2008-12-11_PERMIT FILE - C1980007A ‎(36)‎

• Permit No: C1980007A
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2008
• Doc Name: Small Area Exemption Demonstrations
• Section_Exhibit Name: Exhibit 66 SAE
• Media Type: D
• Archive: Yes

Vegetative Canopy Cover that contacts the Surface
Type and Height Canopy
of Raised Canopy 2/ Cover 3/ Type 4/ Percent Ground Cover
0 20 - 40- - 60 0 -
Column No.: 2 3 4 5 6 7 8 9
No appreciable canopy G .45 .20 .10 , .042 .013 ' .003
W .45 .24 .15 .090 .043 .011
Canopy of tall forbs 25 .36 ?.17. .09 .038 OL2 .003
or short brush .-. W .36 .20 - .13 .082 .041 .011
(0.5 m fall ht.) 50 G. .26 .13 .07 .035 .012 .003
W .26 .16 .11 .075 .039 .011
75 G .17 .10 .06 .031 .011 .003
W .17 .12 .07 .067 .038 .011
Appreciable brush 25 G .40 .18 .09 .040 .013 .003
or brushes W .40 .22 .14 .085 .042 .011
(2 m fall ht.) 50 G .34 .16 .085 .038 .012 .003
W .34 .19 .13 .081 .041 .011
75 G .28 .14 .08 .036 .012 .003
W :28 .17 .12 .077 .040 .011
Trees but no appre- 25 G .42 .19 .10 .041 .0.13 .003
ciable low brush W .42 .23 .14 .087 .042 .011
(4 m fall ht.) 50 G .39 .18 .09 .040 .013 .003
W .39 .21 .14 .085 .042 .011
75 G .36 .17 .09 .039 .012 .003
W .36 .20 .13 .083 .041 .011
1 All values shown assume: (1) 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 undecayed residue.)
Table 1. "C" Factors for Permanent Pasture and Rangeland
(from USDA Agronomy Note # 50)
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