Practice Question: Determine the Supercritical Flow Depth for a Channel

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Solution

Solution: B) 2.25 ft

Refer to the PE Civil Reference Handbook Section 6.4.7:

The equation to determine the supercritical flow depth based on subcritical velocity and depth:

\[y_1=-\frac{1}{2} y_2+\sqrt{\frac{2 * v_2^2* y_2}{g}+ \frac{y_2^2}{4}}\]\[y_1=-\frac{1}{2}(3 \ ft)+\sqrt{\frac{2 * (8 \ ft/sec)^2* 3 \ ft}{32.2 \ ft/s^2 }+ \frac{(3 \ ft)^2}{4}}\]\[y_1\approx2.25ft\]

 

 

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