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Adelaide: 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 increased during 2021–22 for the fourth consecutive year.
  • This increase represents the change in water volume in the region's surface water storages.

Schematic representation of the Adelaide region. Total water inflows during 2021–22 was 1,035 GL. Total water outflows was 806 GL. Water storage at 30 June 2022 was 3 ML higher 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 439,737 362,869 367,714 378,270 399,925 636,020
Precipitation on storages 9,521 7,756 7,276 7,023 9,874 9,318
Precipitation on rivers 3,086 2,155 2,291 2,040 2,641 5,740
Delivery of inter-region agreement to surface water 134,134 131,406 113,384 157,612 71,068 34,994
Discharge from groundwater* 73,921 73,921 73,921 73,921 73,921 73,921
Flood return 21,473 20,465 21,877 26,257 33,914 53,662
Runoff 197,344 123,710 145,085 109,907 208,507 458,385
Treated wastewater discharge from urban water system* - - - - - -
Urban water return* 258 3,456 3,880 1,150 - -
 
Groundwater inflows 285,457 284,717 238,634 202,379 272,690 374,096
Inflow from outside region 58 68 66 228 53 60
Inflow from outside region at coast 1,047 987 1,397 1,485 1,353 1,085
Leakage from farm dams - -   - - -
Leakage from urban water system* 20,548 10,839 10,908 2,162 11,941 14,130
Managed aquifer recharge by individual users 2,461 2,768 3,129 1,487 3,215 964
Managed aquifer recharge by urban system* 492 527 318 250 297 344
Recharge from landscape 260,851 269,528 222,816 196,767 255,831 357,513
 
Urban water system inflows 277,173 285,794 283,964 284,793 262,380 254,829
Delivery of desainated water 5,323 5,139 40,001 4,901 4,268 4,112
Diversion of surface water* 161,965 163,007 127,928 167,500 157,309 143,578
Wastewater collected 109,885 117,648 116,035 112,392 100,803 107,139
 
Irrigation scheme inflows 32,497 30,261 31,841 62,467 26,013 20,892
Delivery of inter-region agreement to irrigation scheme 10,949 11,032 10,765 11,051 4,801 5,683
Non-allocated extraction of groundwater* 229 207 279 200 200 200
Recycled water received from other water system 718 718 414 622 620 568
Recycled water received from urban water system* 20,601 18,304 20,383 50,594 20,392 14,441
 
Total water inflows 1,034,864 963,641 922,153 927,909 961,008 1,285,837
Water outflows
Surface water outflows 378,601 337,732 313,309 331,935 387,208 731,002
Evaporation from storages 16,736 16,019 14,524 16,494 17,857 14,339
Evaporation from rivers 3,086 2,932 2,519 2,522 3,564 5,021
Allocated diversion to individual users 2,967 3,360 3,012 3,730 3,340 4,995
Diversion to the urban system* 161,965 163,007 127,928 167,500 157,309 143,578
Outflow 143,665 121,599 127,245 106,434 157,437 432,191
Overbank flow 50,182 30,815 38,081 35,255 47,701 130,878
 
Groundwater outflows 120,469 120,361 121,657 112,062 137,870 116,628
Allocated extraction to individual users 43,539 44,766 45,392 34,368 53,793 40,608
Discharge to landscape - - - - - -
Discharge to surface water* 73,921 73,921 73,921 73,921 73,921 73,921
Extraction of statutory rights 0 0 0 0 7,797 434
Non-allocated extraction to irrigation scheme* 229 207 279 200 200 200
Outflow to outside region 251 221 293 252 269 199
Outflow to outside region at coast 2,529 1,246 1,772 3,321 1,890 1,266
 
Urban water system outflows 272,065 238,906 245,638 251,453 260,410 249,731
Discharge to sea 69,347 64,282 62,726 56,602 63,033 76,769
Leakage to groundwater* 20,548 10,839 10,908 2,162 11,941 14,130
Managed aquifer recharge* 492 527 318 250 297 344
Other losses 3,543 2,216 2,286 11,902 2,038 1,825
Other wastewater losses 6,957 2,507 1,633 8,155 6,941 8,394
Recycled water delivery to irrigation users* 20,601 18,304 20,383 25,389 20,392 14,441
Return to surface water* 258 3,456 3,880 1,510 - -
Supply of drinking water to irrigation users - - - - - -
Supply of drinking water to other regions - - - - 5,854 3,793
Supply of drinking water to urban users 138,290 128,981 140,730 138,368 141,744 123,830
Supply of recycled water to urban users 12,029 7,794 2,762 5,850 6,731 5,623
Treated wastewater discharge to surface water* - - - - - -
Urban discharge to landscape - - 12 1,265 1,439 582
 
Irrigation scheme outflows 34,238 32,988 34,776 35,628 31,853 21,879
Irrigation delivery 34,238 32,988 34,776 35,628 31,853 21,879
 
Total water outflows 805,373 729,987 715,380 731,078 817,341 1,119,240
 
Unaccounted-for difference (229,488) (232,089) (201,211) (196,148) (163,127) (159,349)
 
 
Change in water storage            
Change in surface water storage 3 1,565 5,562 683 (19,460) 7,248
Change in groundwater storage 0 0 0 0 0 0
Change in urban storages 0  0 0 0 0 0
Total change in water storage 3 1,565 5,562 683 (19,460) 7,248
 
Closing water storage 186,706 186,703 185,138 179,576 178,893 198,353
 
 
Change in water liability
Surface water liability 16 (290) 315 (123) (115) 168
Allocation remaining: individual users 16 (290) 315 (123) (115) 168
 
Groundwater liability 11,989 (1,501) 888 31,484 (14,111) 12,454
Allocation remaining: individual users 11,989 (1,501) 888 31,484 (14,111) 12,454
Total change in water liability 12,005 (1,791) 1,203 31,361 (14,226) 12,622
             
Net change in water assets (12,002) 3,356 4,359 (30,678) (5,234) (5,374)
 

* between-store flows

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