Soil Report - Agriculture et Agroalimentaire Canada

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PROCEDURE : With appropriate data, enter scale at left and proceed to
points representing the soil's % sand (0 .10-2.0 mm), % organic matter,
structure, and permeability, in that sequence . Interpolate between plotted
curves . The dotted line illustrates procedures for a soil having : si+vfs 65%,
sand 5%, OM 2.8%, structure 2, permeability 4 . Solution: K=0.31 .
ô
.30 â
. . . . . . . . . . to . . . .
~ ,20 `- .70
.10 .60
Figure 45 . Nomograph for the computation of soil erodibility (K) on the basis of soil properties
Table 25. LS-values for different combinations of slope length and slope gradient
Slope
Gradient
Percent
_
10 15 20 25 30 40
.50
.40
.30
.20
.10
Slope Length (m)
50
60
1 - very fine granular
2 - fine granular
3 - med . or coarse granular
4 - blocky, platy, or massive
F
I
IMAIN I
PRIME00,006
PF r
OVA FMAAA
6 - very slow
5 - slow
4 - slow to mod.
3 - moderate
2 - mod . to rapid
1 - rapid
75 100 125 150 200 250 300
0 .2 .063 .069 .073 .076 .080 .084 .088 .091 .095 .101 .105 .109 .116 .121 .125
0 .5 .076 .083 .088 .092 .095 .101 .105 .109 .114 .121 .126 .131 .139 .145 .151
0 .8 .090 .098 .104 .108 .112 .119 .124 .129 .135 .143 .149 .155 .164 .172 .178
2 .144 .162 .177 .189 .200 .218 .233 .246 .263 .287 .307 .324 .353 .377 .399
3 .205 .232 .253 .270 .285 .311 .333 .351 .376 .410 .438 .463 .504 .539 .570
4 .256 .301 .338 .369 .397 .446 .487 .524 .573 .643 .703 .756 .849 .928 .998
5 .306 .375 .433 .485 .531 .613 .685 .751 .839 .969 1.08 1.19 1.37 1 .53 1.68
6 .385 .472 .545 .609 .667 .770 .861 .943 1.05 1.22 1.36 1.49 1.72 1 .93 2 .11
8 .568 .695 .803 .898 .983 1 .14 1.27 1.39 1 .56 1.80 2 .01 2.20 2.54 2.84 3 .11
10 .784 .960 1 .11 1 .24 1 .36 1 .57 1 .75 1 .92 2 .15 2.48 2.77 3.04 3 .51 3.92 4.29
12 1.03 1.27 1.46 1 .63 1 .79 2.07 2 .31 2 .53 2 .83 3 .27 3.65 4.00 4.62 5.17 5.66
14 1.13 1 .61 1.86 2.08 2.28 2.63 2 .94 3 .22 3 .60 4.16 4.65 5.09 5.88 6.57 7.20
16 1.63 1.99 2.30 2.57 2.82 3 .25 3 .63 3 .98 4 .45 5 .14 5 .75 6 .30 7.27 8.13 8.90
18 1.97 2 .41 2.78 3 .11 3 .41 3.93 4.40 4 .82 5 .39 6 .22 6 .95 7 .62 8.80 9.83 10.8
20 2.34 2.86 3.30 3.69 4 .05 4.67 5 .22 5 .72 6 .40 7.39 8.26 9.05 10.4 11 .7 12 .8