The unaccounted-for difference in the water distribution system store was calculated as 3,906 ML.
The closing balance of the water distribution system store was 465 ML.
The total water distribution system store asset increase was 242,605 ML.
The water distribution system store has significantly more inflow and outflow than the store holds. This is due to the store consisting mainly of pipes, which do not hold significant volumes. For this reason, the unaccounted-for difference was assessed as a percentage of the inflows, consisting of around 2% of the inflows to the store.
Uncertainty in estimating leakage from the water distribution system store may have contributed to the unaccounted-for difference.
The Western Corridor Recycled Water Scheme was the only recycled water use included in the water accounting statements as insufficient data were available to quantify all other recycled water use with representation faithfulness. The lack of inclusion of this additional recycled water use may have contributed to the unaccounted-for difference.
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
Related links
Water links
