The term 'stream dam' is a combination of two words: stream and dam. A stream is a body of flowing water, while a dam is a barrier built across a river or other body of water to control the flow of water. A stream dam is a type of dam that is specifically designed to control the flow of a stream. The most common type of stream dam is a WEIR, which is a low wall or barrier built across a river or stream to raise the water level or divert the flow.