Valve Distribution and Impact Analysis in Water Distribution Systems
Publication: Journal of Environmental Engineering
Volume 133, Issue 8
Abstract
In water distribution systems, valves play a crucial role in system reliability and security by providing a shutoff function when it is necessary to isolate subsystems. In this paper failure of shutoff valves to close is considered. The failure impact is quantified in terms of the expanding subnetwork and the increased number of customers out of service. To evaluate a system-wide valve failure impact, three methods are suggested: segment–valve matrix, decision tree analysis, and simulation. The segment–valve matrix shows the propagation of failure through the network as valves fail to close. The decision tree enumerates all possible valve failure combinations and corresponding event probabilities. Because the complete enumeration can be unwieldy, simulation procedures are offered that approximate the enumeration results closely. The details of the methods are illustrated with the aid of an example.
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Acknowledgments
The writers are grateful to the AWWA Research Foundation for supporting this research. The writers also wish to thank Mr. John Hammell and Ms. S. McCammon of the Weston Solutions, Inc. for many insightful discussions. They are also grateful to the reviewers for their constructive comments.
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© 2007 ASCE.
History
Received: Sep 22, 2006
Accepted: Jan 8, 2007
Published online: Aug 1, 2007
Published in print: Aug 2007
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