2011-03-17_REVISION - C1981008 ‎(2)‎

• Permit No: C1981008
• IBM Index Class Name: REVISION
• Doc Date: 3/17/2011
• Doc Name: Response to 2nd Adequacy Review
• From: Greg Lewicki and Associates, PLLC
• To: DRMS
• Type & Sequence: SL12
• Email Name: MLT
• Email Name: SB1
• Media Type: D
• Archive: No

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Values for topographicfactor. I.S. for low ratio of dU.to interrill erosion.1
Horizontal slope length (ft)
Slope <3 6 9 12 15 25 50 75 100 .150 200 250 300 400 600 800 1000
M
0.2 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05
0.6 0.08 0.08 0.08 0.08. 0:08 0.08 0.08 0.08 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09
1.0 0.12 0.12 0.12 0.12 0.12 0.13 0.13 0.14 0.14 0.15 0.15 0.15 0.15 0.16 0.16 0.17 0.17
2.0 0.20 0.20 0.20 0.20 0.20 0.21 0.23 0.25 0.26 0.27 • 0.28 0.29 0.30 0.31 0.33 0.34 0.35
3.0 0.26 0.26 0.26 0.26 0.26 0.29 0.33 0.36 0.38 0.40 0.43 0.44 0.46 0.48 0.52 0.55 0.57
4.0 0.33 0.33 0.33 0.33 0.33 0.36. 0.43 0.46 0.50 0.54 0.58 0.61 0.63 0.67 0.74 0.78. 0.82
8.0 0.38 0.38 0.38 0.38 0.38 0.44 0.52 0.57 0.62 0.68 0.73 0.78 0.81 0.87 0.97 1.04 1.10
6.0 0.44 0.44 0.44 0.44' 0.44 0.50 0.61 0.68 0.74 0.83 0.90 .0.95 1.00 1.08 _ 1.21 1.31 1.40
0
8 0
54 0.54 0.54 0.54 0.54 0.64 0.79 0.90 0.99 1.12 1.23,, 1.32 1.40 1.53 1.74 1.91 2.05
.
10.0 .
0.60 0.63 0.65 0.66 0.68 0.81 1.03 1.19 1.31 1.51 1.67 1.80 1.92 2.13 2.45 2.71 2.93
12.0 0.61 0.70 0.75 0.80 0.83 1.01 1.31 1.52 1.69 1.97 2.20 .2.39 2.56 2.85 3.32 3.70 4.02
14.0 0.63 0.76 0.85 0.92 0.98 1.20: 1.58 1.85 2.08 2.44 2.73 2.99 3.21 3.60 4.23 4.74 5.18:
16.0 0.65 0.82 0.94 1.04 1.12 1.38 1.85 2.18 2.46 2.91 3.28 3.60 3.88 4.37 5.17 5.82 6.39
20.0 0.68 '0.93 1.11 1.26 1.39 1.74. 2.37, 2.84 3.22 3.85 4.38 4.83 5.24 5.95 713 8.10 8.94
26.0 0.73 1.05 1.30 1.51 1.70 2.17., . 3.00 3.63 4.16 6.03 5.78 6.39 6.96 7.97 9.65 11.04 12.26
30.0 0.77 1.16 1.48 1.75 2:00 2.57. .3.80 .4.40 5.06 6.18 7.11 . , 7.94 8.68 9.99 12.19 14.04 15.66
40.0. 0.85 1.36 1.79 2.17 2.53 3.30 4.73 5.54 6.78 8.37 9.71 10.91 11.99 13.92 17.19. 19.98 22.41
50.0 0.91 1.52 2.06 2.54 3.00 3.95 5:74 7.14 8.33 10.37 12.11 13.65 15.08 17.59 21.88 25.55 28.82
60.0 0.97 .1.67 2.29 2.86 3.41 4.52 6.63 8.29 9.72 12.16 14.26 16.13 17.84 20.92 28.17 30.68 34.71
1Such as for rangeland and other consolidated. soil conditions with cover (applicable to thawing soil where both Intenill and rill erosion are significant).