Young Blonde Girl Shows Off On Rocks At The River In The Forest

Volumetric flow rate, also called discharge, volume flow rate, and rate of water flow, is the volume of water which passes through a given crosssection of the river channel per unit time. It is typically measured in cubic meters per second (cumec) or cubic feet per second (cfs), where 1 m³/s = 35.51 ft³/s; it is sometimes also measured in litres or gallons per second.
Volumetric flow rate can be thought of as the mean velocity of the flow through a given crosssection, times that crosssectional area. Mean velocity can be approximated through the use of the Law of the Wall. In general, velocity increases with the depth (or hydraulic radius) and slope of the river channel, while the crosssectional area scales with the depth and the width: the doublecounting of depth shows the importance of this variable in determining the discharge through the channel.

