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<br />most applicable findings are those from the five-year Colorado <br />River Basin Pilot Project (CRBPP) conducted by the Bureau of <br />Reclamation (now called Water and Power Resources Service) during <br />the period 1970-75. These latest findings indicate the complexity <br />of identifying and treating suitable cloud systems. The most <br />recent efforts of scientists to more accurately identify seedable <br />cloud types will be utilized in this design.5,6,10 It is proposed <br />in this design that the majority of seeding will be done from <br />ground-based systems either remotely or manually operated. About <br />10 to 15 percent of the total seeding may be accomplished with <br />aircraft. The program operational requirements will be identified <br />by five major areas of effort: <br />(I) Opportunity recognition expressed in terms of a <br />seeding criteria <br />(2) Determination of seeding rates. <br />(3) Seeding delivery systems and seeding materials. <br />(4) Opportunity forecasting and suspension criteria. <br />(5) Randomized seeding operations and documentation of <br />activities. <br />Each of these areas will be discussed and the design concepts <br />presented as to how these concepts should apply to this program. <br /> <br />a. Opportunity Recognition Expressed in Terms of an Applicable <br />Seeding Criteria - As weather systems approach Colorado, they <br />are most generally observed initially as moisture at high levels <br />in the atmosphere (between 20,000 to 30,000 feet MSL). The system's <br />moisture deepens from the higher levels in the atmosphere towards <br />the earth. The maximum depth of moisture usually occurs in the <br />vicinity of the surface frontal system and the associated upper <br />air trough. Following the surface frontal and upper trough <br />passage, a marked decrease in upper-level moisture is noted and <br />the remaining moisture on the back side of the weather system is <br />in the lower regions of the atmosphere below about 18,000 feet MSL. <br />In evaluating the CRBPP data, certain seedability characteristics <br />were noted for the pre-trough and post-trough type clouds. 'rhe <br />various meteorological characteristics associated with a cloud <br /> <br />-24- <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I' <br />I <br />II <br />I <br />I <br />