A 3-hour unit hydrograph (UH) differs from a 6-hour UH, for any catchment, in that

- 1
  
  both the time of rise and rhe peak ordinate for the former are less than that for the latter
- 2
  
  both the time of rise and rhe peak ordinate for the former are greater than that of the latter
- 3
  
  the time of rise is less but the peak ordinate is greater for the former as compared to that of the latter
- 4
  
  the time of rise is greater but the peak ordinate is less for the former as compared to that of the latter

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