Question

Water flows at a rate of $10m^3/s$ in a rectangular channel 3 m wide. The critical depth of flow is

• A. 2 m
• B. 1.13 m
• C. 1.45 m
• D. 1.04 m

Answer 1

The correct option is D 1.04 m

$q=\frac{Q}{B}=\frac{10}{3}=3.333$

$\therefore y_c={\left[\frac{q^2}{g}\right]}^{1/3}={\left[\frac{\left({3.333}^2\right)}{9.81}\right]}^{1/3}=1.04m$