A diversion dam is a type of dam that is built across a river. It is used to change the path of the river by diverting some of the river water into a canal, reservoir, or other waterway for a particular purpose. This could be for irrigation, providing drinking water, or generating electricity. The diverted water is then guided through the dam's gates, which control the amount of water flowing downstream. This kind of dam is different from a traditional dam, which normally stores water in a reservoir.