Question

A hydraulically efficient trapezoidal channel section has a uniform flow depth of 2 m. The bed width (expressed in m) of the channel is

• A. 2.01 m
• B. 2.31 m
• C. 1.18 m
• D. 4.85 m

Answer 1

The correct option is B 2.31 m

For hydraulically efficient trapezoidal channel,
Lateral side = Horizontal side
From figure,


$\Rightarrow Bsin{60}^{\circ }=d$

$B=\frac{d}{sin{60}^{\circ }}=2.31m$