This slope near the summit is a gift to geomorphology lecturers. Inclined at ~40° from horizontal, it's not far from being an idealised flat plane with most complicating factors absent (or uniform). Rain falling on this surface would (theoretically) flow off as a uniform sheet at first, developing into channelised flow according to tiny surface irregularities and fundamental fluid dynamics. From there, weathering gives a complex dendritic (tree-like) stream network.
Though the rills in the centre foreground are only tens of centimetres long, they strongly resemble gullies (each tens of metres long) I've seen in Northern Spain or aerial views of valleys (hundreds of metres long) in the Howgill Fells, ~20 km north-east from here.
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