Experts predict that by the end of the 21st century, over 80 percent of the world’s population will be concentrated in urban areas. An increasing number of urban poor will rely on urban waterways for recreation, food, and escape from urban pressures. Today's urban water problems are difficult to see without knowledge of watershed processes and the impacts of human development. This documentary is a journey across three continents to look at three watersheds and the problems they are facing. From the Series:Urban Water: Sustainability in the Balance