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National Water Account 2019

Melbourne: Statement of Water Flows

for the year ended 30 June 2019

  • The volume of water in the region's storages decreased during 2018–19 for the second successive year.
  • This decrease represents the change in water volume in the region's surface water storages.

 


 

The Statement of Water Flows is provided below and presents the actual water flows associated with the region's water stores during the year, including flows corresponding to the accrual transactions shown in the Statement of Changes in Water Assets and Water Liabilities.

 

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 2019 ML2018 ML2017 ML2016 ML2015 ML2014 ML
Water inflows
Surface water inflows783,1961,081,9241,893,529864,1651,073,0761,531,569
Precipitation50,069**62,104**74,360**56,263**60,364**73,428
Inter-region inflow126,955**157,667**196,912**132,079**158,395**198,467
Runoff566,395**798,421**1,510,712**626,694**764,602**1,152,658
Point return: irrigation24657618212161
Flood return25,522**44,260**90,152**33,501**59,568**75,757
Discharge: urban supply*00831281349362
Discharge: wastewater*13,65318,65817,44314,20628,22328,956
Delivery: inter-region agreement356**757**3,058**1,059**1,454**1,880
  
Groundwater inflows290,791319,906385,279301,539332,369360,260
Inter-region coastal inflow29,90328,47128,71328,39433,66530,504
Recharge: landscape119,528**125,443**127,676**119,311**123,707**128,239
Recharge: surface water*107,763**126,101**195,120**115,239**139,246**164,944
Leakage: urban system*33,59739,89133,77038,595**35,751**36,573
  
Urban water system inflows825,973835,015860,976796,474756,497765,973
Wastewater collected359,631361,263377,859350,527336,494350,537
Delivery: desalinated water22,37414,97246,209000
Allocated diversion: surface water*443,896458,708436,848445,845419,917415,334
Allocated extraction: groundwater*72726010286102
  
Total water inflows1,899,960**2,236,845**3,139,784**1,962,178**2,161,942**2,657,802
Water outflows
Surface water outflows1,226,3791,448,8141,930,1271,306,3071,497,1321,698,872
Evaporation72,833**78,831**78,674**74,096**78,219**81,770
Outflow534,774**682,047**1,026,002**584,548**732,237**871,942
Recharge: groundwater*107,763**126,101**195,120**115,239**139,246**164,944
Overbank flow41,672**79,644**169,415**63,365**103,799**137,830
Non-allocated diversion: individual users13,65212,243**12,04214,67012,55013,682
Allocated diversion: individual users7,6187,391**8,2345,0048,0589,844
Allocated diversion: urban system*443,896458,708436,848445,845419,917415,334
Transfer: inter-region4,1713,8493,7923,5403,1063,526
  
Groundwater outflows151,343153,431155,029149,266169,761162,126
Inter-region coastal outflow130,311132,349134,657124,561139,716137,638
Discharge: landscape––––10,91810,074
Allocated extraction: individual users20,96021,01020,31224,60319,04114,312
Allocated extraction: urban system*72726010286102
  
Urban water system outflows815,898815,165812,423789,630751,235747,342
Leakage: groundwater*33,59739,89133,77038,595**35,751**36,573
Delivery: urban users409,913398,598386,147389,989368,103363,157
Discharge: surface water*00831281349362
Recycled water delivery: irrigation12,41512,2248,97011,8687,5675,769
Discharge: sea268,481277,668301,846267,248261,293275,538
Discharge: landscape1072531901311830
Supply system transfer: inter-region5,8362,1591,071431247351
Supply system delivery: irrigation1,2561,5077561,36567112
Other supply system decreases13,68614,69913,35512,56712,39514,397
Recycled water delivery: urban users38,42231,48030,63331,44022,63422,072
Wastewater discharge: surface water*13,65318,65817,44314,20628,22328,956
Other wastewater decreases18,53218,02817,41121,50914,42355
  
Total water outflows2,193,620**2,417,410**2,897,579**2,245,203**2,418,128**2,608,340
  
Unaccounted-for difference142,842**89,999**(144,847)**100,374**149,584**(25,650)
  
 
Water storage
Surface water storage1,030,3821,181,5901,271,5491,173,3891,357,1281,462,755
Opening surface water storage1,181,590**1,271,549**1,173,389**1,357,128**1,462,755**1,439,526
Change in surface water storage(151,208)**(89,959)**98,160**(183,739)**(105,627)**23,229
Closing surface water storage1,030,382**1,181,590**1,271,549**1,173,389**1,357,128**1,462,755
  
Groundwater storage38,61938,61938,61938,61938,61938,619
Opening groundwater storage38,61938,61938,61938,61938,61938,619
Change in groundwater storage000000
Closing groundwater storage38,61938,61938,61938,61938,61938,619
Urban water storage28,80928,41929,02629,82828,74029,715
Opening urban water storage28,41929,02629,82828,74029,71529,132
Change in urban water storage390(607)(802)1,088(975)583
Closing urban water storage28,80928,41929,02629,82828,74029,715
Total closing water storage1,097,810**1,248,628**1,339,194**1,241,836**1,424,487**1,531,089

 

* between-store flows

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