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Nowadays, technical directors, operative engineers and managers in utility companies often meet with many variants of various types of water supply systems. Such a task is becoming complicated if solar photovoltaic (PV) energy is used as an energy source, due to its stochastic nature. This paper will present the use of the multi-criteria methods PROMETHEE and GAIA for the case of technological criteria. The aim of the paper is finding a technologically most appropriate variant of the observed urban water supply system (UWSS), given that the resulting solution differs according to the size of certain parts. It should be noted that the observed UWSS consists of PV generator and inverter (subsystem PV), pump station (subsystem PS) and water reservoir (subsystem W). In addition, this paper explains the scientifically innovative and applicable methodology for sizing the UWSS driven by PV energy.

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Water supply systems and their complexity demands analysis of a lot of different variants of obtained solutions for different types of water supply systems. Nowadays, in addition to meeting the technological and economic criteria, it is necessary to meet other criteria, such as environmental, social, law and many others. Among other procedures, multi-criteria methods are very often used for the solution of such issues. This paper will present the use of the multi-criteria method Promethee for the application of technological criteria. The purpose of this is finding a technologically most appropriate variant of the observed water supply system, given that the resulting solution variants differ according to the input parameters and size of certain parts. In addition, this paper explains the scientifically innovative and, in view of engineering, applicable methodology (Critical Period Method) for sizing the sustainable urban water supply system driven by solar photovoltaic (PV) energy.