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.
Component |
Volume (ML) |
Distribution pipe network |
5,403 |
Service reservoirs |
1,356 |
| Total |
6,759 |
Quantification approach
Data source
Provided by
Method
The storage volume of the urban water supply system is comprised of two components: the distribution pipe network and the service reservoirs.
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).
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.