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K, = [1- (sine 8 /sin2o)10.5 <br />where: <br />6 = the bank angle with the horizontal; and <br />0 = the riprap material's angle of repose. <br />The average flow depth and velocity used in Equation 6 are main <br />channel values. The main channel is defined as the area between the <br />channel banks (see Figure 17). <br />Left Floodplain <br />T <br />Main <br />#� Channel ��. Right Floodplain } <br />Figure 17. Definition Sketch; Channel Flow Distribution <br />Equation 6 is based on a rock riprap specific gravity of 2.65, and a <br />stability factor of 1.2. Equation 8 and Ens ration 9 present correction <br />factors for other specific gravities and stability factors. <br />The following form can be used to calculate D50: <br />CSg = 2.12/(SS - 1)1-5 <br />where: <br />SS = the specific gravity of the rock riprap. <br />Csf = (SF/1.2)1.5 <br />where: <br />SF = the stability factor to be applied. <br />The correction factors computed using 'Equation 8 and ^ - , are <br />multiplied together to form a single correction factor C. This correction <br />factor, C, is then multiplied by the riprap size computed from Equation 6 <br />(7) <br />(8) <br />(9) <br />