Perth
Water Accounting Statements : Changes in Water Assets and Water Liabilities

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2011 ML 2010 ML
Water asset increases
Surface water increases 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 increases 144,248 774,261
Groundwater increases 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 increases 1,018,805 1,829,635
Urban water system increases 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 increases 179,930 177,068
Irrigation scheme increases 0 0
12.5 Delivery of water from outside region to irrigation scheme 0 0
Total Irrigation scheme increases 0 0
Total water asset increases 1,342,983 2,780,964
Water liability decreases
Surface water liability decreases 10,752 10,159
13.1 Adjustment and forfeiture of surface water allocation 303 517
13.4 Adjustment and forfeiture of inter-region commitment on surface water 10,449 9,642
Total Surface water liability decreases 10,752 10,159
Groundwater liability decreases 33,049 7,641
14.1 Adjustment and forfeiture of groundwater allocation 33,049 7,641
Total Groundwater liability decreases 33,049 7,641
Total water liability decreases 43,801 17,800
Water asset decreases
Surface water decreases 157,612 826,473
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 - -
Total Surface water decreases 157,612 826,473
Groundwater decreases 933,759 1,195,290
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
Total Groundwater decreases 933,759 1,195,290
Urban water system decreases 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 decreases 7,234 6,441
Total Urban water system decreases 367,372 374,509
Irrigation scheme decreases 30,678 41,088
20.4 Delivery to irrigation scheme users 30,678 41,088
Total Irrigation scheme decreases 30,678 41,088
Total water asset decreases 1,489,421 2,437,360
Water liability increases
Surface water liability increases 79,176 79,489
21.1 Surface water allocation announcements 42,876 43,189
21.4 Increase of inter-region commitment on surface water 36,300 36,300
Total Surface water liability increases 79,176 79,489
Groundwater liability increases 316,423 303,997
22.1 Groundwater allocation announcements 316,423 303,997
Total Groundwater liability increases 316,423 303,997
Total water liability increases 395,599 383,486
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)
Change in net water assets (89,907) 2,313