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To achieve economic efficiency in a basin flood mitigation planning, it is important to determine optimal sizes of investment alternatives. Investment alternative means decision proposals composed with one more individual proposals, and it is not easy to determine an optimal one because there are so many individual proposals. This study aims to propose the approach of determining the optimal project size for raising dam height. This study applies two scenarios to determine investment alternatives for the 4 dams in the Yeongsan River basin.‘Scenario1’calculates flood mitigation for each individual proposal. And‘Scenario2’calculates that for each investment alternative composed with one more individual proposals. As the results,‘Scenario2’is better than‘Scenario1’for selecting a economically optimal dam height considering watershed conditions comprehensively.

han-guk jiri jeongbo hakoeji/han'gug ji'ri jeongbo haghoeji/han'gug ji'li jeongbo haghoeji

Optimal Size Determination of Flood Mitigation Facilities in a Watershed Using Geo-Spatial Information System and Economic Analysis: Focused on Dam Height Raise Project