Canal Design and Silt Theories

According to Lacey's regime theory for alluvial channels, the silt factor $f$ is related to mean particle diameter $d_{mm}$ (in mm) as:

Options:

• (A) $f = 1.76 \sqrt{d_{mm}}$
• (B) $f = 0.55 d_{mm}^{0.64}$
• (C) $f = 2.5 \sqrt{d_{mm}}$
• (D) $f = 1.76 d_{mm}^2$