Perth: Statement of Water Flows
The volume of water in the region's storages at 30 June 2016 was 167,165 ML, a decrease of 35,197 ML from the start of the 2015–16 year. This decrease reflects the reduction in water volume of most the region's surface water storages during the year.
The Statement of Water Flows is provided in the table below. The statement presents the actual water flows associated with the water stores of the region that occurred during the reporting year, including flows corresponding to the accrual transactions shown in the Statement of Changes in Water Assets and Water Liabilities.
Items in the statements are hyperlinked to the associated section of the Statement details. Methods used to derive item volumes are provided in the Reference information.
for the year ended 30 June 2016
| 2016 ML | 2015 ML | |
|---|---|---|
| Water inflows | ||
| Surface water inflows | 373,338 | 573,079 |
| Precipitation | 16,824 | 21,238 |
| Runoff | 352,148 | 549,983 |
| Delivery: inter-region | 4,366 | 1,858 |
| Total surface water inflows | 373,338 | 573,079 |
| Groundwater inflows | 1,212,581 | 1,349,748 |
| Inter-region inflow | 47,475 | 45,218 |
| Inter-region coastal inflow | 0 | 0 |
| Recharge: landscape | 1,165,106 | 1,304,530 |
| Total groundwater inflows | 1,212,581 | 1,349,748 |
| Urban water system inflows | 279,456 | 262,150 |
| Wastewater collected | 138,858 | 140,771 |
| Supply system delivery: inter-region | 1,953 | 1,922 |
| Delivery: desalinated water | 138,645 | 119,457 |
| Total urban water system inflows | 279,456 | 262,150 |
| Total water inflows | 1,865,375 | 2,184,977 |
| Water outflows | ||
| Surface water outflows | 245,367 | 465,788 |
| Evaporation | 28,912 | 46,052 |
| Outflow | 177,596 | 380,925 |
| Leakage: landscape | 150 | 150 |
| River and floodplain losses | – | – |
| Allocated diversion: individual users | 38,709 | 38,661 |
| Total surface water outflows | 245,367 | 465,788 |
| Groundwater outflows | 1,035,708 | 1,104,497 |
| Inter-region outflow | 21,863 | 23,439 |
| Inter-region coastal outflow | 300,629 | 341,881 |
| Discharge: landscape | 332,617 | 378,114 |
| Non-allocated extraction: individual users | 80,845 | 79,610 |
| Allocated extraction: individual users | 299,754 | 281,453 |
| Total groundwater outflows | 1,035,708 | 1,104,497 |
| Urban water system outflows | 411,311 | 406,371 |
| Supply system delivery: urban users | 236,200 | 232,537 |
| Recycled water delivery: urban users | 9,095 | 8,035 |
| Discharge: sea | 123,163 | 125,025 |
| Discharge: landscape | 6,145 | 5,962 |
| Supply system transfer: inter-region | 27,923 | 24,796 |
| Other supply system outflows | 8,785 | 10,016 |
| Total urban water system outflows | 411,311 | 406,371 |
| Irrigation scheme outflows | 32,197 | 31,426 |
| Delivery | 32,197 | 31,426 |
| Total irrigation scheme outflows | 32,197 | 31,426 |
| Total water outflows | 1,724,583 | 2,008,082 |
| Unaccounted-for difference | ||
| Unaccounted-for difference | (175,989) | (179,431) |
| Unaccounted-for difference | (175,989) | (179,431) |
| Total unaccounted-for difference | (175,989) | (179,431) |
| Total unaccounted-for difference | (175,989) | (179,431) |
| Opening water storage | 202,362 | 204,898 |
| Change in water storage | (35,197) | (2,536) |
| Closing water storage | 167,165 | 202,362 |