Canal Design: Lacey, Kennedy & Tractive Force

In Lacey's regime canal theory, the silt factor $f$ for an average sediment particle diameter $d_{\text{mm}}$ (in mm) is given by:

Options:

• (A) $f = 1.76 \sqrt{d_{\text{mm}}}$
• (B) $f = 0.55 d_{\text{mm}}^{0.64}$
• (C) $f = 2.5 d_{\text{mm}}$
• (D) $f = \frac{1}{d_{\text{mm}}}$