WMOD00413

• Title: Validation of Precipitation Management by Seeding Winter Orographic Clouds in the Colorado River Basin
• Date: 9/1/1993
• Weather Modification - Doc Type: Report

TABLES

Table

4.1 Instrumentation needed for direct detection experiments . . . . . . . .
9.1 CREST program costs in thousands of 1993 dollars with no escalation.
9.2 CREST program labor in FTE's (full-time equivalents) . . . . . . . . .

FIGURES

Figure

1 Conceptual model of orographic cloud with SLW zone and AgI seeding plume
2 Grand Mesa experimental area and surrounding terrain . . . . . . . . . . . .
3 Wasatch Plateau experimental area and surrounding terrain . . . . . . . . . . .
4 Map and cross-sectional view of composite terrain for proposed experimental areas
showing approximate instrument locations . . . . . . . . . . . . . . . . . . . .
5 Reproduction of figure 2 from Super and Heimbach (1988) showing north-south
mean distributions of IPC and SLW content, with the origin 17 km east of the
seeding site, for indicated numbers of passes and altitudes on January 15, 1985
6 The CREST program timeline ... . . . . . . . . . . . . . . . . . . . . . . . . .

APPENDIXES

Appendix

A Colorado River Basin experimental site selection .
1. Overview of experimental area characteristics .
2. Site selection factors .
2.1 High terrain . . . . . . . . . . . . .
2.2 Aircraft sampling . . . . . . . . . .
2.3 Surface instrumentation and access
2.4 Seeding agents . . . . . . . . . . . .
2.5 Time and distance for ice particle growth and fallout
2.6 Precipitation measurements .... . . . . . . . . .
3. The ideal experimental barrier . . . . . . . . . . . . . .
4. Procedures for selecting the best experimental sites. . .
4.1 Exclusion of barriers that are too small, too low, or have wilderness areas
4.2 Rating factors . . . . . . . . . . . . . . . .
4.2.1 Practical low-level aircraft sampling.
4.2.2 Airspace conflicts .
4.2.3 Winter road access
4.2.4 Snowmobile access
4.2.5 Conifer forest cover
4.2.6 Along-the-wind extent
4.2.7 Proximity to adequate airport
4.2.8 Societal opposition ......
4.2.9 Shadowing by upwind mountains
4.2.10 Proximity to a town. .
4.2.11 Major axis . . . . . . .
4.2.12 Wilderness area effects
4.2.13 Avalanche danger. . .

5. Selection of best experimental areas
5.1 White River Plateau . .
5.2 GrandMesa . . . . . .
5.3 Uncompahgre Plateau.
5.4 Boulder Mountain .
5.5 Wasatch Plateau. .
5.6 Chuska Mountains

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