Amgad Elansary

Air vessels are widely used in water distribution system to protect from pump power failure. The process of sizing air vessels is very important in obtaining the the most economical vessel size and correct size of inlet/out/outlet pipe diameters that will protect the pipe system. This paper presents the developed model TRANSNETP that is used in analyzing transient flow due to pump power failure in pipe network system using air vessel as a protection device and also determining the optimal volume and optimal inlet/outlet pipe diameter for air vessel

This paper addresses the problem of minimization of leakage in water distribution networks through the introduction and regulation of Flow Control Valves'FCVs". This problem is formulated as two objectives problem and is solved using multi-objective genetic algorithm. The first objective is to minimize the number of valves" a surrogate for installation valves cost" and the second one is represented by the minimization of the total leakage in the system while achieving the required pressure constraint at each node. The great advantage of mis study is that, in one run, several trade-off optimal solutions are obtained with a different level of compromise between the conflicting two objectives. Each solution from these optimal ones consists of: minimum number of FCVs, the best locations for the obtained number of valves and optimum valves settings, not only at one time period, but at each time period through the day …

In this paper, the problem of optimal rehabilitation of water distribution networks (WDNs) for both steady and transient state is investigated. Two objectives are considered in this study: minimizing rehabilitation cost by considering pipe size diameters as decision variables and minimizing the transient impacts by minimizing a surge damage potential factor (SDPF). A multi-objective ant colony optimization (MOACO) model is developed to solve this problem. The developed model is verified using the well-known New York City tunnel network. The application is carried out to modify an existing real WDN in New Cairo district designed in steady-state conditions to cope with the transient condition. The advantage of this study is to produce a set of solutions that help decision makers to identify the suitable approach, while evaluating and aggregating the preferences over multiple objective functions.