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Abstract Reliability of Water distribution network refers to the ability of the system to provide adequate performance for consumers considering abnormal operating conditions. In case of link failure occurs, which is used as a measure of the mechanical reliability of the network, it is necessary to close a subset of valves which directly separate a small portion of the network. The use of isolation valves can cause a demand shortage to some consumers; the number of consumers affected will depend on the extent of valving in the system. When valves are operated to isolate a portion of the distribution system, they do not isolate a single pipe link but a portion of the system which may correspond to a part of a single pipe or several pipes and their junctions. It is important during hydraulic design to test for the effect of losing individual segments of the distribution system taking into consideration the location of valves when simulating the effect of losing such segment. The key to improve the reliability of the distribution system is to install sufficient valves so that the outage can be limited to a small portion of the system. This work aims to improve network mechanical reliability which refers to system components failure, such as pipe breaks. The analysis of isolation valve system always has been performed as a part of the assessment of system reliability. Therefore, it is important to identify the association between each subset of valves and the segments directly isolated by closing them and unintended isolation. Thus, this paper studies the impact of alternatives isolation valve systems design in water distribution network. The alternatives design rules has been performed for (EI- Mamoura water distribution network, Alexandria, Egypt) as a case study. This approach uses rules of thumb as the valve system design tool and the algorithm proposed by Giustolisi et al. as the hydraulic simulation solver. The application of the method on the network shows its capability to solve such actual Reliability basedcost effective problems. In addition, the results show the reliability of the applied algorithm to obtain the costeffectivc valve system design of El-Mamoura water distribution network. |