Although dams, not only those built for the generation of electricity but also those designed for flood control, irrigation, water supply, or a combination of these purposes, have delivered significant benefits, they have often been the cause of disastrous social upheavals and major negative environmental impacts, and their construction has serious geographic limitations. | Although dams, not only those built for the generation of electricity but also those designed for flood control, irrigation, water supply, or a combination of these purposes, have delivered significant benefits, they have often been the cause of disastrous social upheavals and major negative environmental impacts, and their construction has serious geographic limitations. |