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<br />~---- <br /> <br />7-2090 (4-81) <br />Bureau of Reclamation <br />1, REPORT NO, <br />R-93-19 <br /> <br />4. TITLE AND SUBTITLE <br /> <br />TECHNICAL REPORT STANDARD TITLE PAGE <br /> <br />; ....... .....J1:.. c.. .... : ":. :- . ,.. <br /> <br />3, RECIPIENT'S CATALOG NO, <br /> <br />Cloud Seeding Feasibility for the <br />Shasta-Trinity Watershed <br /> <br />5, REPORT DATE <br />December 1993 <br />6, PERFORMING ORGANIZATION CODE <br /> <br />D-3720 <br /> <br />7, AUTHOR(S) <br />David W. Reynolds and Jack T. McPartland <br /> <br />8, PERFORMING ORGANIZATION <br />REPORT NO. <br />R-93-19 <br /> <br />9. PERFORMING ORGANIZATION NAME AND ADDRESS <br /> <br />10, WORK UNIT NO. <br /> <br />Bureau of Reclamation <br />Denver Office <br />Denver CO 80225 <br /> <br />11. CONTRACT OR GRANT NO, <br /> <br />13, TYPE OF REPORT AND PERIOD COVERED <br /> <br />12, SPONSORING AGENCY NAME AND ADDRESS <br /> <br />Same <br /> <br />14, SPONSORING AGENCY CODE <br />DIBR <br /> <br />15. SUPPLEMENTARY NOTES <br /> <br />Microfiche and hard copy available at the Denver Office, Denver, Colorado <br /> <br />16. ABSTRACT <br />Reclamation (Bureau of Reclamation) conducted this feasibility study to examine the <br />meteorological feasibility and potential cost effectiveness of increasing runoff into reservoirs in <br />the Shasta and Trinity Watersheds through application of winter orographic cloud seeding <br />technology. Based on the data presented from past seeding experiments and results of the <br />climatological studies, precipitation increases potentially achievable through seeding range <br />from 64,000 to 113,000 acre-ft for low and high precipitation years respectively. The total <br />benefit of additional water was estimated at $100/acre-ft. Benefit-cost ratios range from 5.9:1 <br />to 10.4:1 for low and high precipitation years respectively. Uncertainties exist in both the <br />estimates of additional water production possible and the costs to conduct the program. <br />However, the benefit-cost ratios are sufficiently high so that the program would be justifiable. <br /> <br />17. KEY WORDS AND DOCUMENT ANALYSIS <br />B. DESCRIPTORS-- atmospheric research! meteorology/ weather modification! orographic <br />clouds! cloud seeding! meteorological instruments! <br /> <br />b. IDENTIFIERS- Shasta-Trinity Watershed! Sierra Cooperative Pilot ProjectJ American River <br />Basin! Feather River Basin! . <br />c. COSATI Field/Group 04B COWRR: 0402.1 SRIM: <br />18. DISTRIBUTION STATEMENT 19, SECURITY CLASS 21. NO. OF PAGES <br />Available from the National Technical Information Service, Operations Division, (THIS REPORT) 83 <br />5285 Port Royal Road, Springfield, Virginia 22161 UNCLASSIFIED <br />20, SECURITY CLASS 22. PRICE <br />(THIS PAGE) <br />UNCLASSIFIED <br />