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.
The time it takes a flood wave to move downstream. Streamline flow in which successive flow particles follow similar path lines and head loss varies with velocity to the first power. An electronic device which interfaces a river or precipitation gage with a telephone line making it possible for remote computers to call a gaging site and retrieve data. The distance in the direction of flow between two specific points along a river, stream, or channel. A nonflowing or standing body of fresh water, such as a lake or pond.