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<br />" = Effective Angle of Repose <br />F, = Factor of Safety <br /> <br /> <br />H = Slope Height <br /> <br /> <br />~ = Angle of Potential Failure Plane <br /> <br /> <br />L = Lengtl1l Measured the Failure Surface <br /> <br /> <br />W = Weight <br /> <br /> <br />D, = Equivalent Volume Spherical Stone Diameter <br /> <br /> <br />Ys = Saturated Surface Dry (SSD) Specific Weight of Stone <br /> <br /> <br />a = Angle olf the Side Slope with the Horizontal <br /> <br /> <br />Ilt, = Equilibrium Scour Depth from Mean Bed Level <br /> <br /> <br />Do = Approaching Depth <br /> <br /> <br />Fo = Froude Number <br /> <br /> <br />a = Embanllanent Length Normal to Wall of Flume <br /> <br /> <br />d = ConstaJ~t of 1.1 for Scour Development <br /> <br /> <br />b = Width of Pier Normal to Flow <br /> <br /> <br />Uo = Upstream Velocity <br /> <br />XII <br /> <br />Colorado Erosion Control Manual <br />