This study aims to exhibit an urban flood risk reduction strategy which 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. The flood that often happens after the high intensity of precipitation in the urban area is mainly caused by the lack of drainage capacity. On top of that, one of the common causes of the urban flood in Asian cities is said to be the blockage of drainage by improper 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. For this, this study identifies the amount and composition of solid wastes that potentially clog drainage system, and science-based guidance on periodic maintenance of drainage system for public service will be proposed. Furthermore, institutional and psychological factors that inhibit residents and businesses to dispose of waste appropriately will be clarified, and suggestions to improve the current waste management system/policies will be proposed. All activities will feed into the policy for Bangkok, Thailand and Hue, Vietnam, by closely collaborating with local stakeholders and researchers throughout the project.