Abstract
Summary Observations on steep slopes in Rwanda reveal that human interventions on surficial drainage can introduce gullying on places where runoff normally leads to diffuse or ephemeral rill erosion. In such cases, an initial runoff incision or slide scar, respectively due to an artificial concentration of runoff or underflow, grows in downslope direction, mainly by runoff incision. This type of progressive or forward gully development contrasts with the more classical regressive development, here only observed in places where the flow gradient is less than 7°–8°.
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