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<br />e <br /> <br />Notation <br /> <br />v = Velocity <br />g = Acceleration due to Gravity <br />A = Cross-Sectional Area <br />P = Wetted Perimeter <br />R = Hydraulic Radius <br />S = Slope <br />s = Shear Strength <br />c = Cohesion of the Material <br />a = Nannal Stress <br />'" = Angle of Repose <br />a' = Effective Stress <br />u = Pore Waler Pressure <br />Cu = Undrained Strength <br />c' = Effective Cohesion <br />fit <br />Colorado Erosion Control Manual Xl <br />