For uniform flow in a channel -

- 1
  
  the total energy line, water surface and bottom of channel are all horizontal
- 2
  
  the total energy line and water surface are horizontal but bottom of channel is inclined
- 3
  
  the total energy line, hydraulic gradient line and bottom of channel are all parallel
- 4
  
  water surface and bottom of channel are parallel to each other but energy grade line is not parallel to them

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