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<br />,..'"~~~ c <br /> <br />." MS-230 (2-72) <br />Bureau of Reclamation <br />1. REPORT NO, <br /> <br />TECHNICAL RE' 1T STANDARD TITLE PAGE <br /> <br />,.<. GOVERNMENT ACCESSION NO. .... <br /> <br />:.. .-lECIPIENT'S CATALOG NO. <br /> <br />". . <br /> <br />4. TITLE AND SUBTITLE <br /> <br />5. REPORT DATE <br />July 1976 <br /> <br />6, PERFORMING ORGANIZATION CODE <br /> <br />Weather Modification Design Study for <br />Streamflow Augmentation in the Northern <br />Sierra Nevada <br /> <br />. <br /> <br />7, AUTHOR(S) <br /> <br />8, PERFORMING ORGA NI~A TION <br />REPORT NO. <br /> <br />C.C.Lovell, A, K. Goroch, K. W. Chu <br /> <br />MB-R-76/75 <br /> <br />9, PERFORMING ORGANIZATION NAME AND ADDRESS <br /> <br />10, WORK UNIT NO, <br /> <br />k:- <br /> <br /><_,\"ii <br /> <br />MBAs sociates <br />Bollinger Canyon Road <br />San Ramon, California 94583 <br /> <br />11. CONTRACT OR GRANT NO. <br /> <br />-, <br /> <br />12, SPONSORING AGENCY NAME AND ADDRESS <br />United States Department of the Interior <br />Bureau of Reclamation <br />Engineering and Research Center <br />Denver, Colorado 80225 <br /> <br />13. TYPE OF REPORT AND PERIOD <br />COVERED <br />Final Report <br />Ma y 1975 - J ul y 1 9 7 6 <br /> <br />14. SPONSORING AGENCY CODE <br /> <br />IS, SUPPLEMENTARY NOTES <br /> <br />16, ABSTRACT <br /> <br />This report presents the results of a design study for a <br />pilot program to augment snowpack in the Sierra Nevada Mountains. <br />The background for the program includes a review of the synoptic and <br />mesoscale climatology and the cloud physics of winter storms in the <br />area. The climatology and cloud physics relationships to precipitation <br />occurrence, rate, and duration within the river basins under consider- I <br />ation is established. A hydrology model was used to estimate the run-off <br />enhancement potential as a function of the type of precipitation and target <br />areas. The result of these simulations is followed by a review of the <br />state of cloud model development and of possible uses of models in a <br />pilot program. Finally, the seeding potential of Sierra Nevada storms is <br />explored. <br /> <br />This background information is synthesized to form a physical model of <br />precipitation mechanisms in the Sierra Nevada. The model establishes <br />a set of hypotheses which, in turn, form the basis of the experimental <br />design for the pilot program. The op erational requirements are' <br />presented in a third volume. <br /> <br />~~ <br /> <br />17. KEY WORDS AND DOCUMENT ANALYSIS <br />a. DESCRIPTORS-- <br /> <br />Winter storms, snowfall, snowpack, mesoscale climatology, precipitation <br />enhancement, cloud seeding, hydrology, weather modification, <br />experimental design. <br /> <br />'~ <br /> <br />!_> <br /> <br />-.\~ <br /> <br />b. IDENTlF IERS-- <br /> <br />c. COSATI Field/Group <br /> <br />18. DISTRIBUTION STATEMENT <br />Available from the National Technical Information Service, Operations <br />Division, Springfield, Virginia 22151. <br /> <br />19. SECURITY CLASS 21. NO. OF PAGES <br />(THIS REPORT) <br />UNCLASSIFIED <br />20. SECURITY CLASS 22, PRICE <br />(THIS PAGE) <br />UNCLASSIFIED <br /> <br />\ ' <br />