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A river in a deep, broad channel, often with a gentle gradient and small bedload, will have a greater/lesser velocity than a river in a shallow, narrow, rock filled channel – even if the gradient of the latter is steeper.
The velocity of the river increases/decreases as it nears the sea
The velocity increases/decreases as the depth, width and discharge of a river all increase.
As the roughness increases/decreases, so does turbulance and the ability of a river to pick up and transport sediment.