A NEW FLOOD CONTROL METHOD BY DAM GATE OPERATION BASED ON RUNOFF CHARACTERISTICS OF A BASIN FOR THE IMPROVEMENT OF FLOOD MITIGATION EFFECTS OF A DAM

Abstract

  A new method of flood control by dam gate operation based on runoff characteristics of a basin and nticipatory release is proposed in this paper. In order to consider the several limitation conditions related to the law, capability of discharge gate and flood condition at down stream of river, preparation time for the gate operation and increase rate of river water level at the target points were taken into account as the anticipatory release. It was found, that it is necessary to reduce the preparation time in operating the gate, as an effective flood mitigating measure. Further more, reservoir stage can be recovered to the normal water level after flood event by the use of anticipatory release considering the initial loss for the initial reservoir stage which is lower than normal water level before flood event.