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.
- Browse Related Terms: 100-year Flood, 100-year Flood Plain, Base Flood, Channel Routing, DNSTRM, Flood Frequency Curve, Flood Plain, Flood routing, Floodway, Lag, Lakeshore Flood Advisory, Lakeshore Flood Watch, Lakeshore Flooding, routing, Travel Time
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