PLANNING PROCESS FOR COMMUNITY BASED GREEN INFRASTRUCTURE IMPLEMENTING IN SMALL WATERSHED OF URBAN AREA

Abstract

The purpose of this study is to show the knowledge of the method to develop the regional vision by applying the green infrastructure collaborated with local residents in the small watershed of urban area. In a study with local residents in the Nakahori River, Yokohama City, the following steps were performed: classification of subwatersheds and understanding of the flow direction of surface water, estimation of land use diversions and rainwater runoff and their changes, creation of an interest map that summarizes the location of sewerage systems, flood hazard maps, and citizens’ interests, and creation of a vision for the adoption of green infrastructure in the region and action points. As a result, it is considered that a) a visualization method to superimpose the water cycle and local issues at the scale of a local sub-watershed, b) environmental design of the sub-watershed through understanding the flow of surface water, and c) a verification process to set goals according to the interests of local residents, are important for the collaborative planning process of green infrastructure.