INTEGRATED WATERSHED MANAGEMENT TO SECURE INSTREAM FLOW OF URBAN STREAM, KOREA

摘要

A systematic, seven-step approach to general integrated watershed planning and management was applied to the Anyangcheon watershed in Korea, which experiences streamflow depletion, frequent flood damages, and poor water quality typical of highly urbanized watersheds. To identify and quantify problems within the watershed, four indices were employed: Potential Flood Damage (PFD), Potential Streamflow Depletion (PSD), Potential Water Quality Deterioration (PWQD), and Watershed Evaluation Index (WEI). Composite programming, a method of multi-criteria decision making, was employed to estimate WEI to make an integrated appraisal of watershed considering other three indices. As a result, the primary goal is to secure instream flow during dry seasons. Some management options which are technically, economically, and environmentally feasible, are selected. Using Soil and Water Assessment Tools (SWAT), a physically-based and distributed hydrologic simulation model, those options are tested for the analysis of the effectiveness. Finally, the priority ranking of alternatives was proposed. This study addresses the construction of decision support system for the integrated watershed management in the future.