1996-02-06_REVISION - M1977493 (15)

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• TABLE 15 VALUES FOR "C" FACTOR 1 • • Vegetal Canopy Cover That Contacts the Surface _ Canopy f ht & hei T r C Percent Ground Cover I g ype ?y 4 100 95 Raised Canopy _ Type 0 20 40 60 80 - No appreciable G AS .20 .10 .042 , .013 .003 W AS .24 .15 .090 .043 .011 canopy Canopy of tall weeds or short brush (0.5 m fall ht.) 2S G .36• .17 .09- .038- .012 .003 W .36 .20 .13 .082 .041 .011 SO G .26 .13 .07 .03S .012 .003 W .26 .16: .11 .075' .039 .011 7S G .17 .10 .06 .031 .011 .003 W .17 .12 .09 .067 .038 .011 Appreciable brush or bushes (2 m fall ht.) -25 G .40 .18 .09 .040 .013 .003 . • W .40 .22 .14 .085 .042 .011 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 appreciable low brush (4 m fall ht.) 25 G .42 .19 .10 .041 .013 .003 W .42 .23 .14 .087 .042 .011 S0 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 'All values shown assume: 1) random distribution of mulch or vegetation, 2) mulch of appreciable depth where it exists, and 3) the site has not been disturbed by mechanical or other means. 23 Average fall height of waterdrops from canopy to soil surface: m = meters. Portion of total-area surface that would be hidden from view by canopy in a vertical projection (a bird's-eye view). 4G: Cover at surface is grass, grasslike plants, decaying compacted duff, or litter at least 2 inches deep. W: Cover at surface is mostly broadleaf herbaceous plants (as weeds) with little lateral-root network near the surface, and/or undecayed residue.