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Section 780.18 (b) Continued. Rule 4.15 <br />Revised 12/3/80 <br />~~ <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 stubble <br />mulch germination. Careful examination of the discussion in Sec- <br />tions 816.114 and 780.18 reveal that Kerr Coal has given consider- <br />able attention to this matter. <br />In order to understand the potential hazard of wind erosion on <br />respread topsoil one must understand the parameters used to evalu- <br />ate the wind erosion index. The formula used to determine the <br />amount of soil erosion caused by wind is given by Clyde, et, al. <br />1978 as: <br />El I1 - Cl - K1 - Vl - Ll <br />in which <br />• <br />El _ soil loss by wind in tons/acre/year <br />I1 = soil wind erodibility factor <br />C1 = local wind erosion climatic factor <br />Ki = soil surface roughness factor <br />Vl vegetative factor <br />Ll = length of the unshielded distance parallel to <br /> wind in the direction of the wind fetch. <br />Careful examination of these factors reveals that of the five <br />factors affecting wind erosion two are set by climatic and edaphic <br />factors and are beyond the control of Kerr Coal. Management prac- <br />tices over which Kerr Coal will have an affect are the soil rough- <br />ness factor, 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 />780-73 bbb <br />