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. | Source: Earthlabs

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