This book provides a detailed description of fluvial processes and their influence on urban sites. During the urban expansion of modern cities throughout the twentieth century, rivers have become a source of problems during high flood events. However, due to growing social pressure, especially in dense cities, rivers are viewed as new leisure areas given that they also provide highly valuable ecosystem services. People seek open and environmentally friendly spaces amidst the dense street networks of cities. Yet, we should not forget that rivers are not merely domesticated elements of nature for leisure purposes only. Flooding risks and damages are possible within urban environments. How should we address the social and ecological interactions? How should we plan for these complexities to meet the growing social requirements and needs while respecting river dynamics? Hydrologists, geomorphologists, engineers, geographers and urban planners could leverage the knowledge and examples provided to enhance the interaction between nature and society in the growing cities of the twenty-first century.