Erosion

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The process whereby water or wind moves soil from one location to another. Types of erosion are (1) sheet and rill – a general washing away of a thin uniform sheet of soil, or removal of soil in many small channels or incisions caused by rainfall or irrigation run-off; (2) gully – channels or incisions cut by concentrated water run-off after heavy rains; (3) ephemeral – a water-worn, short-lived or seasonal incision, wider, deeper and longer than a rill, but shallower and smaller than a gully; and (4) wind – the carrying away of dust and sediment by wind in areas of high prevailing winds or low annual rainfall.