Question

In a Lacey regime channel:
1. The bed load is zero
2. The suspended load is zero
3. The bed slope is a function of the full supply discharge and the silt size.
Which of the above statement is/ are correct?

• A. 1 and 2
• B. 3 only
• C. 2 and 3
• D. 2 only

Answer 1

The correct option is B 3 only

In Lacey's regime channel

$f=1.76\sqrt{d_{mm}}$

$S=\frac{f^{5/3}}{3340Q^{1/6}}$

f = silt factor, Q = discharge, d = silt size
Hence
The bed slope is a function of the full supply discharge and the silt size.