Water Corporation: Operational Data Storage System.
Total desalinated water used for public water supply is based on measured outflow data at the Perth Seawater Desalination Plant, located in Kwinana.
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).
The Perth Seawater Desalination Plant supplies water to local areas and also feeds into Serpentine Trunk Main. However, these volumes are relatively minor and, therefore, it is assumed that all desalinated water is supplied directly to the public water supply system.