Perth
17.12 Surface water allocation diversion - urban water system

Supporting Information

This line item refers to the volume of water abstracted from major surface water storages for urban water supply.

Total surface water abstracted from each surface water resource for urban water supply to the Perth region during the 2010–11 year is given in the following table.

 

Volume of water diverted from each storage to the urban water system during the 2010–11 year

Surface water resource

Storage


Total water abstracted (ML)

Perth city area

 

 

Canning River

Canning and Araluen Pumpback

15,113

Churchman Brook

Churchman Brook

480

Conjurunup Creek

Conjurunup Pumpback

388

Helena River

Mundaring

1,631

Kangaroo Gully

Kangaroo Gully Diversion

15

Munday Brook

Victoria and Bickley Pumpback

2,178

North Dandalup River

North Dandalup

9,641

Serpentine River

Serpentine and Serpentine Pipehead

29,019

South Dandalup River

South Dandalup and Lower South Dandalup Pumpback

18,589

Wungong Brook

Wungong

17,621

Southwest area

 

 

Harvey River

Stirling

19,250

Harvey River

Wokalup Pipehead

0

Samson Brook

Samson and Samson Pipehead

1,644

Other

 

 

Murray River and tributaries (Dwellingup)

 

60

Murray River and tributaries (Williams)

 

0

Total allocation diversion

115,629

 

Quantification Approach

Data Source

Water Corporation: Operational Data Storage System.

Provided by

Water Corporation.

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 2010–11 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

Nil.

Uncertainty Information

Expected error for water meters is +/– 5%.

The Department of Water requires that all water meters, when tested in situ conditions, must be within 5% accuracy across the full flow rate range (Guidelines for water meter installation 2009).

Comparative year

The following table presents substantive changes in the line item reported in this 2011 Account with the corresponding line item in the 2010 Account.

 

Comparative year information for line item 17.12

2011 Account line item

2010 Account line item

2011 Account volume for the 2009–10 year (ML)

2010 Account volume for the 2009–10 year (ML)

Change from the 2010 Account to the 2011 Account

17.12 Surface water allocation diversion - urban water system

14.7.2.4 Allocation diversion of regulated flows–high security, urban holder

141,276

141,276

Change in line item name and number