This book contains concrete integrated themes covering vulnerability of water resources, wastewater technologies, modeling techniques, and blue and green energy resources. In its first section, it presents the vulnerability of water resources, including an assessment of the impact of heavy rains on treatment plants. It also discusses the vulnerability and risk impact of sea level rise. It concludes with a novel, practical solution to reduce water losses caused by climate change in major reservoirs. The second part covers a diverse range of integrated topics on wastewater technologies. It presents the wastewater industrial database nutrients, sustainable agriculture wastewater management, and a sustainable and green environment via Industrial wastewater management and pollution control. It also includes the design of an upgraded alternative to the existing wastewater treatment plant. The book discusses mobile water disposal and the recovery of critical minerals using a novel evaporation method. It synthesizes and characterizes styrofoam-based membranes for wastewater treatment applications, presents the effect of impeller partial shroud on centrifugal pump performance, and ends with an overview of centrifugal pump applications in wastewater treatment. The third part of the book discusses modeling techniques for water resources and their applications. The effect of the Manning coefficient in flood modeling was investigated. Also, water quality modeling was covered. Comparison of evaluating flood volume predictions using 1D and 3D models. This part concludes with the modeling of aquifer productivity and its applications. The fourth part of the book discusses blue and green energy resources, including ocean wave energy, with a focus on techniques, benefits, and challenges for a sustainable future. It also discusses the development of a desalination system using a geothermal heat source and the use of geothermal waters as a strategic source of critical raw materials. The assessment of the effect of hybrid floating breakwater geometry on hydrodynamic performance, including a contribution to producing sustainable energy using machine learning. The book features contributors with extensive experience from Egypt, Kuwait, Saudi Arabia, Italy, Slovakia, Bulgaria, China, and the United States, with a focus on SDG6, SDG7, and SDG13. The book is a fundamental source of information for all those interested in water management technologies, including postgraduate students worldwide, researchers, water engineers, and professionals in water technologies, modeling techniques, and blue and green energy resources.