BALL, JE 1985, 'AN ALGORITHM FOR ROUTING UNSTEADY FLOWS IN URBAN DRAINAGE NETWORKS', JOURNAL OF HYDRAULIC RESEARCH, vol. 23, no. 4, pp. 327-341.
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Ball, JE 1970, 'ROUTING OF UNSTEADY FLOWS IN URBAN DRAINAGE NETWORKS.', National Conference Publication - Institution of Engineers, Australia, pp. 146-150.
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Flow in an urban drainage network is generally unsteady. Analysis of such flows therefore requires the solution of the unsteady flow (Saint Venant) equations. Among the numerical techniques which have been developed for the analysis of unsteady flows is the four-point implicit finite difference scheme commonly referred to as the Amein scheme. Use of the Amein scheme requires the solution of C multiplied by DELTA v equals minus R where C is a large sparse matrix and DELTA v and R are n multiplied by 1 column vectors. The algorithm proposed herein uses the properties of the drainage network to develop an efficient solution of C multiplied by DELTA v equals minus R based upon the partitioning and decomposition of the coefficient matrix C. An example urban drainage network is analysed showing the use of the proposed solution algorithm.
Roper, H, Kirkby, GA & Baweja, D 1970, 'DURABILITY - A QUANTITATIVE APPROACH.', National Conference Publication - Institution of Engineers, Australia, pp. 32-35.
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Durability of concrete structures is, despite considerable interest, as yet ill-defined. Methods of classification and quantification of durability of concrete members have recently been outlined in a series of co-authored papers. The application of such methods to structures is outlined. The accumulation of data requires the use of a computer, and methods of transferring data from photographic or television images to storage is discussed. The data is then available for computations, which relate types of deterioration effects to reinforcement and other details. Statistical procedures are introduced to systematise the data, and to permit comparisons to be made between structural members, within the same structure or between structures. The approach should, if successfully applied, allow better measurements of durability to be made, and hence improve techniques of predicting performance, making comparisons between materials and systems, assessing repair procedures and estimating repair costs.
