Ord
25.1 Unaccounted–for difference
Supporting information
The volume recognised in the water accounting statements (596,553 ML) represents the total unaccounted-for difference for the Ord region for the 2012–13 year.
The unaccounted–for difference is the volume necessary to reconcile the opening water storage and closing water storage with the total water inflows and total water outflows reported in the water accounting statements. It is calculated according to the following table:
| Account | Volume (ML) | |
|---|---|---|
| Opening water storage (1 July 2012) | 10,775,781 | |
| add | Total water inflows | 2,739,639 |
| less | Total water outflows | 4,324,244 |
| less | Closing water storage (30 June 2013) | 8,594,623 |
| Unaccounted–for difference | 596,553 |
The unaccounted–for difference can also be calculated by summing the volumes necessary to reconcile (balance) the opening and closing storage with the water inflows and outflows of each of the separate water stores of the region, as shown in the following table.
Balancing item |
Volume (ML) |
Balancing item—surface water store |
596,553 |
Balancing item—groundwater store |
0 |
Unaccounted-for difference |
596,553 |
The unaccounted–for difference volume is entirely attributed to the balancing item of the surface water store. Detail of the balancing item's calculation is given in Table 4 of the Surface water note.
The volume of water in the groundwater stores within the Ord region could not be quantified. The Department of Water, in managing groundwater in the region, estimate that the volume of recharge to groundwater was equivalent to the volume of extraction. Therefore the volume of the balancing item for the groundwater store is 0 ML.