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<br />002545 <br /> <br />demonstrated the relationship between the magnitude of the tempera- <br />ture gradi ent and the type and extent of subsequent metamorphism. <br />These results have been used extensively by the Forest Service and <br />others in predicting avalanche occurrence. <br /> <br />CONTRACTOR: Soil Conservation Service, Oenver, Colorado <br />CONTRACT NO. 14-06-0-7183 <br />PRINCIPAL INVESTIGATOR: Jack N. Washichek <br />PERIOD: July 1, 1974, to June 30, 1976 <br />FUNDING: FY75 - $20,000 . <br /> <br />In support of CRBPP, the SCS in Colorado performed snow course <br />readings and snow pillow data collection to evaluate additional <br />snowfall attributed to the cloud seeding experiment. The SCS data <br />supplemented data collected by project instrumentation and were used <br />in snowpack monitoring to determine if seeding should be suspended. <br /> <br />The data were published in the regular snow survey bulletins of the <br />SCS. <br /> <br />.- <br /> <br />~ <br />~ <br /> <br />I <br /> <br />CONTRACTOR: Aerometric Research, Inc., Goleta, California <br />CONTRACT NO. 14-06-0-7332 <br />PRINCIPAL INVESTIGATOR: Robert O. Elliott <br />PERIOD: July I, 1974, to August 31, 1976 <br />FUNDING: FY75 - $ 63,582 <br />FY76 - $200,326 <br /> <br />The objectives of this contract were to evaluate: (1) the physical <br />concepts of weather modification potential, and (2) the practical <br />weather modification potential for an operations program on the basis <br />of information obtained in the CRBPP during five winter seasons from <br />1970 to 1975. The analysis required a detailed diagnostic post hoc <br />evaluation of seeded and nonseeded precipitation patterns during <br />shorter time intervals than the experimental day actually used during <br />seeding trials. It used 3- and 6-hour precipitation time blocks. <br /> <br />, <br /> <br />The initial analysis of the CRBPP seeding program resulted in a <br />null-effect conclusion with no significant difference in precipita- <br />tion between seeded and nonseeded experimental days. The null effect <br />was due to the mixing of possible and negative effects. Negative <br />effects resulted when seeding occurred during "out-of-bounds" condi- <br />tions, and positive effects were produced when seeding occurred <br />during proper conditions. Based on its reanalysis, Aerometric <br />concluded that there is an overall potential for precipitation <br />enhancement in the CRBPP area of about 10 percent, taking into <br />account randomization bias. This translates into an overall stream- <br />flow enhancement potential of about 19 percent. <br /> <br />11-10 <br />