Water supply systems are an important element of a strategic urban infrastructure. Their configurations are usually complex and dynamic. The optimal operation strategy of the water supply system should consider both current conditions as well as the future prognosis. Current conditions of the water supply system may be characterized by so called: failure rate. The parameter may be determined directly by the water system operator and defined as the average number of failures per the unit length of pipe and the time unit. The work presents a theoretical background for the selected mathematical models, that may be applied for the both short-term and mid-term predictions.

Water supply systems are an important element of a strategic urban infrastructure. Their configurations are usually complex and dynamic. The optimal operation strategy of the water supply system should consider both current conditions as well as the future prognosis. Current conditions of the water supply system may be characterized by so called: failure rate. The parameter may be determined directly by the water system operator and defined as the average number of failures per the unit length of pipe and the time unit. The work presents a theoretical background for the selected mathematical models, that may be applied for the both short-term and mid-term predictions.