CWCB Wintertime Weather Mod Report

• Project Type: General OWC
• Applicant: Weather Modificaton
• Project Name: Colorado Weather Modification Program
• Title: CWCB Wintertime Weather Modification Report Fall 2002 - Spring 2003
• Date: 7/1/2003
• Water Conservation - Doc Type: Final Report

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ReCEIVED
JULIO 2003

OtlO1lldo Water Conservation Board
CLOUD SEEDING - 2002-2003

A Summary of Cloud Seeding
Operations by Water Enhancement Authority

During the winter of 2002-2003, a clouding-seeding program was conducted by
Water Enhancement Authority over Grand Mesa and the West Elk Mountains in Western
Colorado. The program as sponsored by the Grand Mesa, Crawford, Fruitland and
Colbran Conservancy Districts, and KannahCreeklCity of Grand Junction, Water
Enhancement Authority operated under Colorado Weather Modification Permit No. 2000-
3.

This cloud seeding program was operated with thirteen (13) ground-based
generators located around the target area. (A map is attached showing the target area and
generator locations.) Two generators(No.s 4 & 13) that had not been operational for the
last three years were put back into use this year at the request of the main sponsors, the
Grand Mesa Conservancy District. Generator operators were contacted by telephone and
told when to start and slop their generators. Generators were filled with a solution of 2%
( by weight) of silver iodide and acetone. This mixture was burned with propane.
Approximately six (6) grams of silver iodide were released per hour of operation per
generator.

The Water Enhancement Authority started its program on December 12. 2002 and
suspended operations on April 12, 2003. During this period there were seventeen (17)
seedable storms. Approximately 8001 grams of silver iodide were released. Following is
a list of storm dates and generators operations:

STORM #1 DATE' 12/12/02
Generators operated: 4,6,7,8,9,10,12
Total hours: 54.5
Total grams AGI: 327

STORM #2 DATE' 12/17/02
Generators operated: 3,4,6,7,8,9,10,11,12
Total hours: 74
Total grams AGI: 444