Abstract
When an extreme flood event beyond the scale assumed in the flood control plan occurs at a dam site retaining a flood control capacity, so-called “proviso operation (extreme-flood control operation of dams)”, in which the discharge volume is increased significantly to balance the inflow is usually implemented. However, lowering the flood prevention effect of the dam and being not able necessarily to utilize the remaining capacity of the dam remain in the technique as challenges to be solved. In the case of such an extreme flood event, use of the V-R method is considered effective, in which water is discharged with the remaining capacity taken into account. In this study we simulated the use of the V-R method by using the past data. As a result, the effectiveness of the method was verified and the problems it involves were identified. Reasonable methods of application were also proposed.
