Perth
Statement of Changes in Water Assets and Water Liabilities

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for the year ended 30 June 2013

2013 ML 2012 ML
Water asset increases
Surface water increases 381,999 676,117
9.1 Precipitation on surface water 20,317 25,567
9.4 Runoff to surface water 359,858 645,981
9.7 Delivery of water from outside region 1,824 4,569
Total Surface water increases 381,999 676,117
Groundwater increases 1,243,364 1,701,029
10.1 Groundwater inflow from outside region 48,940 50,337
10.2 Groundwater inflow from outside region at coast 0 0
10.3 Recharge from landscape 1,194,424 1,650,692
Total Groundwater increases 1,243,364 1,701,029
Urban water system increases 232,162 214,201
11.4 Wastewater collected 136,392 135,354
11.6 Delivery of desalinated water to urban water system 95,770 78,847
Total Urban water system increases 232,162 214,201
Total water asset increases 1,857,525 2,591,347
Water liability decreases
Surface water liability decreases 11,349 25,517
13.1 Adjustment and forfeiture of surface water allocation 272 13,903
13.4 Adjustment and forfeiture of inter-region commitment on surface water 11,077 11,614
Total Surface water liability decreases 11,349 25,517
Groundwater liability decreases 32,483 18,786
14.1 Adjustment and forfeiture of groundwater allocation 32,483 18,786
Total Groundwater liability decreases 32,483 18,786
Total water liability decreases 43,832 44,303
Water asset decreases
Surface water decreases 240,002 542,469
17.1 Evaporation from surface water 33,883 32,761
17.2 River outflow from the region 205,977 509,541
17.4 Surface water leakage to landscape 142 167
17.10 River and floodplain leakage, evaporation and errors - -
Total Surface water decreases 240,002 542,469
Groundwater decreases 853,286 826,012
18.1 Groundwater outflow to outside region 27,056 33,964
18.2 Groundwater outflow to outside region at coast 306,260 304,748
18.3 Discharge to landscape 447,397 422,257
18.8 Entitled extraction of non-allocated groundwater to users 72,573 65,043
Total Groundwater decreases 853,286 826,012
Urban water system decreases 367,701 363,164
19.1 Evaporation from urban water system 89 -
19.4 Delivery to urban water system users 232,315 237,896
19.7 Wastewater discharge outside of region 120,293 118,952
19.8 Other wastewater discharge 5,338 5,168
19.11 Transfer of water outside of region 1,259 -
19.20 Other urban water system decreases 8,407 1,148
Total Urban water system decreases 367,701 363,164
Irrigation scheme decreases 22,619 23,777
20.4 Delivery to irrigation scheme users 22,619 23,777
Total Irrigation scheme decreases 22,619 23,777
Total water asset decreases 1,483,608 1,755,422
Water liability increases
Surface water liability increases 70,186 61,327
21.1 Surface water allocation announcements 33,886 25,027
21.4 Increase of inter-region commitment on surface water 36,300 36,300
Total Surface water liability increases 70,186 61,327
Groundwater liability increases 284,520 298,903
22.1 Groundwater allocation announcements 284,520 298,903
Total Groundwater liability increases 284,520 298,903
Total water liability increases 354,706 360,230
Unaccounted-for difference
Unaccounted-for difference 69,952 444,462
25.1 Unaccounted-for difference 69,952 444,462
Total Unaccounted-for difference 69,952 444,462
Total unaccounted-for difference 69,952 444,462
Change in net water assets (6,909) 75,536