Annual Report 2010 - Christchurch City Council

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Water supply Council activities and services Annual Report Christchurch Otautahi 2010 p111. Council activities and services Water supply How did we measure up? Activity Level of service Actual Target Water conservation The amount of water abstracted each year for the public water supply is quantified and monitored, with a view to reducing consumption 72.1% See trend graph following ≤ 71% (+/–10%) of total cap of 75M m3 potable water abstracted per year 358 m 3 per property per annum ≤ 355 m3 +/–10% water abstracted per property served per year The water supply network is inspected for leaks The public awareness of water conservation 17.2% of water mains network surveyed for leaks 61% The effectiveness of the Waterwise campaign is currently being reviewed ≥ 12.5% of the water supply network is inspected for leaks each year ≥ 70% public awareness / year Council runs water conservation campaigns Campaign completed on time The Waterwise campaign is run between October and February each year Water supply Continuous potable water is supplied to all customers 11.9 1 2 3 We have experienced more pipe bursts than in previous years. Investigations are underway to identify reasons for this with a view to address in the next LTCCP ≤ 9 unplanned interruptions per year / 1,000 properties served 0.74, being 39 shutdowns during the year. 1 4 ≤ 1 unplanned interruption of ≥4 hours on average per week each year 98% 5 6 ≥ 95% serious leaks (in urban areas) have a Council representative on site to assess and confirm repair options within one hour of being reported to Council 96.5% 5 6 ≥ 95% serious leaks (in rural areas) have a Council representative on site to assess and confirm repair options within two hours of being reported to Council 98.3% ≥95% medium leaks (in urban and rural areas) are repaired within one working day of being reported to Council 1 Only urban areas included in this measure. Excludes results from Banks Peninsula 2 Includes only interruptions to mains/sub-mains and laterals. Interruptions to individual properties are not measured 3 Includes all shut-downs – planned and unplanned 4 Shut downs considered to be shut downs to mains or sub-mains 5 All urgent requests for service, which includes serious leaks and other items such as no water 6 Contractor response times measured rather than Council response times
p112. Annual Report Christchurch Otautahi 2010 Council activities and services Water supply Council activities and services Water supply Activity Level of service Actual Target Water supply (continued) 97.2% ≥95% minor leaks (in urban and rural areas) are repaired within three working days of being reported to Council Risk to potable water supply is managed ‘Ba’ grading maintained 7 See trend graph following ‘Da’ grading maintained 8 Upgrading to Ba standard is planned to commence in 2011/12 Daily microbiological tests (presence/absence) are carried out by Council See trend graph following On track Upgrades are proceeding as follows: Birdlings Flat complete Pigeon bay 2010/11 Duvauchelle 2010/11 Little River 2011/12 Akaroa/Takamatua 2012/13 Wainui 2010/11 Maintain ‘Ba’ grading for all city supplies, excluding the north– west supply zone (Da) ‘Da’ for the north–west supply zone Undertake improvements to achieve ‘Cc’, or better risk grading from the Ministry of Health, for all rural area water supplies by 2012 268 installed ≥100 backflow prevention devices installed by Council (at owners’ cost) for highest risk premises each year 7 Last tested in February 2008 8 Last tested in July 2007
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Annual Report 2010 - Christchurch City Council

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