Abstract
This study proposes a framework for improving the robustness of water distribution systems using the optimal valve installation approach with regard to system reinforcement. To improve the robustness in valve design, this study introduces critical segment selection technique and optimal valve location determination within the concept of segment. Using the segment finding algorithm, the segment and the unintentional isolation can be identified. To select the critical segment, a multicriteria decision technique is applied by considering the hydraulic, social and economic effect. Finally, the optimal valve locations and the number of additional valves is determined by pipe failure analysis through the trade-off relationship with the number of additional valves and the maximum damage under pipe failure situations. To verify the proposed technique, the real-world water distribution systems are applied and compared with the original design.
Highlights
In the past, the methods for improving water distribution systems (WDSs) have focused on providing more consumers with a stable water supply
This study proposes a framework for improving WDSs robustness: Optimal valve installation
To optimally install a valve, the priority segment to be divided is determined using the weighted utopian approach that considers the weights of each factor considered in the multicriteria decision techniques
Summary
The methods for improving water distribution systems (WDSs) have focused on providing more consumers with a stable water supply. Bruneau et al [1] introduced four elements associated with system resilience—robustness, redundancy, resourcefulness and rapidity (Table 1) Among these factors, robustness is the ability to maintain the required pressure during sudden changes in demand. Hashimoto et al [2] presented indicators (i.e., reliability, resiliency and vulnerability) for evaluating the conditions of a water resource system They anticipated that the indicators presented in their study would be useful in future water resource planning or management policies. They emphasized resilience as the degree to which the system can return to its previous normal conditions after its original function has been damaged by internal or external disturbance factors
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