflows 15,265 25,664 33,192 23,794 19,788 17,515
Allocated extraction to individual users 3,631 7,510 11,222 10,905 5,972 5,538
Non-allocated extraction to individual users 1,545 4,456 7,128 6,201 6,420 4,109
Extraction to the urban system* 10,089 13,698 14,842 6,688 7,396 7,868
 
Urban water system outflows 617,102 590,007 448,669 489,735 609,151 601,208
Discharge to sea 241,444 202,965 191,649 178,314 236,589 213,598
Urban discharge to landscape 964 584 1,380 3,267 3,296 1,189
Leakage to groundwater* 23,868 23,277 25,922 26,414 26,654 25,416
Supply of drinking water for own use 1,434 1,681 1,761 1,672 0 82
Supply of drinking water to irrigation users 17,499 16,265 39,475 46,574 26,399 34,660
Supply of drinking water to urban users 286,684 307,695 154,205 196,653 276,092 278,787
Supply of drinking water to other regions 0 0 0 0 0 0
Supply of recycled water for own use 3,703 3,992 3,428 3,687 0 0
Supply of recycled water to urban users 8,010 8,552 8,270 10,157 13,083 19,478
Recycled water delivery to irrigation users 864 1,496 1,870 1,831 88 104
Other losses 6,411 6,838 8,354 8,609 11,268 11,242
Other wastewater losses 6,078 2,872 1,059 590 717 1,237
Treated wastewater discharge to surface water* 20,143 13,790 11,296 11,967 14,965 14,866
Wastewater transfer to other region 0 0 0 0 0 549
 
Total water outflows 17,928,642 4,262,031 3,282,330 2,078,408 3,340,108 4,035,535
Unaccounted-for difference 1,944,704 (542,703) (871,227) (103,484) (132,764) 13,490
 
 
Change in water storage            
Change in surface water storage 2,286,158 1,480,387 1,530,130 1,662,265 1,981,405 1,908,830
Change in groundwater storage 30,284 30,170 30,170 11,115 11,115 11,115
Change in urban water storage 0 0 0 0 0 0
Total change in water storage 805,885 (49,743) (113,080) (319,140) 72,575 (170,963)
 
Closing water storage 2,316,442 1,510,557 1,560,300 1,673,380 1,992,520 1,919,945
 
 
Change in water liability
Surface water liability 0 0 0 0 0 0
Allocation remaining: individual users 0 0 0 0 0 0
Allocation remaining: urban system* 0 0 0 0 0 0
 
Groundwater liability 0 0 0 0 0 0
Allocation remaining: individual users 0 0 0 0 0 0
Total change in water liability 0 0 0 0 0 0
             
Net change in water assets 805,885 (49,743) (113,080) (319,140) 72,575 (170,963)

* between-store flows

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