the transport and road research laboratory is engaged on research into the design and construction of underground pipelines. in order to assess the economic consequences of any changes in present practice which may be recommended, it is essential to have a detailed knowledge of the materials and operations involved and their costs. this report describes a procedure for calculating these costs, for rigid sewer pipes not exceeding 600 mm internal diameter, which is based upon site observations of the operations involved and published cost data. costs obtained by this procedure are in reasonable agreement with costs in a limited number of tenders, and with other estimates. its scope is at present limited by lack of data on some construction operations and by its simplified approach to site management problems.(a)

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