Question

A rectangular channel of width 3 m discharge 2 cumecs of water. The aspect ratio of channel at critical stage is____.
(Answer correct upto two decimal places).

• A. 0.118

Answer 1

The correct option is A 0.118
Given, Q = 2 cumecs, B = 3 m

At critical stage

$Y_c={\left(\frac{q^2}{g}\right)}^{1/3}$

$={\left[\frac{(2/3{)}^2}{9.81}\right]}^{1/3}$

= 0.356 m

Aspecto ratio = $\frac{Depth}{Width}$

$=\frac{0.365}{3}=0.118$