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

• 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.
• River courses may be modified to improve navigation, or straightened to increase the flow rate.