Soil Erosion.
Soil erosion is a process by which topsoil is gradually removed (carried away) from one place, transported and then deposited to another place by the action of water, wind, animals and human beings.
Gully Erosion
Gullies are long deep ditches with steep sides.
They are mainly formed on steep slopes where rill erosion has taken place for a long time.
As the runoff flows down the slope, it widens and deepens the rills, thus creating deep ditches called gullies.
Unlike the rill, gullies are not easy to remove by means of normal cultivation using farm tools such as hoes and jembes because of their great depth.
However, farmers can use structures such as gabions built across the gullies which helps to slow down movement of water and its force and they also help to trap soil particles which remain behind as water passes slowly through them.
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