Analytical simulation of water system capacity reliability 1. Modified frequency-duration analysis

Analytical simulation of water system capacity reliability 1. Modified frequency-duration analysis

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Article ID: iaor1990118
Country: United States
Volume: 24
Issue: 9
Start Page Number: 1431
End Page Number: 1444
Publication Date: Sep 1988
Journal: Water Resources Research
Authors: ,
Keywords: water
Abstract:

The problem addressed is the computation of the unavailability and expected unserved demand of a water supply system having random demand, finished water storage, and unreliable capacity components. Examples of such components include pumps, treatment plants, and aqueducts. Modified frequency-duration analysis estimates these reliability statistics by, first, calculating how often demand exceeds available capacity and, second, comparing the amount of water in storage with how long such capacity deficits last. This approach builds upon frequency-duration methods developed by the power industry for analyzing generation capacity deficits. Three versions of the frequency-duration approach are presented. Two yield bounds to system unavailability and unserved demand and the third gives an estimate of their true values between those bounds.

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