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<br />There has been a certain degree of mistargeting resulting from a lack of <br />understanding of transport and dispersion characteristics of nucleant plumes <br />that for all but the highest level generators often behaved differently than <br />those in the Climax experiment. This lead to some cases of self contamination <br />of unseeded control days. <br /> <br />The implications of these results with respect to the design of an oro.- <br />graphic project for testing the effectiveness of a seeding method in producing <br />increases in target area precipitation will be presented in a later paper. <br /> <br />ACKNOWLEDGMENTS <br /> <br />The U. S. Department of the Interior, Bureau of Reclamation, Division of <br />Atmospheric Water Resources Management, has provided the support and the data <br />base for the on-going basic analyses of the Colorado River Basin Pilot Projl~ct. <br />This article contains only a brief resume of the major findings to date th,at <br />are relevant to design of orographic seeding test projects. More detailed <br />information may be found in the third interim report (Elliott et. al., 1975). <br /> <br />REFERENCES <br /> <br />Cermak, J. E., L. O. Grant, and M. N. Orgell, 1969: Research development <br />techniques for estimating airflow and diffusion parameters in connection <br />with atmospheric water resources program. Report to Bureau of Reclamation, <br />Contract l4-06-D-6455. <br /> <br />Elliott, R. D., A. Court, R. W. Shaffer, and J. F. Hannaford, 1975: Colorado <br />River Basin Pilot Project Third Interim Progress Report covering an <br />appraisal of the first four years. Report No. 75-1, Aerometric Research <br />Inc., Santa Barbara, California. <br /> <br />Grant, L. 0., C. F. Chappel, L. W. ~row, P. W. Mielke Jr., J. L. Rasmussen, <br />W. E. Shobe, H. Stockwell, and R. A. Wykstra, 1969: Operational adapta- <br />tion program for the Colorado River Basin. Interim report for July 1965- <br />June 1969. Department of Atmospheric Science, Colorado State University. <br />A later edition entitled Weather Modification - A Pilot Project, was <br />issued in 1974. <br /> <br />Grant, L. O. and R. D. Elliott, 1974: The cloud seeding temperature window. <br />J. Appl. Meteor., 13, pp. 335-363. <br /> <br />20 <br />