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    I have been revising how the characteristics of a river change from source to mouth but I’m a bit confused about velocity and deposition.

    I understand that as you go further downstream the velocity increases because tributaries add more water to the river channel and the river channel gets wider and deeper due to more erosion. This means that less water is in contact with the river bed and banks which means lesss friction so higher velocity. (I think this is correct)
    However what I don’t understand is why deposition increases as you travel further downstream. Surely if velocity is increasing then the river has more energy so should deposit less as it can carry a heavier load.

    If anyone could explain why the deposition increases downstream despite the velocity increasing I would really appreciate it.


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