Perth
Statement of Changes in Water Assets and Water Liabilities

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2012 ML 2011 ML
Water asset increases
Surface water increases 676,117 144,248
9.1 Precipitation on surface water 25,567 15,637
9.4 Runoff to surface water 645,981 125,396
9.7 Delivery of water from outside region 4,569 3,215
Total Surface water increases 676,117 144,248
Groundwater increases 1,701,029 1,018,805
10.1 Groundwater inflow from outside region 50,337 52,412
10.2 Groundwater inflow from outside region at coast 0 0
10.3 Recharge from landscape 1,650,692 966,393
Total Groundwater increases 1,701,029 1,018,805
Urban water system increases 214,201 179,930
11.4 Wastewater collected 135,354 127,920
11.6 Delivery of desalinated water to urban water system 78,847 52,010
Total Urban water system increases 214,201 179,930
Total water asset increases 2,591,347 1,342,983
Water liability decreases
Surface water liability decreases 25,517 10,752
13.1 Adjustment and forfeiture of surface water allocation 13,903 303
13.4 Adjustment and forfeiture of inter–region commitment on surface water 11,614 10,449
Total Surface water liability decreases 25,517 10,752
Groundwater liability decreases 18,134 33,049
14.1 Adjustment and forfeiture of groundwater allocation 18,134 33,049
Total Groundwater liability decreases 18,134 33,049
Total water liability decreases 43,651 43,801
Water asset decreases
Surface water decreases 542,469 157,612
17.1 Evaporation from surface water 32,761 40,330
17.2 River outflow from the region 509,541 117,192
17.3 Leakage to groundwater 0 0
17.4 Leakage to landscape 167 90
Total Surface water decreases 542,469 157,612
Groundwater decreases 826,012 933,759
18.1 Groundwater outflow to outside region 33,964 31,602
18.2 Groundwater outflow to outside region at coast 304,748 264,790
18.3 Discharge to landscape 422,257 570,020
18.8 Entitled extraction of non-allocated groundwater to users 65,043 67,347
Total Groundwater decreases 826,012 933,759
Urban water system decreases 363,164 366,725
19.4 Delivery to urban water system users 237,896 243,724
19.7 Wastewater discharge outside of region 118,952 117,078
19.8 Other wastewater discharge 5,168 4,787
19.20 Other urban water system decreases 1,148 1,136
Total Urban water system decreases 363,164 366,725
Irrigation scheme decreases 23,777 30,678
20.4 Delivery to irrigation scheme users 23,777 30,678
Total Irrigation scheme decreases 23,777 30,678
Total water asset decreases 1,755,422 1,488,774
Water liability increases
Surface water liability increases 61,327 79,176
21.1 Surface water allocation announcements 25,027 42,876
21.4 Increase of inter-region commitment on surface water 36,300 36,300
Total Surface water liability increases 61,327 79,176
Groundwater liability increases 298,251 316,423
22.1 Groundwater allocation announcements 298,251 316,423
Total Groundwater liability increases 298,251 316,423
Total water liability increases 359,578 395,599
Unaccounted–for difference
Unaccounted–for difference 447,320 (407,682)
25.1 Unaccounted–for difference 447,320 (407,682)
Total Unaccounted–for difference 447,320 (407,682)
Total unaccounted–for difference 447,320 (407,682)
Change in net water assets 72,678 (89,907)