👉 A cofferdam is a type of dam that spans multiple rivers, lakes, or other bodies of water. It is typically built by constructing two or more dams on one river and then connecting them to form a single dam, which can be used to control water flow in a floodplain area. The purpose of a cofferdam is to prevent flooding downstream by diverting the water from one side of the dam to another without causing significant damage to surrounding land. This technique is often used in areas