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Key performance indicators

 

Key performance indicators – water
2005/06
2006/07
Target
Result
Target
Result
Target met
Production/storage  
Operate water supply system within
environmental requirements (% compliance)
100
100
100
99.58*
X
Contribute to the Government’s
15% water conservation target (%)
1.9
2.1
2.5
2.8
√ √
Water transfer  
Reduce system losses as a percentage of water supplied to retail water businesses (%)
0.94
0.9
0.76
1.00**
X
Compliance with retail water business pressure requirements as set out in the Bulk Water Service Agreements (BWSAs) (%)
99.6
100
99.6
99.9
√
Water quality  
Compliance with BWSA water quality
requirements (%)
• Microbiological standards (E.coli)
99.99
100
99.99
100
√
• Disinfection by-products
100
100
100
100
√
• Aesthetics (turbidity)
86.8
98.5
86.8
91.7
√ √
• Aesthetics (aluminium)
99.9
98.8
99.9
99.2***
X
√ Target met      √√ Target exceeded      X Target not met


*Target was not achieved. On 7, 8 and 30 April 2007, environmental releases did not meet the required flows of 150 million litres per day at Yering Gorge (flows on these dates were between 139 million litres per day and 148 million litres per day). Releases into the river are made based on estimating travel time of flows to measuring points and other inflows to the river. These releases are usually calculated conservatively to ensure that flows are high enough at the measuring points. Due to drought conditions, releases from storages were kept to an absolute minimum with little ‘buffer’, which resulted in the breaches.

**Target was not achieved due to reasons including losses from aqueducts that were greater than estimated and reduced consumption, which resulted in a higher percentage loss.

***Target was not achieved due to the results from the Yan Yean Treatment Plant during a period of adjustment of the treatment process