Base Flow (1) The flow that a perennially flowing stream reduces to during the dry season. It is supported by groundwater seepage into the channel. (2) The fair-weather or sustained flow of streams, that part of stream discharge not attributable to direct runoff from precipitation, snowmelt, or a spring. Discharge entering streams channels as effluent from the groundwater reservoir. (3) The volume of flow in a stream channel that is not derived from surface run-off. Base flow is characterized by los flow regime (frequency, magnitude, and duration daily, seasonally, and yearly), by minimum low flow events and in context of the size and complexity of the stream and its channel.
Source: http://www.bvsde.paho.org/bvsacg/i/fulltext/dicciona/dicciona.pdf
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Author of the Water Words Dictionary source of text: Gary A. Horton
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