Instantaneous unit hydrograph is a hydrograph of

i) unit duration

ii) unit rainfall excess

iii) infinitely small duration

iv) infinitely small rainfall excess

The correct answer is

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

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