A Procedure for Risk Mitigation of Water Supply System in Large and Populated Cities

Abstract eng:
The complexity of lifeline systems and their operation, their high number of components, and the variety of age in an old existing lifeline system, such as Tehran water supply, cause that all parts of the system can not be upgraded to the same level of performance. In this paper a procedure is proposed for mitigating the seismic risk of water supply system in large cities in which all important factors with regard to system components, including seismic resistance to various seismic hazard levels, component’s age, importance of the component role in the function of the whole system, reparability of the component and so on are taken into consideration. Furthermore, as applying the mitigating measures are very costly in case of large cities, and the required technology for applying the measures is not always available in all countries the economical and technological situations of the country at hand are also included in the propose procedure. One of the main features of the proposed procedure is considering the total value of mitigation costs and earthquake induced losses as a target function for minimization, and also considering the variation of costs with passage of time. On this basis the mitigation measures can be divided into three -short-, mid-, and long-term categories, and the optimal upgrading level for every component in every part of the city in each time window can be obtained by a high level of confidence. To show the efficiency of the proposed procedure it has been applied to Tehran metropolis.

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