As water in the stream channel flows, it encounters friction; the friction slows the forward movement. The shape,size, and roughness affect the amount of friction. High friction slows the stream significantly.
An increase in stream velocity can be due to factors such as a steeper gradient, higher discharge, narrower channel width, or decreased channel roughness. These factors can contribute to higher flow velocities in rivers or streams.
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Because of the high altitude, these winds are not subject to much friction, hence they are faster than winds closer to earth's surface.
Stream velocity is dependent of four things. They are, the flow type, the gradient, the channel shape, and the discharge of the stream. Streams will flow faster in narrow channels on steeper grades.
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jet streams
When their velocity decreases
Jet Streams.
When the discharge of a stream increases, so does it's velocity. When it decreases, so does the velocity.
jet streams!! :D
Jet streams
Jet streams