Description of the term: Reservoir
A?reservoir?is, most broadly, a place or hollow vessel where something (usually?liquid) is kept in?reserve, for later use. Most often, a reservoir refers to an?artificial?lake, used to store?water?for various uses. Reservoirs are created first by building a sturdy?dam, usually out of?cement,?earth,?rock, or a mixture. Once the dam is completed, a?stream?is allowed to flow behind it and eventually fill it to capacity.