Lag

Refers to slow game response times. The cause can be graphical based (weak graphics card), internet based (ping), system based (lack of memory, virtual memory), server based (overloaded server) or usually some combination of each.

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.