Rill erosion occurs in places where continuous sheet erosion has taken place.
In such places, the runoff carrying particles concentrates in small channels or rills down a slope.
Several small rills join to form a large rill.
As runoff flows along the rills, soil is eroded on the sides and the bottom of the rills.
The rills can reach a depth of up to 30 cm.
Rill erosion can be observed when a freshly cultivated land experiences heavy rainfall immediately after cultivation.
However, the rills can easily be removed during normal cultivation of land using farm fools such as hoes and jembes.
Rills can also be observed on over-grazed land as well as on paths created due to frequent movement by humans or animals.
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