This report presents the results of a collaborative research project which aimed to exhibit an urban flood risk reduction strategy that solves urban drainage problems by managing solid debris derived from anthropogenic and natural activities, through administrative services on sewage and drainage clearing, waste collection, and citizen’s cooperation to waste disposal. A flood often occurs after a high intensity of precipitation in the urban area is mainly caused by comparably low drainage capacity. One of the common causes of urban flood in Asian cities is said to be the blockage of drainage by inappropriate disposal of solid waste. In order to remove barriers to urban drainage function, preventing factors, both from physical and social perspectives, must be identified and removed accordingly. Considering this, the project identified the amount and composition of solid wastes that potentially clog drainage system and proposed a science-based guidance on periodic maintenance of drainage system for public service. Furthermore, institutional and psychological factors that inhibit residents and businesses to dispose waste properly were assessed, and suggestions to improve the current waste management system/policies were recommended.