A limited scope precipitation enhancement program, conducted for the Kingston Corporate Area of during the summer of 1975, appears to have been successful. Due to the high variability of natural rainfall amounts, the exact attainments of the program cannot be accurately specified. Qualitative evaluations based on percent of percent of average precipitation lend strong support to the conclusion that there was a positive effect in the target area. Semi-quantitative target and control evaluations performed by the Meteorological Service of Jamaica indicated increases in precipitation in the two target areas of approximately 26 percent. A corresponding increase in runoff of 165 million gallons was estimated to have resulted from the four month project. Attributing all direct costs of the project to this estimated increase in runoff indicates the cost of additional deliverable water to have been 37 cents per i000 gallons
Griffith et al. (Thu,) studied this question.