This book includes the select, peer-reviewed proceedings from the 21st Technical Dam Control International Conference, providing a comprehensive exploration of developments and critical discussions in hydraulic engineering. This collection of research and expert findings included here focus on the issues and technologies in hydraulic structures design, safety, and sustainability. The book includes key thematic areas such as safety, geotechnics, maintenance, operation technologies, wet landfills, renewable energy, climate change, environmental impact, and urban hydraulic engineering. The book covers methodologies for ensuring the safety and reliability of dam structures. It also highlights the latest advancements in construction technologies and their impact on the efficiency and resilience of water-related projects. Significant emphasis is put on the environmental implications of hydraulic structures, particularly concerning climate change and sustainable development practices. The book offers valuable insights into urbanized areas water retention strategies and hydraulic engineering challenges. With contributions from scholars and practitioners, this book provides a resource for professionals, researchers, and policymakers involved in hydraulic engineering and environmental management. It not only captures the fields current state but also provides a forward-looking perspective on innovation and sustainability.