The unaccounted-for difference in the groundwater store was calculated as –5,556 ML.
The closing balance of the groundwater store was 9,340 ML (based on the Central Lockyer water supply scheme [WSS] Benefitted Area extraction limit), with a contingent groundwater store asset of 54,846 ML in the Lockyer Valley groundwater management area (GMA). This resulted in a total Central Lockyer Valley aquifer store of around 67,000–78,000 ML (refer to contingent water assets and liabilities).
Groundwater store asset increases were not included in the water accounting statements as they could not be quantified accurately due to a lack of available data.
Groundwater extractions of 5,556 ML were the only groundwater decreases included in the water accounting statements. This volume is the sole source of unaccounted-for difference.
The unaccounted-for difference was around 59% of the closing balance or 8% of the total Central Lockyer Valley aquifer store.
The table below shows the unaccounted-for difference for the connected surface water store, groundwater store and water distribution system store, together with total water storage.
| Connected surface water store (ML) | Groundwater store 1,2 (ML) | Water distribution system store (ML) | Total water storage (ML) | |
|---|---|---|---|---|
| Measured opening balance | 1,743,538 | 9,340 | 465 | 1,753,343 |
| Total inflows | 3,045,426 | 0 | 242,605 | 3,288,031 |
| Total outflows | 2,281,666 | 5,556 | 238,699 | 2,525,921 |
| Calculated closing balance | 2,507,298 | 3,784 | 4,371 | 2,515,453 |
| Unaccounted-for difference | 416,387 | (5,556) | 3,906 | 414,737 |
| Net water assets | 2,090,911 | 9,340 | 465 | 2,100,716 |
Table notes:
National Water Account 2010
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