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When the depth of water in an open channel is greater than the critical depth then flow is said to be

When the depth of water in an open channel is greater than the critical depth then flow is said to be Correct Answer tranquil

Critical depth:

Critical depth is defined as the depth of flow where energy is at a minimum for a particular discharge.

Actual depth is greater than the critical depth, flow is subcritical or tranquil.

Actual depth is less than the critical depth, flow is supercritical.

Fr < 1, the flow is subcritical.

The characteristics of critical flow are:

(i) The specific energy and specific force are minimum for the given discharge.

(ii) The Froude number is equal to unity.

(iii) For a given specific energy the discharge is maximum at the critical flow.

(iv) The velocity head is equal to half the hydraulic depth in a channel of small slope.

(v) Flow at the critical state is unstable.

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