1) The measure of the time between the center of mass of precipitation to the center of mass of runoff (on the hydrograph); basin lag is a function of not only basin characteristics, but also of storm intensity and movement. Some hydrologic texts define lag from the center of mass of rainfall to the hydrograph peak.
2) The time it takes a flood wave to move downstream.
NOAA National Weather Service - Cite This Source - This Definition
- ADVIS, API Method, Base Width, Basin Lag, Calibration, Composite Hydrograph, Distribution (Hydro)Graph, Hydrograph Separation, Hydrographic Survey, Trace, Unit hydrograph
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