If a 4-hour unit hydrographs are staggered and added graphically, the resulting hydrograph will be

- 1
  
  4-hour unit hydrograph
- 2
  
  4-hour hydrograph with 20 mm runoff
- 3
  
  8-hour unit hydrograph
- 4
  
  8-hour hydrograph with 20 mm runoff

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