The Briggs plume rise equations II

Briggs divided air pollution plumes into these four general categories:
Cold jet plumes in calm ambient air conditions
Cold jet plumes in windy ambient air conditions
Hot, buoyant plumes in calm ambient air conditions
Hot, buoyant plumes in windy ambient air conditions
Briggs considered the trajectory of cold jet plumes to be dominated by their initial velocity momentum, and the trajectory of hot, buoyant plumes to be dominated by their buoyant momentum to the extent that their initial velocity momentum was relatively unimportant. Although Briggs proposed plume rise equations for each of the above plume categories, it is important to emphasize that "the Briggs equations" which become widely used are those that he proposed for bent-over, hot buoyant plumes.