are a reflection of water availability and the marginal cost of supply. Until recently water has been freely available and abstraction consent conditions have not imposed onerous restrictions. It is the policy of the council to repair visible and reported leaks as rapidly as possible. Active leak detection, to seek leaks in the reticulation which are not visible, is costly and can have variable results. Consequently active leak detection is only employed as a special project. One- off projects have been undertaken in Picton, Havelock and more recently in Renwick. As a result of those projects there was a small drop in unaccounted for water but the improvements were limited and could only be justified as cost effective if capital upgrades could be avoided or delayed. As shown in Chapter 3: Future Demand managing the peak day demand pattern maybe a more effective method of managing the resource in Marlborough Performance measure MDC Target Maintenance of the The percentage of real water Blenheim reticulation network loss from the local authority’s Picton networked reticulation Havelock To Be system. Renwick Confirmed Riverlands Awatere Wairau Valley 2.7.3 Flow and Pressure The measurement of flow and pressure at the point of delivery has not been included in the national non-financial performance indicators. However, the Council has kept the indicator and modified the measurement to improve the alignment between the customer experience and the performance indicator. The measures can be calculated through mathematical hydraulic models for each of the supply areas. The models are programmed to replicate the system conditions for the peak hour of peak demand days in the reporting period. The model assumes a pressure of 100 kPa at the point of delivery and a residual 100 kPa throughout the reticulation. The metric has been aligned with the requirements of the Firefighting Water Supplies Code of Practice. A flow of 25 litres/sec at a single node will meet the firefighting demand for domestic properties. The minimum standard of 12.5 litres/sec is not certain to fail the requirements of the Code of Practice but is indicative of areas with less hydraulic capacity. The Code of Practice allows the flows from a number of hydrants within a certain radius to be aggregated together and therefore the actual performance against the CoP is likely to be better than the performance indicator suggests. It is however a useful measure of the performance of the reticulation system. The additional cost of upgrading the Blenheim system to meet the Firefighting code of practice is $3.3M. A letter has been sent to the local fire service to confirm their position on this issue. 2.7.4 Response and Service Restoration Time to Customer Service Requests The performance indicators for response times to service interruptions will be modified to meet the national benchmark non-financial performance indicators. Rather than report the percentage of calls that meet the target time the new measure will record the median response time. The target adopted by the council is in line with the current performance (see Table 3). For reporting purposes there will be no distinction between the ‘critical’ incidents (damage to property or threat to persons) and the ‘urgent’ incidents of loss of supply. In practice this will probably have little effect. Many of the issues currently logged as ‘critical’ are issues related to private internal plumbing and customers requiring assistance to isolate the supply. There are very few incidents on the mains and services that causing damage and categorises as ‘critical’. Page 29