We suggest a new flood control concept called 'Cascade method' which permits a dam to overflow around an upstream region with plural dams set in series in a river basin. We recommend plural small scale dry dams set in series instead of a large scale dam in order to prevent flood disaster and preserve a natural environment. In this study, the new flood control concept is applied to single and double peak flood events in a numerical simulation. Under the condition of common reservoir capacities, new flood control method permitting upstream dams to overflow except for a downstream dam is compared with the conventional one not to overflow in each dam. In addition, appropriate design high water discharges for plural dry dams are investigated. As a result of this study, it is made clear that the new method is more effective than the conventional one for double peak flood events as well as for single ones, and uniform design high water discharge for each dry dam is practically appropriate in the Cascade method.
