After heavy rain, water flows on a concrete surface at an average velocity of 1.3 m/s. If the water depth is 2 cm, determine whether the flow is subcritical or supercritical.

Supercritical flow.

Explanation:

The Froude number is an useful indicator to determine if flow is subcritical, critical or supercritical, whose formula for an open channel is:

Then:

Which is greater than 1 and, therefore, the flow is supercritical.

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