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"C" Factors for Permenant Pasture and Rangeland <br />(EPA, 1977) <br />Vegetative Canopy Cover That Contacts the Surface I/ <br />Type and Height Canopy <br />of Raised Canopy 2/ Cover 3/ Type 4/ <br />Percent Ground Cover <br />0 10 20 40 60 80 95 -100 <br />No appreciable canopy G <br />1.0 <br />.45 <br />.20 <br />.10 <br />.042 <br />.013 <br />.003 <br />W <br />1.0 <br />.45 <br />.24 <br />.15 <br />.090 <br />.043 <br />.011 <br />Canopy of tall forbs 25 G <br />1.0 <br />.36 <br />.17 <br />.09 <br />.038 <br />.012 <br />.003 <br />or short brush W <br />1.0 <br />.36 <br />.20 <br />.13 <br />.082 <br />.041 <br />.011 <br />(0.5 m fall ht.) 50 G - <br />1.0 <br />.26 <br />.13 <br />.07 <br />.035 <br />.012 <br />.003 <br />W <br />1.0 <br />.26 <br />.16 <br />.11 <br />.075 <br />.039 <br />.011 <br />75 G <br />1.0 <br />.17 <br />.10 <br />.06 <br />.031 <br />.011 <br />.003 <br />W <br />1.0 <br />-.17 <br />.12 <br />.07 <br />.067 <br />.038 <br />.011 <br />Appreciable brush 25 G <br />1.0 <br />.40 <br />.18 <br />'.09 <br />.040 <br />.013 <br />.003 <br />or brushes W <br />1.0 <br />.40 <br />.22 <br />.14 <br />.085 <br />.042 <br />.011 <br />(2 in fall ht.) 50 G <br />1.0 <br />.34 <br />.16 <br />.085 <br />'.038 <br />.012 <br />.003 <br />- W <br />1.0 <br />.34 <br />.19 <br />.13 <br />.081 <br />.041 <br />.011 <br />75 G <br />1.0 <br />.28 <br />.14 <br />.08 <br />.036 <br />.012 <br />.003 <br />W <br />1.0 <br />.28 <br />.17 <br />.12 <br />.077 <br />.040 <br />.011 <br />Trees but no appreciable 25 G <br />1.0 <br />.42 <br />.19 <br />,.10 <br />.041 <br />..013 <br />.003 <br />low brush W <br />1.0 <br />.42 <br />.23 <br />.14 <br />.087 <br />.042 <br />.011 <br />,.,(4 to fall ht.) 50 G <br />110 <br />.39 <br />.18 <br />.09 <br />.040 <br />.013 <br />.003 <br />- W <br />1.0 <br />.39 <br />.21. <br />.14 <br />.085 <br />.042 <br />.011 <br />75 G <br />1.0 <br />.36 <br />.17 <br />.09 <br />.039 <br />.012 <br />_003 <br />1/ All values shown assume: (I) random distribution of mulch or vegetation, <br />and (2) mulch of <br />appreciabledepth <br />where it exists. <br />2/ Average fall height of waterdrops from canopy to soil surface: <br />m= meters. <br />31 Portion of total -area surface that would he hidden from view by canopy in a vertical projection, <br />(a bird's <br />-eye view). <br />4/ G: Cover at surface is grass, grasslike plants, decaying compacted duff, <br />or litter. <br />W: Cover at surface is mostly broadleaf herbaceous plants (as weeds with little lateral -root network hear the surface, <br />and/or <br />undecayed residue.) <br />Revised May 2010 (PR06) Attachment 2.05.3(3) -20 -7 <br />