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In a stream or river, the flow of water derived from the seepage of groundwater, and/or throughflow into the surface watercourse. At times of peak river flow, baseflow forms only a small proportion of the total flow, but in periods of drought it may represent nearly 100%, often allowing a stream or river to flow even when no rain has fallen for some time. See also interflow; and subsurface flow.

Subjects: Earth Sciences and Geography.

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