Perth
Statement of Water Flows

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for the year ended 30 June 2013

2013 ML 2012 ML
Water inflows
Surface water inflows 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 inflows 381,999 676,117
Groundwater inflows 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 inflows 1,243,364 1,701,029
Urban water system inflows 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 inflows 232,162 214,201
Total water inflows 1,857,525 2,591,347
Water outflows
Surface water outflows 296,042 592,130
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 - -
17.11 Entitled diversion of allocated surface water to users 30,817 24,975
17.14 Surface water transfer under inter-region commitment 25,223 24,686
Total Surface water outflows 296,042 592,130
Groundwater outflows 1,127,832 1,118,175
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
18.11 Entitled extraction of allocated groundwater to users 274,546 292,163
Total Groundwater outflows 1,127,832 1,118,175
Urban water system outflows 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 outflows 8,407 1,148
Total Urban water system outflows 367,701 363,164
Irrigation scheme outflows 22,619 23,777
20.4 Delivery to irrigation scheme users 22,619 23,777
Total Irrigation scheme outflows 22,619 23,777
Total water outflows 1,814,194 2,097,246
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
Opening water storage 217,185 167,546
Add/(Less): Change in water storage (26,621) 49,639
Closing water storage 190,564 217,185