Water Distribution Network Reliability Assessment and Isolation Valve System
Publication: Journal of Water Resources Planning and Management
Volume 146, Issue 1
Abstract
Mechanical reliability analysis of water distribution networks (WDNs) refers to the assessment to provide correct service to customers under abnormal functioning conditions due to system component failures. Mechanical reliability depends on the isolation valve system (IVS) effectiveness in isolating a network segment and on the failure probability. The main aim of this work was the formal development of reliability indicators considering pressure-driven analysis (PDA) for customer demand and topological changes. Three factors influencing reliability were identified: (1) the hydraulic behavior of the still-connected network; (2) the topological performance of the IVS; and (3) the topological performance of the IVS with respect to unintended isolation. The reliability performance assessment of the network over time depends on the hydraulic capacity of the WDN under abnormal functioning conditions and on two IVS performance topological indicators of the risk of disconnection and unintended isolations. The hydraulic capacity was computed using PDA, whereas the topological risks were computed considering the unsupplied demand in the isolated segment and the normalized failure probability, i.e., the probability of a segment disconnection for an assumed failure occurrence in the network. The development of a modularity index for an IVS was achieved in a consistent framework and the integrated design of an IVS and district metering areas was introduced. The framework allows the analysis of the isolation valve failure. A real Apulian WDN was used to discuss and demonstrate the theoretical findings.
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Data Availability Statement
Some data used during the study are available from the corresponding author by request. The data of WDNs are confidential in nature and can be provided only with restrictions. The system tool WDNetXL (Giustolisi et al. 2011) is available from the corresponding author by request.
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Published In
Journal of Water Resources Planning and Management
Volume 146 • Issue 1 • January 2020
Copyright
©2019 American Society of Civil Engineers.
History
Received: Sep 18, 2018
Accepted: Apr 3, 2019
Published online: Oct 24, 2019
Published in print: Jan 1, 2020
Discussion open until: Mar 24, 2020
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