Question

Flow at critical depth takes place in an open channel when

• A. for a given discharge, specific energy is minimum
• B. discharge is minimum for a given specific force
• C. for a given specific energy, discharge is maximum
• D. discharge is maximum for a given specific force

Answer 1

The correct option is A for a given discharge, specific energy is minimum

At minimum specific energy there is only one depth of flow known as critical depth whereas if specific energy is other than minimum energy, there will be two depth of flow which are known as conjugate depths.