11.6 Delivery of desalinated water to urban water system

Supporting Information

This line item refers to the volume of desalinated water supplied to the urban water system from the Perth Seawater Desalination Plant.

Quantification Approach

Data Source

Water Corporation: Operational Data Storage System.

Provided by

Water Corporation.


Total desalinated water used for urban water supply is based on measured outflow data at the Perth Seawater Desalination Plant, located in Kwinana.

Assumptions, Limitations, Caveats and Approximations

It is assumed that all desalinated water is supplied directly to the urban water supply system. However, desalinated water may be stored in surface water storages prior to transfer into the urban water system.

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 11.6

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

11.6 Delivery of desalinated water

19.5.1 Delivery of desalinated water transferred-in to urban water supply system



Change in line item name and number