Question

Consider the following statement regarding most efficient trapezoidal channel and identify the INCORRECT one (s):
1. The half of top width is equal to length of side slope.

2. The side slope is inclined at an angle ${60}^o$ from vertical.

3. The hydraulic radius is half the depth of flow

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

Answer 1

The correct option is A 2 only


For most efficient trapezoidal section,

$\left(i\right)\frac{T}{2}$ = length of side slope

$\left(ii\right)R=\frac{y}{2}$

$\left(iii\right)\Theta ={60}^o$

(iv) A circle of radius equal to depth of flow should be inscribed in trapezoidal section.