This paper deals exclusively with the water distribution or uniformity of application aspects of sprinkler irrigation system design. As a first step in optimizing system design, the anticipated field performance of each sprinkler-pressure-nozzle-discharge selection must be predicted. A number of researchers, including Bilanski and Kidder (1958), Chu and Allred (1968), Seginer (1963), and Umback and Lembke (1966), have dealt with this problem from a theoretical basis. While a knowledge of the aerodynamic aspects of sprinkler jets may be helpful in the mechanical design of sprinklers and for a better understanding of the general interactions between wind speed, trajectory angle, pressure, and nozzle size, it has not been successfully applied to predicting sprinkler uniformity under field conditions.