The ordinate of the Instantaneous Unit Hydrograph (IUH) of a catchment at any time t, is

- 1
  
  the slope of the 1-hour unit hydrograph at that time
- 2
  
  the slope of the direct runoff unit hydrograph at that time
- 3
  
  difference in the slope of the S-curve and 1-hour unit hydrograph
- 4
  
  the slope of the S-curve with effective rainfall intensity of 1cm/hr

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