2009 Corporate total asset management plan
Darwin City Council
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Darwin City Council
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40 Corporate Asset Management Plan CCoorrppoorraattee AAsssseett MMaannaaggeemmeenntt PPllaann 5.3.2 Useful Life The useful life of an asset is defined as the number of years over which a depreciable asset is expected to be used. The useful life is influenced by the maintenance practices of a local government, environmental conditions eg park infrastructure in a rural park could be expected to last longer than the same asset in a coastal park, usage and materials. Determining the useful lives of conventional assets, such as plant and equipment, is not generally difficult as life cycle information is available. Many infrastructure assets, on the other hand, are so long lived that the information and experience needed to accurately predict asset lives is not available. Darwin City Council currently uses the following estimated ranges for its assets useful lives. Asset Estimated Useful Life Amended Useful Life Buildings 20 60 years Other Structures 4 50 years Plant and Machinery 2 20 years Furniture and Equipment 5 50 years Fixtures and Fittings 3 -35 years Road Pavements and Kerb 70 years 70 100 years Drainage 50 70 years 70 90 years Footpaths 25 years Walkways 25 years Cyclepaths 20 30 years Driveways 27 years Other Infrastructure 15 100 years Carparks 70 years Traffic Signals 35 years Plant & Equipment under Lease 5 years Table 3 Useful Lives of Assets Useful lives for road pavement and kerbing for local road suburban type roads were increased to 100 years for modeling purposes because it is recognized that that low traffic volumes and stable subgrades in these areas should result in longer sustainable lives. Again for modeling purposes, the useful life of drainage infrastructure was increased to the 70 90 year range to reflect the general consensus around Australia that this sort of infrastructure is expected to last longer the 100 years. These figures maybe revised as more detailed knowledge in relation to the assets are gained and recorded. In the absence of such information, Darwin City Council's infrastructure assets are to be given the longest sustainable life possible.