Definition:
1) Body of water, generally flowing in a natural surface channel.
2) Water flowing in an open or closed conduit, a jet of water issuing from an orifice, or a body of flowing groundwater. Typically smaller than a river.
Source:
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Food and Agriculture Organization of the United Nations, AQUASTAT Web Site
UNESCO/WMO,1992, International Glossary of Hydrology, 2d edition