Material Pipe Useful Life Material Pipe Useful Life Type Diameter Type Diameter B-ARCH 80 ST-GL 60 C-ARCH 80 ST-SW 100 CC 80 UNKNOWN 100 CI 100 UPVC 100 CU 40 VC 80 DI 0 100 DRUM 50 Plant Useful Life Mechanical Plant 40 Electrical Plant 25 Civil Structures 100 The data quality is regarded as fair. Of the pipes recorded in the asset management database one or more of the attributes (age, diameter or material type) was missing for around 24% of records. Estimates were made for the missing data based on adjacent pipes or the known history of land drainage in the area. Other assumptions included in the financial planning are shown in Table 11. Assumption Confidence in Risks of Incorrect Mitigation Measures Assumption Assumption Growth continues Medium Either decrease rate Regularly review within the medium to base affects income forecasts and high growth projection Or increased demand particularly following on assets and 2012 census, BERL accelerated and local intelligence investment Deterioration of High Accelerated renewal Continued condition underground assets programme monitoring and asset continues in line with management guideline useful lives Interest rate stability High Shortfall in income Loans through LGFA projections costs spread through Council activities Construction cost Low The resource drain as Continue to monitor rises a result of the contract prices, pre- Canterbury order where possible reconstruction may have significant impact on received prices Insurance costs Low Increased costs, Improved construction predictions reduced cover, standards high risk increased risk awareness and management costs management. Table 11 Assumptions Included in the Financial Forecasts Replacement of reticulation pipework will be with modern materials – PVC, polyethylene, ductile iron, steel or reinforced concrete. All plant and equipment will be replaced by their modern equivalent. The pipe laying rates are inclusive of manholes, valves, fittings apparatus and branch connections. The rates are an average across all ground conditions and depths and include for trench support and de-watering. Page 58