Sydney
19.4 Delivery to urban water system users
Supporting Information
The volume of water supplied through the urban system in 2010–11 was 474,594 ML.
A breakdown of potable and nonpotable water supplied through the urban system is provided in the following table.
|
Sydney Water Corporation (ML) |
Shoalhaven City Council (ML) |
Wingecarribee Shire Council (ML) |
Total water supplied for 2010-11 |
Potable water supplied for residential use |
320,670 |
5,840 |
4,098 |
330,608 |
Potable water supplied for commercial, industrial and municipal use |
106,774 |
3,858 |
0 |
110,632 |
Potable water supplied for other uses |
30,361 |
576 |
0 |
30,937 |
Nonpotable water supplied for residential use |
0 |
5 |
0 |
5 |
Nonpotable water supplied for commercial, industrial and municipal use |
0 |
2,412 |
0 |
2,412 |
Total |
457,805 |
12,961 |
4,098 |
474,594 |
Quantification Approach
Shoalhaven City Council – supply of potable water
Data Source
Provided by
Method
Shoalhaven City Council used the total metered volume from water billing records to determine the volume of potable water supplied.
Assumptions, Limitations, Caveats and Approximations
Uncertainty Information
The volume is based on measured data and the water balance. Estimated uncertainty based on meter accuracy and professional judgment is +/– 2%.
Sydney Water Corporation – supply of potable water
Data Source
Provided by
Method
SWC uses a water balance approach to determine volume of potable water supplied from the potable water supply system (Water Efficiency Report 2010–11). The water balance is a reconciliation of the volume of water produced by the water treatment plants with all known and estimated end uses.
Assumptions, Limitations, Caveats and Approximations
Uncertainty Information
The volume is based on measured data and the water balance. Estimated uncertainty based on meter accuracy and professional judgment is +/– 2%.
Sydney Water Corporation – supply of potable water for other use
Data Source
Provided by
Method
This item represents the total volume of potable water supplied other than for residential, commercial, industrial and municipal use. The volume includes the following components derived from water balance calculations and the measured data at each water treatment plant. The water balance is a reconciliation of the volume of water produced by the water treatment plants with all known and estimated end uses.
|
Volume (ML) 2010–11 |
Source |
Billed metered primary producers |
4,548 |
Derived from the Water Efficiency Report, Table 10 |
Billed metered other |
7,711 |
Derived from the Water Efficiency Report, Table 10 |
Billed unmetered |
2,435 |
Estimate used in water balance in the Water Efficiency Report Table 9 |
Unbilled metered and unbilled |
5,080 |
Derived from the Water Efficiency Report, Table 10 |
Unauthorised |
495 |
Estimate used in water balance in the Water Efficiency Report, Table 9 |
Meter under-registration |
8,974 |
Estimate used in water balance in the Water Efficiency Report, Table 9 |
Water balance - billing cycle |
1,387 |
Difference between the water balance used in the Water Efficiency Report, Table 9 and the measured data at each Water Filtration Plant. |
Unexplained difference |
1 |
Unexplained difference |
Total |
30,631 |
|
Assumptions, Limitations, Caveats and Approximations
The component 'billed primary producers' (4,548 ML) is taken as 'supply to agriculture', and total of the remaining components (30,631 ML) is taken as 'other supplies including non-metered, unbilled components'.
Uncertainty Information
The uncertainty was not quantified.
Wingecarribee Shire Council – supply of potable water
Data Source
Provided by
Method
This item represents the total volume of potable water supplied for residential, commercial, industrial and municipal use. The total volume is derived from data collected from calibrated outflow meters at water treatment plants, minus the volume estimated as leakage and bursts.
Assumptions, Limitations, Caveats and Approximations
Information required to separate the volume of potable water supplied to residential; and commercial, industrial and municipal use categories are not available.
Uncertainty Information
The volume is based on measured data. Estimated uncertainty based on meter accuracy is +/– 7%.
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 |
19.4 Urban water use |
Not applicable |
Not stated |
– |
Line item presentation: this is a new line item not reported in the 2010 Account |