Multi-Objective Trade-Offs between Cost and Reliability in the Replacement of Water Mains
Publication: Journal of Water Resources Planning and Management
Volume 132, Issue 2
Abstract
Two of the main performance criteria of a water distribution system are that it is inexpensive to construct, operate, and maintain and that it operates in a reliable manner. These two criteria are often conflicting, thus implying that the decision maker needs to reach a compromise in scheduling mains for replacement. One way to facilitate this decision is to generate a trade-off surface that represents the compromise between the two objectives. This paper demonstrates the use of genetic algorithms to generate trade-off curves between cost and reliability for pipe replacement decisions. Curves for two planning scenarios are generated. The first identifies the trade-offs necessary for the current conditions. The second allows the water authority to determine the required levels of future expenditure, given funding constraints, to meet a specified level of service over the entire planning horizon. Alternatively, it provides an estimate of the impact on performance of delaying expenditure.
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Acknowledgments
This research was carried out while the second writer was funded by a Postgraduate Award from the Australian Research Council. The writers wish to thank John Nadilo, Glen O’Hara, and Paul Feronas of the South Australian Water Corporation, for their time in providing useful comments and for access to the data used in this research. Also the helpful comments of the three referees are gratefully acknowledged.
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Information & Authors
Information
Published In
Journal of Water Resources Planning and Management
Volume 132 • Issue 2 • March 2006
Pages: 79 - 88
Copyright
© 2006 ASCE.
History
Received: Oct 23, 2001
Accepted: Sep 2, 2004
Published online: Mar 1, 2006
Published in print: Mar 2006
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