The unaccounted-for difference is the difference between total groundwater outflows (including groundwater extractions) and total groundwater inflows measured during 2009-10, as shown in the table below.
|
|
Account |
Volume (ML) |
|---|---|---|
|
|
Opening balance of groundwater store (as at 1 July 2009) |
- |
|
add |
Total of 15 Groundwater inflows |
1,800,124 |
|
minus |
Total of 16 Groundwater outflows |
1,812,521 |
|
minus |
Closing balance of groundwater store (as at June 30 2010) |
- |
|
|
Unaccounted-for difference |
-12,397 |
Because the volume of water in the groundwater stores within the Perth region could not be quantified accurately, the volume disclosed in the unaccounted-for difference (-12,397 ML) represents the net change in groundwater store throughout the reporting period.