Improved Model for Contaminant Intrusion Induced by Negative Pressure Events in Water Distribution Systems
Publication: Journal of Hydraulic Engineering
Volume 142, Issue 10
Abstract
Untreated water can intrude into water distribution systems through pipe cracks and/or openings when negative pressure events occur inside drinking water pipelines. It is important to determine the magnitude of the possible intrusion event. To estimate the intrusion flow rate more accurately, the effects of surrounding soil must be considered. In this paper, an analytical relationship is derived by combining the seepage in soil and the flow through an orifice for predicting the intrusion flow rate for a circular orifice under steady-state conditions. The effect of the pipeline on reducing the flow area is incorporated in the model. An experimental study that simulates a buried pipeline was carried out to validate the accuracy of the improved model, and the analytical results fit well with the experimental results.
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Acknowledgments
Financial support was received from the National Natural Science Foundation of China (No. 51309153), the National High-Tech R&D Program (863) of China (2012AA062608), and China National Water Pollution Control Program (project 2011ZX07301-004).
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Information
Published In
Journal of Hydraulic Engineering
Volume 142 • Issue 10 • October 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Dec 10, 2014
Accepted: Mar 9, 2016
Published online: Jun 6, 2016
Published in print: Oct 1, 2016
Discussion open until: Nov 6, 2016
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