Sydney
11.15 Increase of inter-region claim on water by urban water system
Supporting Information
The volume for this line item is 5,399 ML.
Water supply from the Fish River Water Supply Scheme (FRWSS) is based on water supply agreements between NSW State Water Corporation and its customers, including Lithgow City Council (LCC) and Delta Electricity. NSW State Water Corporation has a 'deemed' water management licence for the FRWSS and operates it in collaboration with the Customer Council, of which LCC and Delta Electricity are members.
Delta Electricity and LCC have a maximum annual quantity that they are able to divert under this scheme which is subject to a set of operating rules (see Inter-valley transfers in Contextual information). As some of the water diverted under this claim is transferred to areas outside of the Sydney region, the volume reported for this line item is assumed to be the volume diverted by both LCC and Delta Electricity under the FRWSS (5,183 ML see Line item 11.9) plus the stated 2011 carryover of 216 ML.
See the following table for further details of this line item.
| Calculation |
Line item |
Volume (ML) |
|
0 |
|
add |
11.15 Increase of urban inter-region claim on water by urban water system |
5,399 |
less |
11.9 Delivery of water to urban system under inter-region agreement |
5,183 |
less |
0 |
|
equals |
3.4 Urban inter-region claim on water – closing balance |
216 |
Quantification Approach
Data Source
Provided by
Method
Volumes are calculated from annual allocation, carry-over volume and metered supply data. Metered supply data are based on flow measurements by NSW State Water Corporation using ABB Magflow meters.
Assumptions, Limitations, Caveats and Approximations
Lithgow City Council:nil.
Uncertainty Information
The volume is based on measured data. Estimated uncertainty based on meter accuracy is +/– 2%. Meters are calibrated annually by ABB (meter supplier).
Comparative year
The following table compares the value at 30 June 2010 reported in this account with the corresponding value reported in the 2010 Account.
2011 Account line item |
2010 Account line item |
Value reported in the 2010 Account (ML) |
Value reported in the 2011 Account (ML) |
Additional information |
11.15 Increase of urban inter-region claim on water |
Not stated |
0 |
3,380 |
Prior period error: This volume was not stated in the 2010 Account. However, the increase in the urban claim during the 2010 Account is assumed to be the diversion from the FRWSS during 2009–10 |