Annual Report 2011 - Watercare

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Watercare Services Limited 2011 ANNUAL REPORT Healthy waterways 2A. Percentage of wastewater discharged compliant with consent conditions. 10 20 30 40 50 60 70 80 90 100 2011 97% 7/10 New Performance Measure Target 100% by 2020 Compliance with consents at the major urban wastewater treatment plants remained high throughout the year, although overall compliance levels were influenced by the poor quality of many of the 17 rural wastewater treatment plants transferred to Watercare upon integration. More than half these plants had a history of non-compliance with consent conditions because of process issues, many of which are difficult and costly to resolve. Watercare has developed both a longer-term strategy and more immediate measures, forecast to cost $50 million, to reduce the impacts of these plants on the environment. On a volume basis and excluding minor and technical breaches, Watercare achieved a 97% level of compliance with consent requirements at its wastewater treatment plants. 2B. Percentage performance against Statement of Corporate Intent target: dry-weather sewer overflows. 10 20 30 40 50 60 70 80 90 100 2011 100% 7/10 New Performance Measure Target ≤15 per 100km of pipe length Under the SCI, Watercare reports on the number of wastewater overflows from its network during dry weather as a measure of the ability of the network to manage current demand. For the 2010/11 year, Watercare achieved a result of 1.9 overflows per 100km of wastewater pipe, well within the SCI target of 15. 2C. Percentage performance against Statement of Corporate Intent target: unplanned sewer interruptions. 10 20 30 40 50 60 70 80 90 100 New Performance Measure Target
Watercare Services Limited 2011 ANNUAL REPORT Watercare at work Delivering a cleaner Hobson Bay Watercare successfully completed Project Hobson in March 2011, after nearly four years of construction work. Chief Infrastructure Officer Graham Wood says the project was about two things: providing for population growth and improving the local environment. “What we had was an ageing sewer pipe that crossed Hobson Bay and connected to a small pump station,” he says. “One of our concerns was that the sewer pipe would overflow during heavy rainfall when volumes would increase four-fold. Our solution was to replace the sewer pipe with a threekilometre-long wastewater tunnel that would connect to a high-capacity pump station in the Orakei Domain.” Work began in June 2007, when Watercare established construction sites in Orakei Domain and Remuera. The Orakei site was where two activities took place: it was the hub for the tunnelling operation and the place where the pump station was built. The Remuera site provided access, via a temporary road, to shorelines in Parnell and Remuera, where shafts were excavated to connect the tunnel to the existing wastewater network. The park was also the base from which the sewer pipe was demolished. A view of the wastewater tunnel during construction. Now commissioned, it transports over 3,000 litres per second during heavy rainfall. “The tunnelling operation was launched in April 2008 and progressed at a rate of around 120 metres a week for seven months. By the time it arrived in Parnell, over 100,000 tonnes of earth had been removed.” One of the major features of the new tunnel and pump station is their combined storage capacity. This means the flow to the Mangere Wastewater Treatment Plant can be regulated during heavy rain, reducing wet-weather overflows. For the people of Auckland, the most significant part of the project commenced in June 2010, when contractors began demolishing the sewer pipe that had crossed Hobson Bay for nearly 100 years. Within a few months, all signs of the pipe were gone and the construction sites were reinstated to parklands. “The tunnelling machine progressed at a rate of around 120 metres a week for seven months. By the time it arrived in Parnell, over 100,000 tonnes of earth had been removed.” Healthy waterways PAGE 29 Return to Contents page
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Annual Report 2011 - Watercare

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