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National Water Account 2018

Melbourne: Statement of Water Flows

for the year ended 30 June 2018

  • The volume of water in the region's storages decreased by 8% from the previous year.
  • This decrease represents the change in water volume in the region's surface water storages. This follows an annual increase in storage last year.

 




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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 2018 ML2017 ML2016 ML2015 ML2014 ML2013 ML
Water inflows
Surface water inflows1,083,2112,111,245 1,221,354 1,315,425 1,971,413 1,991,554
Precipitation49,68360,57642,41031,43139,79635,591
Discharge: groundwater*––––––
Runoff823,6381,806,253916,3451,105,0961,768,1541,903,420
Point return: irrigation5761821216163
Flood return41,87890,424––––
Discharge: urban supply*083128134936226,243
Delivery: inter-region agreement134,29789,441248,157150,198134,08426,237
Delivery: desalinated water15,00046,2160000
Discharge: wastewater*18,65817,44314,07928,23028,956–
 
Groundwater inflows212,730278,749 271,754 412,328 405,396 449,677
Inter-region inflow000000
Inter-region coastal inflow28,47128,71328,39433,66530,50431,076
Recharge: landscape116,110202,488192,457287,949338,319382,674
Recharge: surface water*––––––
Leakage: urban system*39,89133,77038,633**35,510**36,573**35,927
Other groundwater increases28,258**13,77812,27055,20400
 
Urban water system inflows820,043814,767796,635756,497 765,973749,773 
Wastewater collected361,263377,859350,688336,494350,537340,734
Allocated diversion: surface water*458,708436,848445,845419,917415,334408,812
Allocated extraction: groundwater*72601028610266
Other increases00000161
 
Total water inflows2,115,9843,204,7612,289,7432,484,250 3,142,782 3,191,004
Water outflows
Surface water outflows1,261,5091,864,112 1,223,990 1,353,177 1,760,559 1,860,913
Evaporation63,68165,14258,03454,82944,13247,133
Outflow650,3611,200,655696,897854,7171,274,0411,377,155
Recharge: groundwater*––––––
Overbank flow65,276137,399––––
Non-allocated diversion: individual users12,243**12,04214,67012,55013,68213,509
Allocated diversion: individual users7,391**8,2345,0048,0589,84411,073
Allocated diversion: urban system*458,708436,848445,845419,917415,334408,812
Transfer: inter-region3,8493,7923,5403,1063,5263,231
 
Groundwater outflows153,431155,029149,266  169,761 162,126 169,879
Inter-region outflow00 0 0 0 0
Inter-region coastal outflow132,349134,657 124,561 139,716 137,638 136,022
Discharge: landscape–– –10,918 10,074 18,379
Discharge: surface water*–– – ––  –
Allocated extraction: individual users21,01020,312 24,603 19,041 14,312 15,412
Allocated extractions: urban system*7260 102 86 102 66
Other groundwater decreases0**0 0 0 0 0
 
Urban water system outflows815,164810,834 792,857740,295747,342731,558
Leakage: groundwater*39,89133,770 38,633 **35,510 **36,573 **35,927
Delivery: urban users398,598386,197 390,311 368,451363,157  381,256
Discharge: surface water*0831 281 349 362 26,243
Recycled water delivery: irrigation12,2248,970 11,868 7,567 5,769 8,076
Discharge: sea277,668301,846 267,248 261,293275,538  268,134
Discharge: landscape253190 27 131 0 0
Supply system transfer: inter-region2,1591,071 431 247 351 250
Supply system delivery: irrigation1,507756 1,365 67 112 0
Other supply system decreases14,69911,717 15,574 15,745 14,397 11,672
Recycled water delivery: urban users31,47930,633 31,492 22,634 22,072 –
Wastewater discharge: surface water*18,65817,443 14,079 28,230 28,956 –
Other wastewater decreases18,02817,410 21,548 71 55 –
 
Total water outflows2,230,1042,829,975 2,166,1132,263,2332,670,0272,762,350
 
Unaccounted-for difference67,112**(335,617) **(128,865)** (281,939)**(473,199) ** (528,194)
 
 
Water storage
Surface water storage509,252555,653 515,682 522,005 581,952 582,979
Opening surface water storage555,653515,682  522,005  581,952   582,979 686,630
Change in surface water storage(46,401)39,971 (6,323) (59,947) (1,027) (103,651)
Closing surface water storage509,252555,653 515,682  522,005  581,952  582,979
 
Groundwater storage38,61938,619 38,619 38,619 38,61938,619 
Opening groundwater storage38,61938,619 38,619 38,619 38,619 38,438
Change in groundwater storage00 0 0 0 181
Closing groundwater storage38,61938,619 38,619 38,619 38,619 38,619
Urban water storage28,41929,026 29,828 28,740 29,715 29,132
Opening urban water storage29,02629,82828,740   29,715 29,132 25,202
Change in urban water storage(607)(802) 1,088 (975) 583 3,930
Closing urban water storage28,41929,026 29,828 28,740  29,715 29,132
Total closing water storage576,290623,298 584,129 589,364 650,286 650,730
 

 * between-store flows

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