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"C" Vactors for Permenant -Pasture and Rangeland <br />(EPA, 1977) <br />vegetative Canopy Cover That Contacts the Surface 1/ <br />Type and Height <br />Canopy <br />Pexreat Ground Cover <br />of Raised Canopy 2/ <br />Cover 3/ <br />Type 4/ <br />0 <br />10 <br />ZO <br />40 <br />60 <br />80 <br />95 -100 <br />No appreciable canopy <br />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 <br />25 <br />G <br />1.0 <br />.36 <br />.17 <br />.09 <br />.038 <br />.012 <br />.003 <br />or short brush <br />W <br />1.0 <br />.36 <br />.20 <br />.13 . <br />.082 <br />.041 <br />.011 <br />(0.5 m fall ht.) <br />50 <br />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 <br />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 <br />25 <br />G <br />1.0 <br />.40 <br />.18 <br />'.09 <br />.040 <br />.013 <br />.003 <br />or brushes <br />W <br />1.0 <br />.40 <br />.22 <br />.14 <br />.095 <br />.042 <br />.011 <br />(2 in fall ht.) <br />50 <br />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 <br />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 <br />25 <br />G <br />1.0 <br />.42 <br />.19 <br />".10 <br />.041 <br />.013 <br />.003 <br />low brush <br />W <br />1.0 <br />.42 <br />.23 <br />. .14 <br />.087 <br />.042 <br />.011 <br />,(4 in fall ht.) <br />50 <br />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 <br />G <br />1.0 <br />.36 <br />.17 <br />.09 <br />.039 <br />.012 <br />.003 <br />1/ All values shown assume: (1) random distribution of mulch or vegetation, and (2) mulch of appreciable depth where it exists. <br />2/ Average fall height of watordrops from canopy to soil surface: m =meters. <br />31 Portion of total -area surface that would be hidden from view by canopy in a vertical projection, (a bird's -eye view). <br />4/ G: Cover at surface is grass, grasslike plants, decaying compacted duff, or litter. <br />W: Cover at surface is mostly broadleaf herbaceous plants (as weeds with little lateral -root network near the surface, and/or <br />Videcayed residue.) <br />Revised May 2010 (PR06) Attachment 2.05.3(3) -22 -6 <br />