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Perth

                                                                                                   

25.1.2.4 Allocation announcement on regulated flows—high security, urban holder

                             

Supporting information   


This line item refers to the water allocations for the major reservoirs within the Perth region that supply water to the urban system.

All but one of the 14 surface water resources are used for public water supply within the Perth region. The other (Helena River), primarily supplies water to the Kalgoorlie Goldfields, located outside the Perth region boundary.

The annual allocation for each surface water resource for 2009-10 is given below.

 

Surface water resource

Reservoir

Allocation (ML)

Perth city region

 

 

Canning River

Canning and Araluen Pumpback

34,200

Churchman Brook

Churchman Brook

3,700

Conjurunup Creek

Conjurunup Pumpback

6,000

Kangaroo Gully

Kangaroo Gully Diversion

3,500

Munday Brook

New Victoria and Bickley Pumpback

4,300

North Dandalup River

North Dandalup

22,200

Serpentine River

Serpentine Main and Serpentine Pipehead

53,800

South Dandalup River

South Dandalup and Lower South Dandalup Pumpback

26,900

Wungong Brook

Wungong

20,600

Southwest region

 

 

Harvey River

Stirling

40,610

Harvey River

Wokalup Pipehead

9,500

Samson Brook

Samson Main and Samson Pipehead

14,540

Other

 

 

Murray River and tributaries (Dwellingup)

 

167

Murray River and tributaries (Williams)

 

140

Total allocation

240,157

 

Quantification approach   


Data source

Western Australian Department of Water: Water Resource Licensing database.

 

Data provider

Western Australian Department of Water.

 

Method

The Water Corporation manages the urban water supply system, which is subject to licence agreements for abstraction of water from the reservoirs. One of the conditions of the licence agreement is that the maximum amount of abstraction for each year is announced by the Minister for Water on an annual basis. The announced allocation is made after a review, by the Department of Water, of surface water levels in the Perth Region in October of the reporting year.

The total surface water allocation announcement is assumed to equal 100% of the annual entitlement.

 

Uncertainty

Not applicable.

 

Approximations, assumptions, caveats/limitations

Nil.