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Which of the following is CORRECT statement for critical flow through open channel?

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Which of the following is CORRECT statement for critical flow through open channel?
  • AThe specific energy is minimum for a given discharge
  • BThe discharge is maximum for a given specific energy
  • CBoth of the above
  • DNone of the above
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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.