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<br />T ABI.E OF CONTENTS <br /> <br />Section Paee <br /> <br />Executive Summar)' J <br />I. Background 7 <br />2. Introduction to Cloud Seeding for <br />Winter Precipitation Augmentation 8 <br />3. Typic..' Seeding Agents and 1\lodcs of Seeding 10 <br />3.1 Typical Seeding Agents 10 <br />3.2 Seeding ~Indcs 12 <br />... Recent Winter Cloud Seeding Programs <br />in the Western U.S. 13 <br />S. Summar")' of Recent Research Results IS <br />5.1 Burcl1U of Reclamation 15 <br />5.2 National Oceanic and Atmospheric Administration 16 <br />6. Potential Additional Research Programs to be Conducted <br />in the West 17 <br />7. Indicated Results from Winter Programs in the West 18 <br />7.1 Research Programs 18 <br />7.2 Opcrutional Programs 19 <br />8. ".):pical Benefit/Cost Ratios 21 <br />9. Summar)' of Capability Statements 22 <br />10. Arcas within the Colorado RiH'r Hasin without Cloud <br />Seeding Programs Currently but ",'ith Good Seeding Potential 22 <br />II. Could Existing Programs be enhanced with Additional Funding'! 25 <br />12. Potential Impacts during Dr)'. Normal and Wet Seasons 26 <br />13. ~Iethods of Evaluating the Effectinness of <br />Cloud Seeding Programs 27 <br />13.1 Statislical Approaches 27 <br />13.2 Ph)"sical Allproaches 28 <br />13.3 J\lodeling Approaches 29 <br />14. Potential Increases in Precipitation and Runoff 30 <br />15. Prelimin:lry Cost Estimates 35 <br />16. POlential Emdronmentallmp.lcts 36 <br />17. Potential Legal Issues 38 <br />18. Conclusions and Recommendalions 39 <br />18.1 Conclusions 39 <br />18.1 Recommendations 39 <br /> <br />Acknowledgements <br />References <br />