Recently, it becomes serious problem to keep the balance in water resources between water supply and demand to prevent for shortness of water. There are several approaches, such as the construction of dam reservoirs, the reduction of water use, the reuse of wastewater, and the conjugative use between groundwater and surface water. However, it is difficult to estimate the safety of water resources system with necessary accuracy because of uncertainty in water quantity and quality. So, in this paper, we try to establish the comprehensive estimation procedure by using the three criteria, such as reliability, resiliency and vulnerability. Then, they are evaluated under the condition of conditional input data in time and space. Moreover, water resources system is optimized on the basis of their criteria.
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