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Planned maintenance should not be confused with routine maintenance. Planned maintenance involves establishing which sewers, or other assets, should be cleaned and the optimum sewer cleansing frequency. This requires good management, efficient data storage systems and regular performance monitoring with a view to improving the system of planned maintenance so that the right balance is achieved between the levels of service achieved and their costs. |
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The manager of a sewerage system requires data on sewer blockages, rising main failures, pumping station failures, actual response times, flooding incidents and loss of WC use, as well as planned maintenance records for effective control. The data should be stored in such a way that they can be quickly retrieved and analysed appropriately. Although there are many suitable computer database packages to do this on a personal computer, it can be quite adequately done with an indexed manual data storage and retrieval system. |
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Term contracts offer the client, who has what is often a variable and unpredictable workload, much greater flexibility in terms of manpower and plant resources. The contractor may be the direct labour force of the local authority issuing the contract or, as is increasingly happening in Ghana, a private contractor. Contracts should be for a minimum period of 12 months. Contracts for longer periods of up to 5 years can save the administrative expense of re-advertising, re-tendering and assessing the tender. With longer contract periods, however, the effects of inflation will usually need to be incorporated. This may be by predetermined price increases in subsequent years, or by inflating prices in line with the inflation figure. The Institution of Civil Engineers (1988) Conditions of Contract for Minor Works is particularly appropriate in Ghana, as local contractors and civil engineers are very familiar with it. |
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Typically, a schedule of rates for general civil engineering |
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