The Heavy Rain in Northern Kyushu in July,2017 caused enormous flood disaster to the Akatani River. Although the river planning requires the stabilization of the flow, it is concerned the steep slope, numerous curved channels and falling works in this area cause turbulence and instability. To solve this problem, this research drafts the river planning by combing 2-D horizontal flow analysis and hydraulic model experiment. This research also aims to promote the initial work by opening the hydraulic experiment to the residents. Based on the experiment, shock wave caused by falling works and meandering flow caused by curved channels are the main reasons of this disaster. Therefore, the correction of the curve and lower height of the falling works can stabilize the flow conditions. Besides, the experiment can offer residents a visual understanding, which helps build the consensus.
