Laserfiche WebLink
"C" Factors for Permenant and Rangeland <br />(EPA, 1977) <br />Vegetative canopy <br />Cover That Contacts the Surface i/ <br />Type and Height Canopy <br />Percent Ground. Cover <br />of Raised Canopy 2/ Cover 3/ Type 4/ <br />0 <br />10 <br />20 <br />40 <br />60 <br />• 80 <br />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 forts 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 m fall ht.) 50 G <br />1.0 <br />.34 <br />.16 <br />.085 <br />.038 <br />.012 <br />.003 <br />W <br />lA <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 />Toes but no appreciable 25 G <br />Lb <br />.42 <br />.19 <br />. .10 <br />041 <br />.013 <br />.003 <br />low brush W <br />1.0 <br />.42 <br />.23 <br />, <br />.14 <br />.087 <br />.042 <br />.011 <br />-,(4 to fall ht.) 50 G <br />1.0 <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 />If All values shown assume: (1) random distribution of mulch or vegetation, and (2) mulch of appreciable depth <br />where it odsts. <br />2/ - Average fall height of waterdrops from canopy to soil surface: m =meters. <br />3/ Portion of total -area surface that would be hidden from view by canopy in a vertical -pro (a bird's <br />-eye view). <br />4/ G: Cover ar surface is 'grass grasslike plants, decaying compacted duff, or <br />litter. <br />W: Cover at surface is mostly broadleaf herbaceous plants (as weeds with little lateral -root network new the surface, <br />and/or <br />wrdecayed residue.) <br />REVISED MAY 2010 Attachment 2.05.3(3) -20 -9 <br />