Question

A channel designed by Lacey's theory has a velocity of 0.88 m/sec. The silt factor is 1.1. then hydraulic mean depth will be

• A. 1.95 m
• B. 1.76 m
• C. 1.63 m
• D. 1.50 m

Answer 1

The correct option is B 1.76 m

Hydraulic mean depth,

$R=\frac{5}{2}\frac{V^2}{f}=\frac{5}{2}\times \frac{(0.88{)}^2}{1.1}=1.76m$