Daly
25.1 Unaccounted-for difference
Supporting information
In the Daly region, the unaccounted–for difference (23,844,170 ML) represents 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 (30 June 2011) |
500 |
add |
Total water inflows |
33,603,246 |
less |
Total water outflows |
9,759,076 |
less |
Closing water storage (30 June 2012) |
500 |
|
Unaccounted–for difference |
23,844,170 |
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 |
22,037,854 |
Balancing item—groundwater store |
1,806,316 |
Unaccounted-for difference |
23,844,170 |
The unaccounted–for difference volume is largely attributed to the balancing item of the surface water store. The balancing items's calculation is detailed in Table 4 of the Surface water note.
The volume of water in the groundwater stores within the Daly region could not be quantified. The Department of Land Resource Management, in managing groundwater in the region, estimates 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 was quantified as 0 ML.