The velocity of a river would increase if the gradient increased.
What is velocity?
"Velocity is the directional speed of a object in motion as an indication of its rate of change in position as observed from a particular frame of reference and as measured by a particular standard of time."
What is Stream Gradient?
- The stream gradient is the downhill slope of the channel.
- Gradients are typically the lowest at a river's mouth, and highest at its headwaters.
- The higher the gradient, the faster the stream flows.
- The shape and roughness of the channel also affect the velocity of the flowing water.
To learn more about the stream here
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