In relation to rivers, potential or (stored) energy is fixed by the altitude of the source of the stream in relation to base level.
Kinetic energy, or energy due to movement, is generated by the flow of the river which converts potential energy into moving energy. The amount of kinetic energy is determined by the volume of flowing water (discharge), the slope or channel gradient down which it is flowing and its average velocity. An increase in velocity and/or discharge results in an increase in kinetic energy.
All channel processes are dependent on the amount of energy available. This is a delicate balance. If there is excess after transportation of load the river will erode, but if energy is insufficient to move the load deposition will occur. The river channel adjusts in shape and size to accomadate changes in the volume of water and sediment.
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