organizations and their respective power distributors; and recreational groups such as anglers, kayakers, and rafters that depend on Colorado River water.

This report is organized into six chapters. Following this introductory chapter, Chapter 2 reviews historical events as well as laws, agreements, compacts, and judicial rulings affecting the use of Colorado River water. Chapter 3 discusses important climatic and hydrologic features, data, and methods that underlie the scientific bases of Colorado River water management decisions. Chapter 4 reviews the prospects for extending water supplies via several possible technical and other means. Chapter 5 reviews prominent organizations and programs in the Colorado River region focused on drought detection, response, and mitigation. Chapter 6 offers final reflections on the contents of this report and on adjusting to aridity in the western United States.

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