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Q: Basin lag in hydrology is the time difference between the _________.
  • A. rainfall and runoff of two basins
  • B. centroid of rainfall excess and centroid of surface runoff
  • C. excess rainfall and surface runoff
  • D. precipitation and evaporation
Correct Answer: Option B - Basin lag– It is the time difference between the centroids of rainfall excess and centroid of its corresponding surface runoff produced in the basin. • It is equal to the first moment of the instantaneous unit hydrograph of the basin.
B. Basin lag– It is the time difference between the centroids of rainfall excess and centroid of its corresponding surface runoff produced in the basin. • It is equal to the first moment of the instantaneous unit hydrograph of the basin.

Explanations:

Basin lag– It is the time difference between the centroids of rainfall excess and centroid of its corresponding surface runoff produced in the basin. • It is equal to the first moment of the instantaneous unit hydrograph of the basin.