Abstract
This paper describes the hydraulic aspects of the design of drainage schemes, the main arterial branches of which consist of open channels. The TRRL hydrograph technique is applied to the subsidiary pipe network system but a new mathematical model technique is used for the main drainage channels. The spatially varied unsteady flow conditions within these channels are analysed using a full solution of the equations governing continuity, momentum and frictional resistance, the latter being defined in terms of the Colebrook-White transitional law. The new method was used in a feasibility study to determine the optimum drainage system for the proposed Maplin airport-seaport development, and results from this investigation illustrate the method. (A) /TRRL/
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