A '''reservoir''' is an [[artificial]] [[lake]] used to store [[water]]. Reservoirs may be created in [[river]] valleys by the construction of a [http://en.wikipedia.org/wiki/Dam dam] or may be built by excavation in the ground or by [[conventional]] construction [[techniques]] such as brickwork or cast concrete. | A '''reservoir''' is an [[artificial]] [[lake]] used to store [[water]]. Reservoirs may be created in [[river]] valleys by the construction of a [http://en.wikipedia.org/wiki/Dam dam] or may be built by excavation in the ground or by [[conventional]] construction [[techniques]] such as brickwork or cast concrete. |