2008-05-13_REVISION - C1981008 (5)

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r~ Summary of "C" Factors Pre-Mine Dryland Pasture 0.006 Post-Mine Dryland Pasture 0.059 Pre-Mine Irrigated Pasture 0.0258 Post-Mine Irrigated Pasture 0.0251 ~ "C" Factors for Permenant-Pasture and Rangeland (EPA, 1977) Vegetative Canopy Cover That Contacts the Surface 1/. Type and Height Canopy Ptx+cent Gmuttd Cover of Raised Canopy 2/ Cover 3/ .Type 4/ 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 .1'S .090 .043 ' .011 Canopy of tall forts 25 G 1.0 .36 ..17 .09 ..038 .012 .003 ~ ~~ ~~ W L0 .36 ~ .20 .13 .082 .041 .011 (O.S m fail ht) SO G 1.0 .26 .13 .07 .035. .012 ..003 • W 1.0 .26 .16 . .11 .075 .039 .011 75 G 1.0 .17 :IO .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 .4U .22 .14 .085 .042 .011 (2 m fall ht.) SU G 1.0 .34 .16 .085 ' .038 .012. .003 . W 1.0 .34 .19 .13 ~ .081 .041 .011 75 G 1.0 .28 .14 .08 .036 .012 .003 W 1.0 .28 :17 .12 .077 .040 ;OI1 Tress but no appreciable 25 G 1.0 .42 .19 .~ .10 .041 .A13 .003 low. blush W 1.0 .42 .23 .F .14 .087 .042 .011 ~(4 m fall ht.) SO G. 1.0 .39 .18 :09 .040 .013 :003 W 1.0 .39 .21. .14 .085 .042 .Oll 75 G 1.0 :36 .17 .09 .039 .012 -..003 . 1/ All values shown assume: (y random distribution of mulch or vegetation, and (2) mulch of appreciable depth where it sxists. 2/ 'Average fall height of wateidrops from campy to soil surface: m=meters. 3/ Portion of total-area surface that would be hidden from view by canopy in a vsrtical projection, (a bird's~ye view). 4/ G: Cover aY surfacx is grass. grasslike plants,.decaying compatxed duff, or litter: W: Cover at surface is mostly broadleaf herbaceous plants (as weeds with liffielateral-toot network near the surface, and/or !undecayed residue.) Table 3 - "C" Factors for Universal Soil Loss Equation 22