Perth: Statement of Water Assets and Water Liabilities
- Water availability in the Perth region's aquifers and surface water storages increased during 2017–18.
- Groundwater and surface water assets increased for the second year in a row.
The Statement of Water Assets and Water Liabilities is provided in the table below. The statement presents the volume of water assets, and water liabilities at the start and end of the reporting year.
Select comparative year
| 2018 ML | 2017 ML | 2016 ML | 2015 ML | 2014 ML | 2013 ML | |
|---|---|---|---|---|---|---|
| Water assets | ||||||
| Surface water | 390,226 | 297,520 | 262,516 | 334,828 | 345,109 | 256,547 |
| Storages | 386,598 | 297,520 | **262,516 | **334,828 | **345,109 | **256,547 |
| Rivers | 3,628 | – | – | – | – | – |
| Groundwater | – | – | – | – | – | – |
| Aquifers | – | – | – | – | – | – |
| Urban water system | 0 | 0 | 0 | 0 | 0 | 119 |
| Claims: surface water* | 0 | 0 | 0 | 0 | 0 | 119 |
| Claims: groundwater* | 0 | 0 | 0 | 0 | 0 | 0 |
| Irrigation scheme | 38,141 | 41,081 | 35,372 | 49,142 | 41,670 | 37,822 |
| Claims: surface water* | 38,141 | 41,081 | **35,372 | **49,142 | **41,670 | **37,822 |
| Total water assets | 428,367 | 338,601 | 297,888 | 383,970 | 386,779 | 294,369 |
| Water liabilities | ||||||
| Surface water liability | 46,663 | 49,603 | 43,892 | 57,579 | 54,257 | 55,650 |
| Allocation remaining: individual users | 8,522 | 8,522 | 8,520 | 8,437 | 12,587 | 17,709 |
| Allocation remaining: urban system* | 0 | 0 | 0 | 0 | 0 | 119 |
| Allocation remaining: irrigation scheme* | 38,141 | 41,081 | **35,372 | **49,142 | **41,670 | **37,822 |
| Groundwater liability | 102,375 | 102,374 | 107,255 | 109,093 | 116,430 | 124,858 |
| Allocation remaining: individual users | 102,375 | 102,374 | 107,255 | 109,093 | 116,430 | 124,858 |
| Allocation remaining: urban system* | 0 | 0 | 0 | 0 | 0 | 0 |
| Total water liabilities | 149,038 | 151,977 | 151,147 | 166,672 | 170,687 | 180,508 |
| Net water assets | ||||||
| Net surface water assets | 343,563 | 247,917 | 218,624 | 277,249 | 290,852 | 200,778 |
| Opening net surface water assets | 247,917 | 218,624 | 277,249 | 290,852 | 200,778 | 294,271 |
| Change in net surface water assets | 95,646 | 29,293 | (58,625) | (13,603) | 90,074 | (93,493) |
| Closing net surface water assets | 343,563 | 247,917 | 218,624 | 277,249 | 290,852 | 200,778 |
| Net groundwater assets | – | – | – | – | – | – |
| Opening net groundwater assets | – | – | – | – | – | – |
| Change in net groundwater assets | 206,942 | 118,977 | (90,817) | (39,846) | 294,274 | (263,779) |
| Closing net groundwater assets | – | – | – | – | – | – |
| Net urban water assets | 0 | 0 | 0 | 0 | 0 | 119 |
| Opening net urban water assets | 0 | 0 | 0 | 0 | 119 | 119 |
| Change in net urban water assets | 0 | 0 | 0 | 0 | (119) | 0 |
| 0Closing net urban water assets | 0 | 0 | 0 | 0 | 0 | 119 |
| Net irrigation scheme water assets | 38,141 | 41,081 | 35,372 | 49,142 | 41,670 | 37,822 |
| Opening net irrigation scheme water assets | 41,081 | 35,372 | 49,142 | 41,670 | 37,822 | 0 |
| Change in net irrigation scheme water assets | (2,940) | 5,709 | (13,770) | 7,472 | 3,848 | 37,822 |
| Closing net irrigation scheme water assets | 38,141 | 41,081 | 35,372 | 49,142 | 41,670 | 37,822 |
| Total closing net water assets | 381,704 | 288,998 | 253,996 | 326,391 | 332,522 | 238,719 |
* between-store claims / liabilities
** different to published volume in historical accounts (see Governance section for more information)