A Designated Use is classification specified in water quality standards for each waterbody or segment describing the level of protection from perturbation afforded by the regulatory programs. The designated aquatic life uses established by the state or authorized tribes set forth the goals for restoration and/or baseline conditions for maintenance and prevention from future degradation of the aquatic life in specific waterbodies.
Other /More definition:
A Designated Use is Classification designated in water quality standards for each waterbody or segment that defines the optimal purpose for that waterbody. Examples - drinking water use and aquatic life use.
List of books: Designated,Use