Which of the following are Saint Venant's equations for insteady open-channel flow?

i) continuity equation

ii) momentum equation

iii) energy equation

- 1
  
  Only (i)
- 2
  
  (i) and (ii)
- 3
  
  (i) and (iii)
- 4
  
  (i), (ii) and (iii)

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