For any channel section, the specific energy increases with

i) increase in depth of sub critical flow

ii) increase in depth of super critical flow

iii) decrease in depth of sub critical flow

iv) decrease in depth of super critical flow

The correct answer is -

- 1
  
  (i) and (ii)
- 2
  
  (i) and (iv)
- 3
  
  (ii) and (iii)
- 4
  
  (iii) and (iv)

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