WMOD00266

• Sponsor Name: NAWC
• Project Name: Gunnison Cloud Seeding Annual Report 2004
• Title: The Development, Conduct and Evaluation of a Cloud Seeding Program for the Gunnison River Basin, Colorado During the Winter of 2003-2004 Winter Season
• Prepared For: City and County of Gunnison
• Prepared By: Don A. Griffith, David P. Yorty, Mark E. Solak
• Date: 8/1/2004
• Weather Modification - Doc Type: Report

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TABLE OF CONTENTS

Section

1. 0 INTRODUCTION ................................................................................................ 1
,

2.0 PROJECT DESIGN ............... ............... .......... ....... ..................................... .......... 2

2.1 Background.............................................................................................. 2

2.2 Seedability Criteria................................................................................... 2
2.3 Suspension Criteria......... ...................... .................................................... 2
2.4 Equipment and Project Set-Up ............... ................................................. 4
2.5 Operations Center and Personnel............................................................. 7

3 .0 OPERATIONS.......................................... ..................... .......................... ........... 11

3.1 Operational Procedures ........................................................................... 12
3.2 Operational Summary ............................................................................. 20

4.0 EVALUATIONS OF SEEDING EFFECTIVENESS ........................................ 28

4.1 Precipitation Analysis ............................................................................. 30
4.1.1 Control Area Precipitation Gauge Sites ...................................... 31
4.1.2 Target Area Gauge Sites ............................................................. 36
4.1.3 Regression Equation Development, December - March Period.. 39
4.1.4 Precipitation Evaluation Results ................................................. 40
4.2 Snowpack (Water Equivalent) Analysis ................................................. 42
4.2.1 Regression Equation Development ............................................. 44
4.2.2 Evaluation Results (Snowpack) .................................................. 47
4.3 Potential Seeding Impacts during the First Half of April....................... 48
4.4 Summary and Discussion of Precipitation and Estimated Seeding

Effects...................................................................................................... 49

4.5 Potential Seeding Impacts at the Rocky Mountain Biological

Laboratory.. ............................ ... ........................ ...................................... 55

4.6 Potential Downwind Effects.. ........ ........... ............. ........... ............ .......... 57

5.0 SUMMARY AND RECOMMENDATIONS .................................................... 58

ACKNOWEDGMENTS

REFERENCES