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Canberra: 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 decreased during 2021–22, following a significant increase in the previous year.
  • This decrease represents the change in water volume in the region's surface water storages.

Schematic representation of the Canberra region. Total water inflows during 2021–22 was 2,337 GL. Total water outflows was 2,824 GL. Water storage at 30 June 2022 was 3 GL less 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 2,143,162 1,129,179 250,878 272,193 423,985 732,130
Precipitation on storages 25,596 22,540 9,181 9,935 11,049 15,567
Precipitation on rivers 16,148 12,434 2,836 2,525 3,543 6,070
Runoff 832,320 589,720 156,913 180,690 259,066 398,980
Flood return 4,040 1,145 0 0 0 0
Inflow from outside the region 1,221,288 463,063 47,935 45,123 116,746 274,542
Treated wastewater discharge from urban water system* 43,770 40,277 34,013 33,920 33,581 36,971
 
Groundwater inflows 98,680 67,397 37,552 41,679 53,334 67,995
Inter-region inflow – – – – – –
Recharge from landscape – – – – – –
Recharge from surface water* 95,869 64,642 34,250 38,741 48,858 63,916
Leakage from urban water system* 2,811 2,755 3,302 2,938 4,476 4,079
 
Urban water system inflows 95,271 97,410 94,593 90,413 88,899 90,779
Wastewater collected 49,881 48,091 39,210 37,452 36,701 40,821
Diversion of surface water* 45,390 49,319 55,383 52,961 52,198 49,958
 
Total water inflows 2,337,113 1,293,986 383,023 404,285 566,218 890,904
Water outflows
Surface water outflows 2,733,798 1,309,070 283,153 256,964 403,496 977,136
Evaporation from storages 23,853 24,579 20,547 21,719 23,042 25,555
Evaporation from rivers 12,646 6,987 2,738 3,340 4,357 5,854
Outflow 2,481,672 1,140,697 166,956 136,997 271,379  822,485
Recharge to groundwater* 95,869 64,642 34,250 38,741 48,858 63,916
Overbank flow 73,091 21,418 0 19 560 6,561
Diversion of statutory rights 495 495 495 297 297 0
Allocated diversion to individual users 782 933 2,784 2890 2,805 2,807
Diversion to the urban system* 45,390 49,319 55,383 52,961 52,198 49,958
 
Groundwater outflows 753 983 1,499 1,198 1,265 1,254
Inter-region outflow – – – – – –
Discharge to landscape – – – – - -
Extraction of statutory rights 434 434 435 435 435 435
Allocated extraction to individual users 319 549 1,064 763 830 819
 
Urban water system outflows 89,909 90,571 89,805 87,153 86,886 87,731
Leakage to groundwater* 2,811 2,755 3,302 2,938 4,476 4,079
Supply of drinking water to urban users 42,244 46,062 51,309 49,197 47,187 45,244
Urban discharge to landscape 0 0 3 4 3 3
Treated wastewater discharge to surface water* 43,770 40,277 34,013 33,920 33,581 36,971
Other losses 847 1,144 1,106 1,041 1,613 949
Supply of recycled water to urban users 95 332 72 53 0 91
Supply of recycled water for own use 142 1 0 0 0 0
Other wastewater losses 0 0 0 0 26 394
 
Total water outflows 2,824,460 1,400,624 374,457 345,315 491,647 1,066,121
 
Unaccounted-for difference 483,856 239,803 (12,613) (93,837) (116,959) 174,587
 
 
Change in water storage (3,491) 133,165 (4,047) (34,867) (42,388) (630)
Change in surface water storage (3,491) 133,165 (4,047) (34,867) (42,388) (630)
Change in groundwater storage 0 0 0 0 0 0
Change in urban water storage 0 0 0 0 0 0
Total change in water storage (3,491) 133,165 (4,047) (34,867) (42,388) (630)
 
Closing water storage 327,497 330,988 197,823 201,870 236,737 279,125
 
 
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 (3,491) 133,165 (4,047) (34,867) (42,388) (630)

* between-store flows

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