Flood control is an important part of civil engineering and involves the use of various methods to reduce the risk of flooding. Two common methods of flood control are levees and dams. Levees are structures built along rivers or coasts to prevent flooding by blocking the water from entering the area. Dams are structures built across rivers to control the flow of water and reduce the risk of flooding. Both levees and dams are used to protect people and property from the effects of flooding.