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<br />e <br /> <br />cf = Effe ;tive Angle of Repose <br />F, = Fact)r of Safety <br />H = Slop: Height <br />~ = Angl.: of Potential Failure Plane <br />L = Length Measured the Failure Surface <br />W = Weight <br />D. = Equ lvalent Volume Spherical Stone Diameter <br />'Y. = Sabnared Surface Dry (SSD) Specific Weight of Stone <br />9 = Angle: of the Side Slope with the Horizontll <br />0., = Equilibrium Scour DepdJ from Mean Bed Level <br />Do = APfroaching Depth <br />F 0 = Froode Number <br />a = Embankment Length Normal to Wall of Flume <br />d = Conslant of 1.1 for Scour Development <br />b = Widt/l of Pier Nonnal to Flow <br /> <br />Uo = Upslream Velocity <br />e <br /> <br />XII <br /> <br />Colorado Erosion Control Manual <br />