Abstract
A new flood control concept called 'Cascade method' which permits a dam to overflow from an emergency spillway around an upstream region with plural dams set in series in a river basin has been suggested. In this study, characteristics of the new flood control method are investigated for various inflow flood hydrographs whose shape is transformed systematically. As a result of this study, it is made clear that the new method can control more effectively for leaning forward inflow hydrographs. In addition, we propose another new type of a dry dam to encourage water-utilization. The new type has an outlet work for flood control with a slide gate which can be closed automatically depending on hydraulic pressure or buoyancy. We call this gate 'pressure gate'. The new type of dry dams constructed in series with a pressure gate strengthens still more flood control capability of the Cascade method.
