Trunk water main failures pose a risk to users often causing significant hydraulic, economic, and social consequences. Even larger consequences result when a fire event in the water distribution system coincides with a trunk water main failure event. The aim for this paper is to present a new model to characterize the consequences of trunk water main failure and fire event in water distribution systems. A series of metrics to characterize a range of consequences that result from the hydraulic changes during these events effecting the system and water users is presented. The consequence index equation is applied to the D-Town case study. The results suggest that the location of the trunk water main failure is the largest contributing factors to the severity of consequence with the fire location being less influential.
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