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<br />- <br /> <br />CONTENTS <br /> <br />Page <br /> <br />1. Introduction.............................................................. 1 <br /> <br />2. Limitations of statist.ical evaluation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1 <br /> <br />3. Overview of target-control evaluation .......................................... 2 <br />3.1 Choosing measurement sites. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 <br />3.2 Target-control relationships ............................................... 3 <br />3.3 Applying the target-control approach ........................................ 4 <br /> <br />4. Specific Idaho target areas. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 <br /> <br />5. Snowpack snow watE~r equivalent observations ................................... 7 <br /> <br />5.1 Sampling methods ...................................................... 7 <br /> <br />5.2 Choosing control sites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 <br /> <br />6. Evaluation of the Boise target area ..................................... . . . . . . . 9 <br /> <br />6.1 Control sites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 <br /> <br />6.2 Target-control relationships .............................................. 11 <br /> <br />7. Evaluation of the northern portion of the upper Snake target area ................... 19 <br /> <br />7.1 Control sites. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . .. 19 <br /> <br />7.2 Target-control relationships ............................................... 22 <br /> <br />8. Evaluation of the remainder of the upper Snake and the Bear <br /> <br />target areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 27 <br /> <br />8.1 Control sites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 <br /> <br />8.2 Target-control relationships ......................................."...... 28 <br /> <br />9. Physical evaluation of cloud seeding effectiveness ........................."...... 32 <br />9.1 Overview of field operations and generator placement ..................."...... 32 <br />9.2 Estimation of the upper limit for snowfall enhancElment . . . . . . . . . . . . . . . . . . " . . . . .. 32 <br /> <br />10. Conclusions and recommendations ........................................... 40 <br /> <br />11. Bibliography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 43 <br /> <br />TABLES <br /> <br />Table <br /> <br />1 Listing of SCS snow measurement sites used in analysis of the Boise <br />seeding program for target sites, control sites, and sites immediately <br />downwind from the target area ........................................... 11 <br />2 Listing of SCS snow measurement sites used in analysis of the upper <br />Snake seeding program for target sites along the Idaho-Montana border <br />west of Yellowstone Park and control sites west and northwest of the target ......... 21 <br />3 List of 18 non seeded winters in the Bear River drainage from 1954-1955 <br />through 1992-19!~3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 <br /> <br />III <br />