Perth
Water Accounting Statements : Physical Water Flows

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2011 ML 2010 ML
Water inflows
Surface water inflows 144,248 774,261
9.1 Precipitation on surface water 15,637 26,590
9.2 River inflow to region - -
9.4 Runoff to surface water 125,396 745,769
9.6 Overbank flood return to river channel - -
9.7 Delivery of water from outside region 3,215 1,902
Total Surface water inflows 144,248 774,261
Groundwater inflows 1,018,805 1,829,635
10.1 Groundwater inflow from outside region 52,412 51,369
10.2 Groundwater inflow from outside region at coast 0 0
10.3 Recharge from landscape 966,393 1,778,266
Total Groundwater inflows 1,018,805 1,829,635
Urban water system inflows 179,930 177,068
11.4 Wastewater collected 127,920 129,375
11.6 Delivery of desalinated water to urban water system 52,010 47,693
11.7 Stormwater ingress - -
Total Urban water system inflows 179,930 177,068
Irrigation scheme inflows 0 0
12.5 Delivery of water from outside region to irrigation scheme 0 0
Total Irrigation scheme inflows 0 0
Total water inflows 1,342,983 2,780,964
Water outflows
Surface water outflows 226,103 891,048
17.1 Evaporation from surface water 40,330 57,081
17.2 River outflow from the region 117,192 769,234
17.4 Leakage to landscape 90 158
17.5 Overbank flood spilling - -
17.11 Surface water allocation diversion 42,640 37,917
17.14 Surface water transfer under inter-region commitment 25,851 26,658
Total Surface water outflows 226,103 891,048
Groundwater outflows 1,220,803 1,468,611
18.1 Groundwater outflow to outside region 31,602 30,311
18.2 Groundwater outflow to outside region at coast 264,790 363,595
18.3 Discharge to landscape 570,020 731,892
18.8 Non-allocated extractions to users 67,347 69,492
18.11 Groundwater allocation extraction 287,044 273,321
Total Groundwater outflows 1,220,803 1,468,611
Urban water system outflows 367,372 374,509
19.4 Delivery to urban water system users 238,273 246,953
19.7 Wastewater discharge outside of region 117,078 116,507
19.8 Other wastewater discharge 4,787 4,608
19.20 Other urban water outflows 7,234 6,441
Total Urban water system outflows 367,372 374,509
Irrigation scheme outflows 30,678 41,088
20.4 Delivery to irrigation scheme users 30,678 41,088
Total Irrigation scheme outflows 30,678 41,088
Total water outflows 1,844,956 2,775,256
Unaccounted-for difference
Unaccounted-for difference (408,329) (24,395)
25.1 Unaccounted-for difference (408,329) (24,395)
Total unaccounted-for difference (408,329) (24,395)
Opening water storage 261,190 231,087
Add/(Less): Change in water storage (93,644) 30,103
Closing water storage 167,546 261,190