WSP08072

• File Number: 8027
• Description: Section D General Correspondence - Federal Agencies - US DOI-BOR - Region 7
• State: CO
• Basin: Statewide
• Date: 10/18/1967
• Author: Patrick A Hurley
• Title: Augmenting Upper Colorado River Basin Water Supply By Weather Modification
• Water Supply Pro - Doc Type: Report/Study

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In the Upper Colorado River Basin most of the precipitation
during a few big storms, 23/

comes

50/0 of storms produce 250/0 of precipitation

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150/0 of storms produce 500/0 of precipitation
350/0 of storms produce 750/0 of precipitation

An average of some 20 to 30 storms yielding over. 01 inch precipita-

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tion should be ~xpected over the target areas during the 6~month,
November through April, seeding season, 24/

Only three large storms producing over 0.40 inches can be expected

to occur within the areas during a typical year, Since not all storms

are susceptible to precipitation increases by cloud seeding, reliable

operational techniques must be designed to take full advantage of
the rather limited number of good opportunities,

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Anticipated Yield

Capabilities for producing a 15 percent increase in the average

November through April precipitation is assumed likely by the inid-
1970's. Recognizing that indicated precipitation increases of current

cloud seeding operations and experiments are generally in the 10 to
20 percent range and that considerably expanded knowledge and
improved systems should be developed in the next 10 years, the

23/Schleusener and Crow, p 9,
"'lA/Crow.

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