Question:
For medium silt whose average grain size is \(0.16\) mm, Lacey's silt factor is likely to be
For medium silt whose average grain size is \(0.16\) mm, Lacey's silt factor is likely to be
Show Hint
Remember Lacey's formula:
\[
\boxed{
f=1.76\sqrt{d}
}
\]
where \(d\) is expressed in millimetres.
Updated On: Jul 23, 2026
- \(0.30\)
- \(0.45\)
- \(0.70\)
- \(1.32\)
Show Solution
Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Concept:
Lacey's silt factor is used in the design of stable alluvial channels.
It is given by
\[
\boxed{
f=1.76\sqrt{d}
}
\]
where
\[
d=\text{Mean particle size (mm)}.
\]
Step 1: Write the given data. \[ d=0.16\text{ mm} \]
Step 2: Calculate the silt factor. \[ f = 1.76\sqrt{0.16} \] \[ = 1.76\times0.4 = 0.704 \] \[ \boxed{f\approx0.70} \] Therefore, the correct option is \[ \boxed{(C)\;0.70.} \]
Step 1: Write the given data. \[ d=0.16\text{ mm} \]
Step 2: Calculate the silt factor. \[ f = 1.76\sqrt{0.16} \] \[ = 1.76\times0.4 = 0.704 \] \[ \boxed{f\approx0.70} \] Therefore, the correct option is \[ \boxed{(C)\;0.70.} \]
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