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• Section 780.18(b) Continued. <br />Wind Erosion Control <br />Kerr Coal is keenly aware of the concern for proper erosion control <br />between the time the topsoil has been replaced and prior to <br />germination of either permanent vegetation or temporary cereal grain <br />mulch. Careful examination of the discussion in Sections 816.114 and <br />780.18 reveal that Kerr Coal has given considerable attention to this <br />matter. <br />In order to understand the potential hazard of wind erosion on <br />respread topsoil one must understand the parameters used to evaluate <br />the wind erosion index. The formula used to determine the amount of <br />soil erosion caused by wind is given by Clyde, et. al. 1978 as: <br />E1 = I1 - C1 - K1 - ~1 --~1 - --- -- -- <br />• in which <br />E1 = soil loss by wind in tons/acre/year <br />I1 = soil wind erodibility factor <br />C1 = local wind erosion climatic factor <br />K1 = soil surface roughness factor <br />V1 = vegetative factor <br />L1 = length of the unshielded distance parallel to wind <br />in the direct of the wind fetch. <br />Careful examination of these factors reveals that of the five factors <br />affecting wind erosion two are set by climatic and edaphic factors <br />and are beyond the control of Kerr Coal. Management practices over <br />which Kerr Coal will have an affect are the soil roughness factor, <br />vegetative factor and slope length. <br />Fortunately decades of research are available from agricultural <br />activities in the Great Plains to document the exact influence each <br />780-73bbbR <br />Revised - August, 1990 <br />-~ <br />