Perth
17.12 Entitled diversion of allocated surface water to urban water system
Supporting information
This line item volume (81,553 ML) represents the total surface water diverted for urban water supply in the Perth region during the 2011–12 year.
Total volume of water diverted from each surface water resource to the urban water system during the 2011–12 year is given in the following table.
Surface water resource |
Water diverted (ML) |
Storage |
|
Canning |
22,863 |
Churchman Brook |
853 |
Mundaring |
1,422 |
North Dandalup |
3,586 |
Samson Brook |
5,085 |
Serpentine and Serpentine Pipehead |
18,072 |
South Dandalup |
5,070 |
Stirling |
6,789 |
Victoria |
2,482 |
Wungong |
15,164 |
Other |
|
Murray River and tributaries (Dwellingup) |
167 |
Total |
81,553 |
Surface water made up approximately 25% of the inflows to the urban water supply system during the 2011–12 year. During the comparison year, surface water diverted to the urban water system was 115,629 ML, approximately 35% of the urban supply water (see Urban water system section of the 'Water resources and systems' note).
Quantification approach
Data source
Provided by
Method
Total water abstracted from surface water storages for urban water supply within the Perth region is equal to the total annual water released from the storages during the 2011–12 year. The water volumes released from the storages are metered at the outlet continuously and reported on a monthly basis.
Assumptions, limitations, caveats and approximations
Uncertainty information
Expected error for water meters is +/– 5%.
The Department of Water requires that all water meters, when tested under in situ conditions, must be within 5% accuracy across the full flow rate range (Guidelines for water meter installation 2009).
Comparative year
This line item corresponds to line item '17.12 Surface water allocation diversion – urban water system' reported in the 2011 Account.