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• <br />i• <br />5.00 <br />0.00 <br />0.1 0.45 0.67 1 <br />Shields Shear (Ib/sq.ft.) <br />• Figure 6 Riprap Size as Function of Slope and Shields Shear Stress <br />Client:CC&V Gold Mining Co. <br />Title: Storm Water Management, MLE <br />b. Shields Shear t = 62.4 x depth x channel slope (Ib/sf) <br />c. Dsa = 21 t <br />62.4 (SG-1) [cos a tan ~ - sin A] <br />where SG is Specific Gravity of Stones <br />~ is the slope of the channel in degrees <br />~ is the angle of repose in degrees = 42° <br />for angular rock of most riprap sizes. <br />d. For constant ~ of 42° the equations resolve to <br />DSO, = f(Slope, Shields Shear) (Figure 1) <br />Invert D50 as Function of Slope and Shields <br />Shear <br />30.00 <br />25.00 <br />rn <br />c <br />'c 20.00 <br />J <br />~ 15.00 <br />t <br />U <br />w <br />O <br />10.00 <br />10 <br />4/11 /08 <br />Page 19 <br />