Question

In a lined rectangular canal, the Froude number of incoming flow is 3.0. A hydraulic jump forms when it meets the pool of water. The depth of flow after the jump formation is 1.51 m. Froude number of flow after the hydraulic jump is

• A. 0.71
• B. 0.30
• C. None of these
• D. 0.41

Answer 1

The correct option is D 0.41

$\frac{y_2}{y_1}=\frac{1}{2}[-1+\sqrt{1+8F_1^2}]=3.77$

$\frac{y_1}{y_2}=\frac{1}{2}[-1+\sqrt{1+8F_2^2}]=\frac{1}{3.77}$

$F_2=0.41$