Irrigation, as the biggest water user in most regions of the world, is facing significant challenges in balancing social, economic and environmental needs for water. These proceedings of the 5th International Conference on Sustainable Irrigation and Drainage: Management, Technologies and Policies provide examples of how irrigation and drainage can become more sustainable, while acknowledging that the concept of sustainability is a goal that continues to change as our knowledge of the biophysical realities alters. In that sense, moving towards sustainability is an ever-evolving journey. The focus is on the implications for improving sustainability, whether this is drainage, irrigation technologies, economic modelling, governance studies for irrigation management, reuse of water, or any other aspect. Topics covered include: Irrigation Management; Irrigation Systems and Planning; Climate Change Effects; Groundwater Issues; Socio-economic Benefits.