Until the outcome of the 2025 federal election, the Australian Government is operating under caretaker conventions

Perth
3.1 Urban water supply system

Supporting information

The volume reported in the water accounting statements (6,759 ML) refers to the volume of water within the distribution pipe network and service reservoirs of the urban water system at 30 June 2013.

Total volume of water within each component of the urban water supply system at 30 June 2013 is given below.

 

Volume of water within the Perth region's urban water supply system at 30 June 2013

Component

Volume
(ML)

Distribution pipe network

5,403

Service reservoirs

1,356
Total
6,759

Quantification approach

Data source

Facilities Mapping System database.

Provided by

Water Corporation.

Method

The storage volume of the urban water supply system is comprised of two components: the distribution pipe network and the service reservoirs.

Distribution pipe network

The volume of water within the urban distribution pipe network was calculated using a geographic information system (GIS) layer of the pipe network. The attributes of the GIS layer were used to select trunk mains and pipes used for distribution and reticulation. Only those features that are actively used for the potable network were selected.

The total volume of water within the system was calculated by summing the volume of each section of pipe within the system. The volume of a section of pipe is the product of the length of the pipe section (km) by the cross-sectional area of the pipe (m2).

Service reservoirs

The volume of water within the service reservoirs of the urban supply system is measured on a daily basis at each reservoir. The total storage volume in these service reservoirs at the end of the year was that measured at 30 June.

Assumptions, limitations, caveats and approximations

This value is an estimate of the volume of water within the supply system for the Perth metropolitan area; that is, it does not include water stored in the supply system for the Mandurah–Murray area.

It is assumed that all the pipes in the urban potable water supply system are at full capacity and have a uniform diameter.

Uncertainty information

Service reservoir storage volume uncertainty is estimated to be +/– 10%.