On the basis of integral forms of momentum, tracer, and kinetic energy equations for the mean flow, a superposition model is developed, which is able to predict end effects of multiple jet or multiple plume discharges. The general cases of inclined, single, or multiple buoyant jets in a row normal to a uniform ambient current or wind, and of equal or lower density than the ambient fluid, are being examined and the conditions under which the model can be applied are pointed out. The pertinent quantities describing the complicated field of interacting multiple plumes/jets are detected by comparing the integral equations produced for multiple discharges with the corresponding equations for single discharges. Provided that the single buoyant jet behavior is known, the model has been applied in problems of buoyant jet interaction, yielding analytical solutions, and it has been verified using literature data. The behavior of the limiting cases is also discussed, along with the pertinent explanations. Findings can be used in the design of disposal systems, that is, stacks, multiple cell cooling tower discharges, and multiport diffusers. ¿ American Geophysical Union 1996