CMS-Flow:Incipient Motion

Komar and Miller (1975):

$U_{crc}={\begin{cases}0.19(d_{50})^{0.1}\log {_{10}{\big (}{\frac {4h}{d_{90}}}{\big )}},&{\text{for }}0.1\leq d_{50}\leq 0.5mm\\8.5(d_{50})^{0.6}\log {_{10}{\big (}{\frac {4h}{d_{90}}}{\big )}},&{\text{for }}0.5\leq d_{50}\leq 2.0mm\end{cases}}$

(11)

$U_{crw}={\begin{cases}0.24[(s-1)g]^{0.66}(d_{50})^{0.33}T_{p}^{0.33},&{\text{for }}0.1\leq d_{50}\leq 0.5mm\\0.95[(s-1)g]^{0.57}(d_{50})^{0.43}T_{p}^{0.14},&{\text{for }}0.5\leq d_{50}\leq 2.0mm\end{cases}}$

(12)