Young Blonde Girl Shows Off On Rocks At The River In The Forest

Rivers are often managed or controlled to make them more useful, or less disruptive, to human activity.
• Dams or weirs may be built to control the flow, store water, or extract energy.
• Levees, known as dikes in Europe, may be built to prevent river water from flowing on floodplains or floodways.
• Canals connect rivers to one another for water transfer or navigation.