Asked Nov 19, 2019
A rectangular channel 3 m wide carries 10 m^3/s at a depth of 2 m. Is the flow subcritical or supercritical? For the same flowrate, what depth will give critical flow? [Answer in units of m].

Expert Answer

Step 1

Find the velocity of flow using continuity equation.


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Q = AV A bh 10 3x2 V 1.667 m/s

Step 2

Find the Froude number using the expression.


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V gh 1.667 9.81x2 F = 0.376 <1 R

Step 3

Find the flow subcritical or supercritical.

The Froude number is lesser than 1. Th...

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