Perth: Statement of Water Flows
The Statement of Water Flows presents the actual water inflows and outflows associated with the water stores of the region that occurred during the reporting year.
Figure W3 shows the actual water flows, including flows corresponding to the accrual transactions shown in Figure W2 in the Statement of Changes of Water Assets and Water Liabilities.
Figure W3 Water flows for the region during the 2014–15 year
More detail on the water flows for the 2014–15 year is provided in the Statement of Water Flows below.
Items in the statements are hyperlinked to the associated section of the Supporting information notes. Methods used to derive line item volumes are provided in the Quantification approaches notes.
for the year ended 30 June 2015
| 2015 ML | 2014 ML | |
|---|---|---|
| Water inflows | ||
| Surface water inflows | 573,079 | 814,691 |
| Precipitation | 21,238 | 25,009 |
| Runoff | 549,983 | 787,143 |
| Delivery: inter-region | 1,858 | 2,539 |
| Total surface water inflows | 573,079 | 814,691 |
| Groundwater inflows | 1,349,748 | 1,990,720 |
| Inter-region inflow | 45,218 | 52,788 |
| Inter-region coastal inflow | 0 | 0 |
| Recharge: landscape | 1,304,530 | 1,937,932 |
| Total groundwater inflows | 1,349,748 | 1,990,720 |
| Urban water system inflows | 262,150 | 256,205 |
| Wastewater collected | 140,771 | 141,024 |
| Supply system delivery: inter-region | 1,922 | 2,121 |
| Delivery: desalinated water | 119,457 | 113,060 |
| Total urban water system inflows | 262,150 | 256,205 |
| Total water inflows | 2,184,977 | 3,061,616 |
| Water outflows | ||
| Surface water outflows | 465,788 | 623,047 |
| Evaporation | 46,052 | 33,600 |
| Outflow | 380,925 | 555,390 |
| Leakage: landscape | 150 | 196 |
| River and floodplain losses | – | – |
| Allocated diversion: individual users | 38,661 | 33,861 |
| Total surface water outflows | 465,788 | 623,047 |
| Groundwater outflows | 1,104,497 | 1,441,667 |
| Inter-region outflow | 23,439 | 30,164 |
| Inter-region coastal outflow | 341,881 | 433,999 |
| Discharge: landscape | 378,114 | 622,737 |
| Non-allocated extraction: individual users | 79,610 | 73,249 |
| Allocated extraction: individual users | 281,453 | 281,518 |
| Total groundwater outflows | 1,104,497 | 1,441,667 |
| Urban water system outflows | 406,371 | 404,352 |
| Supply system delivery: urban users | 232,537 | 234,774 |
| Recycled water delivery: urban users | 8,035 | 8,203 |
| Discharge: sea | 125,025 | 124,900 |
| Discharge: landscape | 5,962 | 5,673 |
| Supply system transfer: inter-region | 24,796 | 20,797 |
| Other supply system outflows | 10,016 | 10,005 |
| Total urban water system outflows | 406,371 | 404,352 |
| Irrigation scheme outflows | 31,426 | 33,622 |
| Delivery | 31,426 | 33,622 |
| Total irrigation scheme outflows | 31,426 | 33,622 |
| Total water outflows | 2,008,082 | 2,502,688 |
| Unaccounted-for difference | ||
| Unaccounted-for difference | (179,331) | 513,279 |
| Unaccounted-for difference | (179,331) | 513,279 |
| Total unaccounted-for difference | (179,331) | 513,279 |
| Total unaccounted-for difference | (179,331) | 513,279 |
| Opening water storage | 212,290 | 166,641 |
| Change in water storage | (2,436) | 45,649 |
| Closing water storage | 209,854 | 212,290 |