Question

For a hydraulically efficient rectangular channel of bed width 4.0 m, the depth of flow is

• A. 2 m
• B. 4 m
• C. 0.5 m
• D. 1 m

Answer 1

The correct option is A 2 m

For a most economical rectangular channel
$y=\frac{b}{2}=\frac{4}{2}=2m$