Discharge, Q, is a measure of the volume rate of flow (m3/s) through a stream cross-section. Discharge is the rate of flow in a particular channel reach, which in turn is affected by precipitation events occuring in the watershed of the channel reach, as well as topography, vegetation and soil type.

Discharge, Q, is a product of the cross-sectional area of flow, A, and the average velocity, V, in that cross-sectional area of flow, Q = A * V

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