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:

 

Calculation of unaccounted–for difference for the 2011–12 year

 

 

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 volumes of the water stores of the Daly region for the 2011–12 year

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.