This book contains a selection of the best articles presented at the 4th International Conference GIRE3D - Participatory and Integrated Management of Water Resources in Arid Zones, November 23th-25th , Help at Laayoune - Morocco, co-organized by Moroccan Committee of the International Hydraulics Association (CM-AIH) and Hydraulic basin agency of Sakia El Hamra and Oued Eddahab (ABHSHOD). It discusses the role of computational and geospatial technologies for water resources sustainable management and is intended primarily for professional, researchers, teachers and postgraduate students in fields that can benefit from geoinformation—both within and outside the areas of geographic information science, modelling and optimization.