The term MOSEL FEEDER is a job description for someone who works in the wine industry. Specifically, it refers to a person who is responsible for feeding the Mosel River with water from the Saar River. The Saar River is a tributary of the Mosel River, located in Germany and Luxembourg. The job of a Mosel Feeder is to ensure that the Mosel River has enough water to support the vineyards along its banks.