Comprehensive approach to realize the "Low Carbon Society, Sound Material-Cycle Society, and Society in Harmony with Nature" is an issue of regional and city planning. The planning method based on watershed unit is one of the important topics to solve both global environmental problems and local problems on the ecosystem, cultural landscape, and disaster prevention and has been introduced in the Master Plan for Parks and Open Spaces of some municipalities in Japan. The small watershed unit is introduced to share the future vision based on scientific data, water cycle and biodiversity. Some municipalities show the model of eco-harmonized city in the district scale based on small watershed unit. The purpose of this paper is to clarify the needs and problems of the watershed planning to manage the park and open spaces. The study area is Sendai metropolitan area, the Tohoku District, Japan. First, we mapped small watershed of Sendai city and analyzed the characteristics of natural environment, and their policy by the small watershed unit. Second, the relationship between the characteristics of small watershed and actual condition were clarified.
