Bureau Home » Water Information » National Water Account » 2019 Account » Perth » Water Accounting Statements » Changes in Water Assets and Water Liabilities

National Water Account 2019

Perth: Statement of Changes in Water Assets and Water Liabilities

for the year ended 30 June 2019

  • Water availability increased during 2018–19 for the third successive year.
  • The change in water available is represented by the change in net water assets.

 

The Statement of Changes in Water Assets and Water Liabilities is provided in the table below. The statement presents the changes in water assets and water liabilities that occurred during the year, including accrual transactions (e.g. allocations and forfeitures) and actual water flows, both natural and engineered.

 

Expand all Collapse all
 

Select comparative year

 2019 ML2018 ML2017 ML2016 ML2015 ML2014 ML
Water asset increases
Surface water increases 1,556,3671,374,9441,782,956778,502937,2891,154,779
Precipitation56,01455,87737,45316,82421,23825,009
Runoff938,880749,192840,406352,148549,983787,143
Delivery: inter-region00 0 **0 **0**0
Inter-region inflow173,882132,914444,08369,756––
Flood return71010,67419,919–––
Discharge: groundwater*350,701339,369339,166256,534291,896283,158
Discharge: urban supply*33,79784,49699,858**81,104**72,130**56,936
Riparian release: urban supply*2,3832,4222,071**2,136**2,042**2,533
  
Groundwater increases 1,688,7391,780,1341,637,7151,236,0221,372,6932,013,987
Inter-region inflow48,56245,77545,72447,47545,21852,788
Inter-region coastal inflow0 0 0000
Recharge: landscape1,611,1171,701,6021,567,1011,165,1061,304,5301,937,932
Leakage: urban system*24,13024,27023,43121,87321,15521,005
Managed aquifer recharge*4,9308,4871,4591,568**1,790**2,262
  
Urban water system increases 630,887694,320694,157688,344639,119636,209
Wastewater collected141,684141,185140,439138,858140,771141,024
Supply system delivery: inter-region1,9061,7951,8321,9531,9222,121
Delivery: desalinated water89,295148,904149,872138,645119,457113,060
Claims: surface water*247,950247,950247,950247,950247,950247,950
Claims: groundwater*150,052154,486154,064160,938129,019132,054
  
Irrigation scheme increases 113,333107,42097,565100,850113,990113,990
Claims: surface water*113,333107,42097,565**100,850**113,990**113,990
Total water asset increases3,989,3263,956,8184,212,3932,803,7183,063,0913,918,965
Water liability decreases
Surface water liability decreases 176,170200,002189,224192,322172,804183,581
Adjustment and forfeiture: individual users029221504,0455,219
Adjustment and forfeiture: urban system*140,139162,319156,624146,746128,301142,071
Adjustment and forfeiture: irrigation scheme*36,03137,39132,579**45,526**40,458**36,291
  
Groundwater liability decreases 27,73431,17727,00732,81520,52821,375
Adjustment and forfeiture: individual users08,63912,5418,75513,63714,172
Adjustment and forfeiture: urban system*27,73422,53814,46624,0606,8917,203
  
Total water liability decreases203,904231,179216,231225,137193,332204,956
Water asset decreases
Surface water decreases 1,588,7921,422,0191,560,606225,475427,127589,186
Evaporation73,60457,41748,59128,91246,05233,600
Outflow1,287,5801,185,6131,221,652196,413380,925555,390
Leakage: landscape150150 150 150150196
River losses144,767114,471238,759–––
Overbank flow82,69164,36851,454–––
  
Groundwater decreases 1,243,5171,153,5631,090,188925,1491,034,3041,361,559
Inter-region outflow22,93319,52319,35021,86323,43930,164
Inter-region coastal outflow306,565290,714261,169**233,290**261,245**352,251
Discharge: landscape480,437422,166389,247332,617378,114622,737
Non-allocated extraction: individual users82,88181,79181,25680,84579,61073,249
Discharge: surface water*350,701339,369339,166256,534291,896283,158
  
Urban water system decreases 622,450686,612685,591688,798638,680636,362
Supply system delivery: urban users228,344227,634224,799263,200232,537234,774
Recycled water delivery: urban users6,8564,6988,6229,0958,0358,203
Discharge: sea123,224118,202119,190123,163125,025124,900
Discharge: landscape4,6564,4655,7346,1455,9625,673
Supply system transfer: inter-region17,71318,56320,88327,92324,79620,797
Other supply system decreases8,5448,5188,4548,78510,01610,005
Leakage: groundwater*24,13024,27023,43121,87321,15521,005
Supply system discharge: reservoirs*33,79784,49699,858**81,104**72,130**56,936
Supply system discharge: riparian release*2,3832,4222,071**2,136**2,042**2,533
Managed aquifer recharge*4,9308,4871,4591,568**1,790**2,262
Claims: surface water*140,139162,319156,624146,746128,301142,071
Claims: groundwater*27,73422,53814,46624,0606,8917,203
  
Irrigation scheme decreases 109,984111,68891,956116,183104,986109,298
Delivery52,77754,05943,456**53,456**52,397**56,310
Leakage: landscape21,17620,23815,921**17,201**12,131**16,697
Claims: surface water*36,03137,39132,579**45,526**40,458**36,291
  
Total water asset decreases3,564,7433,373,8823,428,3411,955,6052,205,0972,696,405
Water liability increases
Surface water liability increases 404,882393,825384,388387,642400,496395,898
Allocation: individual users43,59938,45538,87338,84238,55633,958
Allocation: urban system*247,950247,950247,950247,950247,950247,950
Allocation: irrigation scheme*113,333107,42097,565**100,850**113,990**113,990
  
Groundwater liability increases 460,577462,646453,098467,609416,772419,316
Allocation: individual users310,525308,160299,034306,671287,753287,262
Allocation: urban system*150,052154,486154,064160,938129,019132,054
  
Total water liability increases865,459856,471837,486855,251817,268815,214
  
Unaccounted-for difference 262,162135,061**(122,914)**(288,556)**(232,852)**(519,071)
  
 
Change in net water assets      
Change in net surface water assets22,69795,64629,293(58,625)(13,603)81,074
Change in net groundwater assets0(1)4,8811,8387,3378,428
Change in net urban water assets00000(119)
Change in net irrigation scheme water assets2,493(2,940)5,709(13,770)7,4723,848
Total change in net water assets 25,19092,70539,883(70,557)1,20693,231

 

* between-store flows

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