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' r • • I <br />Under critical conditions of incipient motion, the equation becomes <br />- 8 tc 1/2 <br />Vc=( fp) <br />For the material previously described, the Darcy-Weisbach f is <br />approximately 0.06. Solving for Vc yields <br />V~ = 5.3 ft/sec for Ds = 1" <br />Vc = 8.4 ft/sec for DS = 2.5" <br />Vc = 9.9 ft/sec for Ds = 3.5" <br /> <br />