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demonstrated the relationship between the magnitude of the tempera- ture gradient and the type and extent of subsequent metamorphism. These results have been used extensively by the Forest Service and others in predicting avalanche occurrence. CONTRACTOR: Soil Conservation Service, Denver, Colorado CONTRACT NO. 14-06-0-7183 PRINCIPAL INVESTIGATOR: Jack N. Washichek PERIOD: July 1,1974, to June 30,1976 FUNDING: FY75 - $20,000 In support of CRBPP, the SCS in Colorado perform~d snow course readings and snow pillow data collection to evaluate additional snowfall attributed to the cloud seeding experiment. The SCS data supplemented data collected by project instrumentation and were used in snowpack monitoring to determine if seeding should be suspended. The data were published in the regular snow survey bulletins of the SCS. CONTRACTOR: Aerometric Research, Inc., Goleta, California CONTRACT NO. 14-06-0-7332 PRINCIPAL INVESTIGATOR: Robert D. Elliott PERIOD: July 1, 1974, to August 31, 1976 FUNDING: FY75 - $ 63,582 FY76 - $200,326 The objectives of this contract were to evaluate: (1) the physical concepts of weather modification potential, and (2) the practical weather modification potential for an operations program on the basis of information obtained in the CRBPP during five winter seasons from 1970 to 1975. The analysis required a detailed diagnostic post hoc evaluation of seeded and nonseeded precipitation patterns during shorter time intervals than the experimental day actually used during seeding trials. It used 3- and 6-hour precipitation time blocks. The initial analysis of the CRBPP seeding program resulted in a null-effect conclusion with no significant difference in precipita- tion between seeded and nonseeded experimental days. The null effect was due to the mixing of possible and negative effects. Negative effects resulted when seeding occurred during "out-of-bounds" condi- tions, and positive effects were produced when seeding occurred during proper conditions. Based on its reanalysis, Aerometric concluded that there is an overall potential for precipitation enhancement in the CRBPP area of about 10 percent, taking into account randomization bias. This translates into an overall stream- flow enhancement potential of about 19 percent. 11-10