This interdisciplinary volume examines how nine arid or semi-arid river basins with thriving irrigated agriculture are doing now and how they may change between now and mid-century. The rivers studied are the Colorado, Euphrates-Tigris, Jucar, Limarí, Murray-Darling, Nile, Rio Grande, São Francisco, and Yellow. Engineered dams and distribution networks brought large benefits to farmers and cities, but now the water systems face multiple challenges, above all climate change, reservoir siltation, and decreased water flows. Unchecked, they will see reduced food production and endanger the economic livelihood of basin populations. The authors suggest how to respond to these challenges without loss of food production, drinking water, or environmental health. The analysis of the political, hydrological, and environmental conditions within each basin gives policymakers, engineers, and researchers interested in the water/sustainability nexus a better understanding of engineered rivers in arid lands.

The drylands region shared by the United States and Mexico currently faces multiple sustainability challenges at the intersection of the human and natural systems. Warming and drying conditions threaten surface water and groundwater availability, disrupt land- and marine-based livelihood systems, and challenge the sustainability of human settlements. These biophysical challenges are exacerbated by a highly mobile and dynamic population, volatile economic and policy conditions, increased exposure to extreme events, and urbanization on marginal, vulnerable lands. The U.S. National Academies of Sciences, Engineering, and Medicine collaborated with the Mexican Academy of Sciences, Academy of Engineering, and the National Academy of Medicine to plan a 2-day binational workshop, Advancing Sustainability of U.S.-Mexico Transboundary Drylands. The workshop goals were to highlight the challenges facing the region, assess the scientific and technical capacity that each nation can bring to bear in addressing these challenges, and identify new opportunities for binational research collaboration and coordinated management approaches in the advancement of sustainability science and development. This publication summarizes the presentations and discussions from the workshop.

The system of the Tigris-Euphrates Rivers is one of the great river systems of southwestern Asia. It comprises the Tigris and Euphrates Rivers, which follow roughly parallel courses through the heart of the Middle East. The lower portion of the region that they run through is known as Mesopotamia, was one of the cradles of civilisation. There are several environmental factors that govern the nature of the two rivers and shape the landscape the two rivers running through. Geological events create rivers, climate monitor the water supply, the surrounding land influences the vegetation and the physical and chemical features of water. The Tigris-Euphrates system runs through the territory of four countries, Iraq, Iran, Turkey and Syria. Therefore, any scientific approach to the environment of these two rivers should include the natural history events in these countries. The book "Tigris and Euphrates Rivers: Their Environment from Headwaters to Mouth" will be divided into nine parts. These parts deal with the issues of the environment, the status of the flora and fauna, the abiotic aspects, ecology, hydrological regime of the two rivers, the biotic aspects. Water resources, stress of the environment, conservation issues. Since the book of Julian Rzoska "Euphrates and Tigris Mesopotamian Ecology and Destiny" in 1980, no book or major reference has been published that includes between its cover the facts and information that the present book will present. Therefore, the importance of the present book falls in stating the present status of the environment of the two rivers and the comparison of their environment between now and that of 37 years ago as given by J. Rzoska (1980). The recent studies showed that there are a large number of natural and political events that happened within the last three decades in the area of the Tigris-Euphrates river system that for sure have done a great change to the environment of the two rivers and consequently changing the biological and non-biological resources of the two rivers. This book will be a reference book to both Academic and students across the Middle East in different disciplines of knowledge to use in their researches on Tigris-Euphrates river system. The scholars interested in this area will use this book as a guide to compare this freshwater system with other areas in Asia and the world.

This book includes the papers presented in International Conference on Advanced Science and Engineering 2019 (ICOASE2019), which held in Duhok, Kurdistan Region-Iraq, on April 2-4, 2019. The conference is organized by both the University of Zakho and Duhok Polytechnic University. The conference, and consequently these proceedings, aimed to give more concrete expression to the natural sciences and engineering applications with a new multilateral scientific forum that emphasizes the vulnerability and proactive remediation from an Earth and Environmental point of view. This book covers a wide range of questions and gives advanced themes on current research focusing on emerging environmental issues and challenges in chemistry, biology, physics, and related areas in geoscience with their applications.

Ethiopians had to wait over a thousand years to be able to use their waters for their own development. Ethiopian emperors and leaders have tried to build a dam on the Nile River as part of their development efforts. Unfortunately, due to varying reasons and circumstances, including external pressure from countries near and far, geo- and hydro-political balance shifts, and internal conflicts, they were not successful in realizing their wishes. Instead of giving up, though, each leader contributed to different extents, by laying the foundation for and addressing challenges faced in making this dream a reality. The masterplan for the dam designed in 1964 has been the seed in waiting ever since, waiting for the right opportunity to arise for construction to start. Following the decade long negotiation and an agreement on the equitable use of the Nile waters by most Nile riparian countries, and the subsequent Cooperative Framework Agreement, the Ethiopian government started the construction of the GERD in 2011. The waiting had finally ended ... It was time for the seed to grow. Twelve years later, the construction program is almost done. The reservoir already holds billions of cubic meters of water, and the country has produced power from the first two turbines as part of the early power generation milestone. The seed has sprouted, and the tree is on track to be the tallest in Africa. In this six-part book, Dereje Befekadu Tessema discusses events that started thousands of years ago, culminating in the construction of the Grand Ethiopian Renaissance Dam (GERD). He also shares a recount of his trip from the sources to the mouth of the Nile River.

Arid and semi-arid regions face major challenges in the management of scarce freshwater resources under pressures of population, economic development, climate change, pollution and over-abstraction. Groundwater is commonly the most important water resource in these areas. Groundwater models are widely used globally to understand groundwater systems and to guide decisions on management. However, the hydrology of arid and semi-arid areas is very different from that of humid regions, and there is little guidance on the special challenges of groundwater modelling for these areas. This book brings together the experience of internationally leading experts to fill a gap in the scientific and technical literature. It introduces state-of-the-art methods for modelling groundwater resources, illustrated with a wide-ranging set of illustrative examples from around the world. The book is valuable for researchers, practitioners in developed and developing countries, and graduate students in hydrology, hydrogeology, water resources management, environmental engineering and geography.

Examines the environmental element of managing the international water resource of the Nile.