The water distribution system is an infrastructure system supplying water to urban areas. Since it has a great influence on the quality of life and financial aspect of customers, the performance evaluation of the system for an efficient management and operation is essential. Until now, most of the suggested performance indicators for the system are based on the available demand and pressure at demand nodes obtained from the hydraulic simulation. However, those performance indicators based on the hydraulic simulation may not consider the actual usability of water for customers properly. Therefore, in this study, the application of fuzzy functions along with the available demands at demand nodes, which are obtained from the hydraulic simulation, from the various points of view, makes us possible to evaluate the system performance by depending on the set value of the variables. For this purpose, we use a PDA model, which can simulate various abnormal operation conditions and suggest two performance indicators: the possible water supply range indicator (PWSRI) for the water supply performance evaluation for an individual demand node and the possible water supply indicator for the entire system (PWSIES). The suggested method and indicators are applied to the real water distribution system of A-city in Korea to verify the applicability.
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