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National Water Account 2017

Perth: Statement of Water Flows

The volume of water in the region's storages at 30 June 2017 was 297,520 ML, an increase of 35,004 ML or 13% from the start of the 2016–17 year. This reflects the increase in water volume of most the region's surface water storages. This is the region's first annual increase in three years.


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.


 2017 ML2016 ML
Water inflows
Surface water inflows1,341,861438,728
Inter-region inflow444,08369,756
Flood return19,919
Groundwater inflows1,612,8251,212,581
Inter-region inflow45,72447,475
Inter-region coastal inflow00
Recharge: landscape1,567,1011,165,106
Urban water system inflows292,143279,456
Wastewater collected140,439138,858
Supply system delivery: inter-region1,8321,953
Delivery: desalinated water149,872138,645
Total water inflows3,246,8291,930,765
Water outflows
Surface water outflows1,599,456264,184
Leakage: landscape150150
River losses238,759
Overbank flow51,454
Allocated diversion: individual users38,85038,709
Groundwater outflows1,042,3961,035,708
Inter-region outflow19,35021,863
Inter-region coastal outflow261,169300,629
Discharge: landscape389,247332,617
Non-allocated extraction: individual users81,25680,845
Allocated extraction: individual users291,374299,754
Urban water system outflows387,682411,311
Supply system delivery: urban users224,799236,200
Recycled water delivery: urban users8,6229,095
Discharge: sea119,190123,163
Discharge: landscape5,7346,145
Supply system transfer: inter-region20,88327,923
Other supply system outflows8,4548,785
Irrigation scheme outflows59,37770,657
Leakage: landscape15,92117,201
Total water outflows3,088,9111,781,860
Unaccounted-for difference(122,914)(221,217)
Opening water storage262,516334,828
Change in water storage35,004(72,312)
Closing water storage297,520262,516