In recent years, abnormal heavy rains have caused serious inundation damage beyond the river maintenance plan. In the Hozu River in Kameoka City, Kyoto Prefecture, flood damage is inevitable not only along the main river but also in the tributary areas due to the narrowing of the Hozu Gorge and haze embankment, and improving the flow capacity of the main river alone will not eliminate the flood risk in the region. This proposal will clarify the rainwater regulation function of farmland and green areas in the Kameoka River East area, restructure the water network to create a regulating reservoir, restore the wet floodplain ecosystem, and create new industries and values by inheriting the local climate, while maintaining and improving the original landscape of the Kawahigashi area.