Question

Best side slope for the most economical trapezoidal section in open channel flow, where inside slopes are defined by: X horizontal to 1 vertical, is when X equals

• A. 0.500
• B. 0.577
• C. 0.673
• D. 0.404

Answer 1

The correct option is B 0.577

A most economical trapezoidal channel is half-hexagon such that its internal angle is ${120}^{\circ }$


$\tan {30}^{\circ }=\frac{x}{1}or\frac{1}{\sqrt{3}}=\frac{x}{1}orx=0.577$