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On steep and rough sections braiding occurs and
erosion is widespread
water is the principle agent of erosion even in this dry state and water exploits steep slopes
some erosion is natural and generally not obvious
when the effects of erosion can be seen, it has reached an unacceptable level and should be controlled
steep tracks capture and concentrate natural water flow
For example, these three photos are sections of the same track subject to same traffic and rainfall
  Many tracks are in biodiverse regions ...