Abstract
The flood control and water use of multipurpose dams have been drawing attention as one of the adaptable measures against climate change. At the same time, there are concerns about the ability of multipurpose dams in cold, snowy regions to control heavy rain during the snowmelt season, when the impounding of service water is prioritized and the flood control capacity is small. Toward improving the flood control capacity of such dams, this study examines the possibility of releasing dam water based on weather forecasts before heavy rain. First, the forecasted cumulative rainfall was compared with the forecasted time series rainfall in terms of accuracy, and the former was found to be more accurate. Next, a method for dam water release before heavy rainfall based on the forecasted cumulative rainfall was proposed, and the method was applied to a past flood during the snowmelt season. Utilization of the forecasted cumulative rainfall was found to be effective in improving the flood control of dams during the snowmelt season. The study results further suggest that it will be possible to put emphasis on flood control in managing multipurpose dams during the snowmelt season.
