Considering the recent trend of climate change and increased flood risk from urbanization, it is necessary to prepare for floods when developing a riverside city. Both of the national pilot smart cities in South Korea are located along the river, but the flood management technique based on the characteristics of smart city remain insufficient. This study presented flood management techniques for smart cities around rivers from urban planning perspective through the analysis of characteristics of domestic and foreign smart cities and applied the technique to the Busan Eco Delta Smart City as a pilot study. The study results confirmed the feasibility of the technique in smart city development in consideration of flood risk, which would help towards an effective and efficient flood reduction planning. Although the applicability of the technique in land use and building projects has been confirmed in this study, further review would be needed for the creation of housing complex and building adaptation.