The Soils of Brant County - Agriculture and Agri-Food Canada

Table 12.Guidelines for establishing soil erodibility classesClassSoil Erodibili yPotentialK-Value*Soil Characteristics1 Negligible < .152 Slight .15-.303 ModeratelySevere .30-.404 Severe .40-.50Silt and very fine sand < 25% ; >4% organic matter ; veryfine granular structure ;rapid permeability.Silt and very fine sand > 40% ; < 4% organic matter ; medium or coarse granular structure ;moderate permeability.Moderatelyhigh (< 3%) organic matter ; medium or coarse granular structure ;slow to moderate permeability.High ( > 80%) silt andvery fine sand ; low (< 2%) organic matter ; blocky, platyor massivestructure ; slow permeability.5 Very Severe > .50 Very high (>90%) silt and very fine sand ; low (< 1 076) organic matter ; block ,platy or massive structure ; very slow permeability.*Wischmeier, W.H. andD.D. Smith (20) .Table 13 .Guidelinesfor assessing soil erosion potential classesSoil erosion classSoil erosion potentialt/ha/y soil loss1 Very Slight (< 6)2 Slight (6-11)3 Moderately Severe (11-22)4 Severe (22-33)5 Very Severe (>33)Table 14 .LS-values for different combinations ofslope length and slope gradientSlopeSlope Length (m)GradientPercent 10 15 20 25 30 40 50 60 75 100 125 150 200 250 300.2 0.063 0.069 0.073 0.076 0.08 0.084 0.088 0.091 0.095 0.101 0.105 0.109 0.116 0.121 0.125.5 0.076 0.083 0.088 0.092 0.095 0.101 0.105 0.109 0.114 0.121 0.126 0.131 0.139 0.145 0 .151.8 0.09 0.098 0.104 0.108 0.112 0.119 0.124 0.129 0.135 0.143 0.149 0.155 0.164 0.172 0 .1782 0.144 0.162 0.177 0.189 0 .2 0.218 0.233 0.246 0.263 0.287 0.307 0.324 0.353 0.377 0.3993 0.205 0.232 0.253 0.27 0.285 0.311 0.333 0.351 0.376 0 .41 0.438 0.463 0.504 0.539 0.574 0.256 0 .301 0.338 0.369 0.397 0.446 0.487 0.524 0.573 0.643 0.703 0.756 0.849 0.928 0.9985 0.306 0.375 0.433 0.485 0.531 0.613 0.685 0.751 0.839 0.969 1 .08 1 .19 1 .37 1 .53 1 .686 0.385 0.472 0.545 0.609 0.667 0.77 0.861 0.943 1 .05 1 .22 1 .36 1 .49 1 .72 1 .93 2 .118 0.568 0.695 0.803 0.898 0.983 1 .14 1 .27 1 .39 1 .56 1 .8 2 .01 2 .2 2.54 2 .84 3 .1110 0.784 0.96 1 .11 1 .24 1 .36 1 .57 1 .75 1 .92 2.15 2 .48 2.77 3 .04 3 .51 3 .92 4.2912 1 .03 1 .27 1 .46 1 .63 1 .79 2.07 2 .31 2 .53 2 .83 3 .27 3.65 4 4.62 5 .17 5.6614 1 .13 1 .61 1 .86 2.08 2 .28 2 .63 2 .94 3.22 3 .6 4.16 4 .65 5 .09 5.88 6 .57 7 .216 1 .63 1 .99 2 .3 2 .57 2 .82 3 .25 3 .63 3.98 4 .45 5.14 5 .75 6 .3 7.27 8 .13 8 .918 1 .97 2.41 2.78 3 .11 3 .41 3 .93 4 .4 4.82 5 .39 6.22 6 .95 7.62 8 .8 9 .83 10 .820 2.34 2.86 3 .3 3 .69 4.05 4.67 5.22 5.72 6 .4 7.39 8 .26 9 .05 10 .4 11 .7 12 .8