Reliability analysis of water distribution systems under uncertainty

Equity in water supply is one of the major problems faced in intermittent water distribution systems. A new index ‘uniformity coefficient’ is introduced to measure the equity in distribution of water within the network, which may be useful for performance evaluation of water distribution networks (WDNs). An iterative head‐driven analysis technique is developed to compute the uniformity coefficient of a network. The effect of various design parameters of WDN on the uniform coefficient is studied. The results indicate that equity in water supply is significantly affected by the location of the tank and layout of the network. The equity in water supply can be improved in an existing network by staggered supply.

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“…The network analysed in the present study is taken from Kansal et al (1995), which is shown in Fig. 3.…”

Section: Resultsmentioning

confidence: 99%

Equity in water supply in intermittent water distribution networks

Gottipati¹,

Umamahesh

2013

Water & Environment J

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“…It originated in operations research in the form of so-called chance constrained programming [22][23][24] and more recent applications (although called reliabilitybased design) are found in civil engineering structures 25,26 , mechanical mechanisms 27 and water distribution systems 28 .…”

Section: Reliability-based Designmentioning

confidence: 99%

Optimal Mean and Tolerance Allocation Using Conformance‐based Design

Savage

Tong

Carr

2005

Quality & Reliability Eng

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In this paper, we invoke probability constrained optimization to establish a framework for allocating means and tolerances in design for quality that focuses on customer satisfaction at predictable cost levels. The optimal allocation minimizes the production costs while ensuring that responses conform probabilistically to their specification limits. An overall system probability of conformance is obtained from a quality policy (e.g. defect rate, process capability index). Probabilities are evaluated using limit-state functions and fast integration methods. The three quality metrics (i.e. target/larger/smaller-is-best) and robustness are addressed naturally. The methodology is developed in detail and compared with the traditional minimum total cost approach. Optimal means and tolerances are found for an electromechanical servo system and a power division circuit to illustrate the practicality and potential of the approach.

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“…For example, in the field of pipe networks, several studies have been done (21)(22)(23). This determination is not an easy task, but there have been many studies examining this problem for different types of systems.…”

Section: What Is Reliability?mentioning

confidence: 99%

“…Examples where performance reliability is the measure can be found in the literature for pipe networks, electrical systems, and structures (22,26,38). In our five representative systems, the mechanical reliability is the most common measure of reliability.…”

Section: Defining and Evaluating Reliabilitymentioning

confidence: 99%