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<br />At equilibrium for noncohesive bed materials and for fully <br />developed clear-water scour Laursen used the following <br />equation: <br /> <br />, c = 4 Dso <br /> <br />Also, <br /> <br />" = yy,Sf <br /> <br />yV;n2 <br />= <br /> <br />1 <br />Y23 <br /> <br />using Strickler's approximation for n <br /> <br />n = 0.34 Dso-;; <br /> <br />Then at incipient motion <br /> <br />'2 <br />= 1.0 <br /> <br />"< c <br /> <br />13 <br />