Unit Hydrograph

• The hydrograph that results from 1-inch of excess precipitation (or runoff) spread uniformly in space and time over a watershed for a given duration.

• The key points :

  • 1-inch of EXCESS precipitation
  • Spread uniformly over space - evenly over the watershed
  • Uniformly in time - the excess rate is constant over the time interval
  • There is a given duration

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