Multi Objective Dynamic Design of Urban Water Distribution Networks

In water distribution networks the initial and rehabilitation design are usually perform separately. However, it seems that the influence of the initial design upon the future condition of the network performance during operational years and rehabilitation activities are undeniable. Therefore, by combining the initial and rehabilitation designs, a new method is presented in this paper. This method called Dynamic Design of water distribution networks is capable of introducing cheaper and more reliable long term designs in comparison with normal initial design and rehabilitation design of networks. To assess this method, a fuzzy reliability index is introduced. Then by developing the multi objective version of the honey-bee mating optimization algorithm and applying it on two sample networks, final results of the multi objective dynamic design method is presented. Finally, this paper showed the positive performance and influence of dynamic design method on decreasing the design costs and increasing system reliability.