In March 2022, Japan’s first movable flood barrier was completed to address overflow issues in the Katsura River Arashiyama area, a designated national historic and beauty site. This study aims to elucidate the process undertaken by the Katsura River Arashiyama Area River Improvement Study Committee, the evolution of issues in consensus-building between residents and the administration, and the formulation of countermeasure proposals, through an analysis of the committee’s materials. The following results were obtained: (1) Eight evaluation criteria crucial for preserving landscape values were identified, and the specific content of these values at each study stage was clarified. (2) To foster consensus with residents, landscape values to be preserved and study details were communicated through various visual representations, including photomontages and on-site model verification. (3) The process entailed sharing detailed discussion points and countermeasure proposals with local residents, proposing flood control measures aligned with landscape values, and flexibly responding to and considering consensus-building efforts by the administration.