Perth
4.1 Irrigation water supply system
Supporting Information
Quantification Approach
Data Source
Provided by
Method
The volume of water within the irrigation water supply system (370 ML) was calculated by summing the volume of each section of the system. The entire irrigation system is a network of pipes. Therefore, the total volume of water within the irrigation system is the sum of the volumes 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) and the cross sectional area of the pipe (m2).
Assumptions, Limitations, Caveats and Approximations
It is assumed that all the pipes in the irrigation water supply system are at full capacity and have uniform diameter. Unless the pipe network is augmented or partly decommissioned, it is likely that this line item will always be 370 ML.
Uncertainty Information
This value is estimated to be in the range of +/– 5–10%.
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.
2011 Account line item |
2010 Account line item |
2011 Account volume at 30 June 2010 (ML) |
2010 Account volume at 30 June 2010 (ML) |
Change from the 2010 Account to the 2011 Account |
4.1 Irrigation water supply system |
5.4 Irrigation water supply system |
370 |
370 |
Change in line item number |