Design of water distribution networks based on hydraulic and mechanical reliability criteria

Due to the high costs of running a water supply network, designing networks with the lowest cost and highest reliability is of great engineering importance. One issue that has been the focus of recent years' research is the comparison of indexes and their relative success in measuring the reliability of water distribution networks. In this paper, a survey was conducted on the nodal pressure performance index, velocity, pressure difference, combined velocity and node pressure index, network flexibility performance index (NRI), minimum head surplus index (MSH) and entropy performance index (ERI) on the Hanoi water distribution network and Pescara juice were performed using the NSGA-II optimization algorithm and EPANET software. Performance of the indexes were tested for three scenarios of 5%, 10% and 20% pipe failure and four different cost levels and 100 iterations. The results showed that in the design of small water distribution network (Hanoi water network) at high and low cost level, NRI performance index and at medium water distribution network (Pescara water network) and at high cost level, NRI performance index and at low cost level, Node pressure performance index (PIP), Provided water requirements of network nodes more than other indexes, and the average pressure in these indexes is higher and causes less pressure drop in the network. Therefore, the use of these indexes in the design and modernization of the network provides greater reliability in the event of unexpected events such as sudden failure or failure of the pipes.