WMOD00155

• Contract/Permit #: #94-6
• Applicant: North American Weather
• Project Name: Willow Creek Basin
• Date: 11/1/1993
• Weather Modification - Doc Type: Report

Table of Contents

.,

Section

Pal!:e

1.0 INTRODUCTION.................................. 1-1

2.0 TIIEORY OF CLOUD SEEDING FOR
PRECIPITATION AUGMENTATION. . . . . . . . . . . . . . . . . . . . . . 2-1

3.0 NAWC FACILITIES ................................ 3-1

3.1 Field Equipment and Locations . . . . . . . . . . . . . . . . . . . . . . 3-1
3.2 Office Facilities ............................... 3-4
3.3 Personnel................................... 3-5

4.0 OPERATIONS.................................... 4-1

4. I Operational Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.2 Operational Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4.3 Operational Weather Summary ...................... 4-3

4.3.1 February 1994 . . . . . . . . . . . .. . . . . . . . . . . . . . . . 4-3
4.3.2 March 1994 ............................. 4-4

5.0 ASSESSMENT OF SEEDING EFFECTS. . . . . . . . . . . . . . . . . . . . 5~1

5. I Background.................................. 5-1
5.2 Evaluation of Snowpack in the Target Area ..... -.-.. . . . . . . 5-3

5.2.1 Selection of Target and Control Areas .... . . . . . . . . . 5-4
5.2.2 Snowpack Results. . . . . . . . . . . . . . . . . . . . . . . . . . 5-5

6.0 SUMMARY AND RECOMMENDATIONS .................. 6-1

Fil!:ure

1.1 Willow Creek Drainage Weather Modification Project Target Area 1-2
3.1 NAWC's Cloud Nuclei Generator Efficiency. . . . . . . . . . . . . . . . . . 3-2
3.2 Cloud Nltclei Generator Field Set-up . . . . . . . . . . . . . . . . . . . . . . . 3-3
5.1 Control and Target Area Stations .... . . . . . . . . . . . . . . . . . . . . . 5-6
5.2 Isopleth Analysis of the Percent of Nonnal Water Content in
the April I, 1994 Snowpack . . . . . . . . . . . . . . . . . . . . . .. 5-10

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