1. SHEET EROSION: Removal of thin layer of soil from a large area.
2. RILL EROSION: A series of small channels on a slope carved by running water
3. GULLY EROSION: Large, wide channels carved by running water. As a rule of thumb, a gully is large enough that it cannot be smoothed out with conventional tillage equipment.
4. SPLASH EROSION: Direct movement of soil by splashing. Soil particles can be thrown as far as 3 feet by raindrop splash.