Perth

This line item refers to two types of transfers of water from the water distribution system to major reservoirs within the Perth region:

1. transfer of water from the Harvey Water irrigation system to major reservoirs (1,500 ML)
2. transfer of water from the public water supply system to major reservoirs.

The volume of water transferred from the public water supply system to major reservoirs during 2009-10 is given below. The water transferred is a combination of surface water, groundwater and desalinated water. These internal water transfers occur to store desalinated water and groundwater produced during winter, and to balance the reservoirs to prevent overflow and enable summer peak supply capacity.

(1)  Water transfer to Victoria Reservoir is via Bickley Pumpback Reservoir

Data source

Water Corporation: Operational Data Storage System.

Data provider

Water Corporation.

Method

The other water distribution system decrease consists of two components – a transfer of water from the Harvey Water irrigation system and a transfer of water from the public water supply system. In both cases, the total volume of water transferred is based on measured inflow data at the major reservoirs.

Uncertainty

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 (Department of Water 2009).

Approximations, assumptions, caveats/limitations

Nil.