Abstract
The local heavy rains that didn't happen in the past, super typhoon and local torrential rainfall, generates more rainfall than the design rainfall applied to the design of the hydraulic structure this raises the anxiety about safety from natural disasters. In this study, the risk was analyzed extreme rainfall for a small dam belonging to a relatively large-scale structure among hydraulic structures and The target of analysis is the Cheongsong pumped storage plant in Cheongsong, Gyeongsangbuk-do. In Korea, extreme rainfall occurs mainly in the Jirisan area of the south coast and the east coast area. Therefore, in this study, the extreme rainfall that occurred in the eastern coastal area near the Cheongsong pumped-water power plant was selected and used for analysis. The maximum daily rainfall since 2000 in the east coast area was Typhoon Mitag in 2019, which caused a lot of rainfall in the east coast areas such as Pohang, Yeongdeok, and Uljin. In this study, it was assumed that rainfall such as typhoon Mitak occurred in the basin of the Cheongsong pumped storage plant, and the effect of dam outflow according to power generation on the downstream area was analyzed.
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