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• Undisturbed Area - Assume canopy of short brush, 50X canopy cover, <br />20x ground cover (weeds) <br />CP = 0.16 <br />Rainfall Factor, R. An average annual R value and an average storm R <br />value is needed to compute long-term erosion, in order to calculate the <br />3-year sediment yield. Values were calculated using procedures set <br />forth in Barfield, et. al., (1981) as follows: <br />Rannual 21P2'2 for a Type II storm <br />2,6 <br />Where: P2~6 = 2-year, 6-hour precipitation in inches <br />= 0.8 inches <br />• Rannual = 21(0.8)2'2 = 16.5 <br />Rstorm = D=~~2.2 <br />Mhere P is the 10-year, 24-hour precipitation in inches and D <br />is the storm duration in hours <br />Rstorm = 19.25.1.7 2'2 = 14.0 <br />(24) <br />Sediment Sceclflc Weight. SW. The specific gravity of the sediment was <br />assumed to be 2.50 (SEOCAD+ default value). Therefore. the sediment <br />weight is equal to 155.78 lb/ft~. <br />• <br />23-71 <br />