Identification of highly erodible lands criteria.

CFR · 2024-01-01 · US · Title 7

(a) (1) The potential average annual rate of sheet and rill erosion is estimated by multiplying the following factors of the Universal Soil Loss Equation (USLE): (i) Rainfall and runoff (R); (ii) The degree to which the soil resists water erosion (K); and (iii) The function (LS), which includes the effects of slope length (L) and steepness (S). (2) The potential average annual rate of wind erosion is estimated by multiplying the following factors of the Wind Erosion Equation (WEQ): Climatic characterization of windspeed and surface soil moisture (C) and the degree to which soil resists wind erosion (I). (3) The USLE is explained in the U.S. Department of Agriculture Handbook 537, “Predicting Rainfall Erosion Losses.” The WEQ is explained in the paper by Woodruff, N.P., and F. H. Siddaway, 1965, “A Wind Erosion Equation,” Soil Science Society of America Proceedings, Vol. 29. No. 5, pages 602-608. Values for all the factors used in these equations are contained in the NRCS field office technical guide and the references which are a part of the guide. The Universal Soil Loss Equation, the Revised Universal Soil Loss Equation, and the Wind Erosion Equation and the rules under which NRCS uses the equations are published at §§ 610.11 through 610.15 of this title. (b) (c)

official document · source cfr-2024 · id 7:§ 12.21