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

Table 3 - "C" Factors for Universal Soil Loss Equation
"C„ Factors for Permenant-Pasture and Rangeland
(EPA, 1977)

Vegetative Canopy Cover That Contacts the Surface 1/.
Type and Height Canopy Percent Ground Cover
e 4/
v
r 3/ T
n
2/ C
f R
i
d C - -
o
e
yp
o
a
se
a
opy
0 10 20 40 60 80 95-100
No appreciable canopy G 1.0 .45 .20 .10 ..042 .013 .003
W 1.0 .45 .24 .15 .090. .043 .011
Canopy of tall forbs .25 G 1.0 .36 . .17 .09 ..038 .012 .003
or short brush W 1.0 .36 .20 .13 .082 .041 .011
.(0.5 m fall ht) 50 G 1.0 .26 .13 .07 .035. .012 .003
W 1.0 .26 .16 . .11 .075 .039 .011
75 G 1.0 .17 ...10 .06 .031 .011 .003
W 1.0 -.17 .12 .07 .067 .038 .011
Appreciable brush 25, G 1.0 .40 .18 `.09 .040 .013 .003
or brushes W 1.0 .40 .22 .14 .085 .042 .011
(2 m fall ht.) 50 G 1.0 .34 .16 .085 "'.038 .012. .003
W 1.0 .34 .19 .13 .081 .041 Oil
75 G 1.0 .28 .14 .08 .036 .012 .003
W .1.0 .28 .17 .12 .077 .040 .011
Trees but no appreciable 25 G 1.6 .42 .19 .10 .041 ..013 .003
low brush. W 1.0 .42 .23 .4 .14 .087 .042 .011
-,(4 m fall ht.) .50 G. 1.0 39 .18 .09 .040 .013 .003
W 1.0 .39 .21. .14 .085 .042 .011
75 G 1.0 .36 .17 .09 .039 .012 .003 .
1/ All values shown assume: (i) random distribution of mulch or vegetation, and (2) mulch of appreciable depth where it exists.
2/.Average fall height of waterdrops from canopy to soil.surface: m=meters.
3/ Portion of total-area surface that would be hidden from view by canopy in a vertical. projection, (a bird's-eye view).
4/ G: Cover at, surface is grass, grasslike plants, decaying compacted duff, or litter.
W: Cover at surface is mostly broadleaf herbaceous plants (as weeds with little lateral-root network near the surface , and/or
Tundecayed residue.)
SL-12 CURRENT 11MARll.wpd 25