Hydropower is the power derived from the energy in moving water. Hydroelectricity is created by converting the kinetic energy in moving water to mechanical energy in turbine machinery, which is then used to generate electricity. In this book, the authors present current research in the study of the types, development strategies and environmental impacts of hydropower. Topics discussed include the history and present state of global hydropower development and engineering and types of hydropower structures; and a study of hydropower as a renewable and environmentally friendly energy source.