An off-stream reservoir is a reservoir that is not located along a natural watercourse and is instead supplied by a pipeline, aqueduct or the redirection of adjacent watercourse. An off-stream reservoir may also serve as dry reservoirs, that is, they assist with flood mitigation and do not hold water until such time as a major flood event occurs. Most off-stream reservoirs are impounded by embankment dam walls made from rock-fill or earth-fill.
Off-stream reservoirs may assist in limiting the ecological impact of a reservoir.
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