The book Bennett 1939 and Norton 1939 provides a classification of eroded soils. (6 classes are given below). Please tell me if there are more modern classifications and related literature? Are there alternative methods for determining the degree of soil washout (reduction of humus horizon or soil carbon)?
1. Less than 25 percent of the topsoil removed. Erosion of class 1 is mapped if the effects of erosion can be identified but the average removal has been less than 25 percent of the thickness of the original topsoil.
2. 25 to 75 percent of the topsoil removed. If the thickness of original topsoil was about 16 inches and the present topsoil is between 4 and 12 inches, sheet erosion of class 2 would be mapped.
3. 75 percent or more of the topsoil removed, or all the topsoil and less than 25 percent of the subsoil * removed.
4. All the topsoil and 25 to 75 percent of the subsoil removed.
5. All the topsoil and 75 percent or more of the subsoil removed; parent material may be eroded.
6. The symbol 6 is reserved for conditions of local significance, such as slips or catsteps. Slips too small to be outlined on a map may be indicated by a crescent-shaped symbol, as shown on plate 5.
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