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Capacity The total load that a river can transport at a given point

Competence The maximum size of a load a river is capable of transporting

At low velocity only fine particles may be transported: clay, silt and fine sands

At high velocity larger particles may be transported: gravel,…

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The Hjulström Curve
The Hjulström curve illustrates the relationship between velocity and competence.

It shows the velocities at which sediment will normally be eroded, transported or deposited.

Mean or critical erosion velocity Shows the velocity required to pick up and
transport sediments of various sizes

Mean fall or settling velocity…


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