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<math>V_{R}=0.255\left ( 1+0.83^{C_{U}} \right )</math>
<math>V_{R}=0.255\left ( 1+0.83^{C_{U}} \right )</math>
Where coefficient of uniformity is the ratio of the 60th and 10th percentile grain sizes:
Where coefficient of uniformity is the ratio of the 60th and 10th percentile grain sizes:
<math>C_U=\frac{d_60}{d_10}</math>
<math>C_U=\frac{d_{60}}{d_{10}}</math>