The document discusses methods of flood control and river management. It describes various causes of flooding such as heavy rain, urbanization, dam collapse, and snow melt. Common flood control techniques include building dams and pumping stations, barriers, altering river channels, and controlling land use near rivers. The Mississippi and Nile Rivers are discussed as examples, noting large levee systems on the Mississippi and the Aswan High Dam on the Nile, which was built to control flooding but caused environmental issues.