Reliability Assessment Model for Water Distribution Networks
Publication: Journal of Pipeline Systems Engineering and Practice
Volume 11, Issue 2
Abstract
The aging water distribution networks in the US are approaching the end of their useful life, and more than 240,000 pipeline breaks are estimated to occur every year, which corresponds to an average of 25 breaks (or 100 mi) per year. Due to financial restrictions to maintain and rehabilitate their water distribution networks, many municipalities need to assess the reliability of their network and properly plan for their maintenance. Previous studies have mainly focused on the reliability assessment of individual network components such as pipes. Moreover, very limited network reliability models addressed the importance of network segments with customer accessibility to drinking water. Therefore, a model is developed in this study to evaluate the reliability of water distribution networks taking into consideration the weight of the importance of their segments. A modified Preference Ranking Organization METhod for Enrichment Evaluations (PROMETHEE) technique was applied to obtain the weight of the importance of segments using expert opinions. The working and failing states of pipes and segments were determined by developing the network’s failure tree, and their impacts on the network reliability were estimated. The evidential reasoning was applied to aggregate the effects of failure and working states of each component on the whole network and its segments. The failure rate and reliability of each component were determined based on what is available in the literature. Results obtained from PROMETHEE application showed that network segments of health care facilities are first in rank of the highest importance. Hence, maintenance and rehabilitation of these segments shall receive the top priority. A network in a Canadian city, which was evaluated using the proposed model, was found to have a reliability index of 0.93.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This publication was made possible by NPRP Grant No. (NPRP4-529-2-193) from the Qatar National Research Fund (a member of The Qatar Foundation). The statements made in this study are solely the responsibility of the authors.
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Published In
Journal of Pipeline Systems Engineering and Practice
Volume 11 • Issue 2 • May 2020
Copyright
©2019 American Society of Civil Engineers.
History
Received: Feb 9, 2019
Accepted: Aug 8, 2019
Published online: Dec 30, 2019
Published in print: May 1, 2020
Discussion open until: May 30, 2020
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