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<br />over the entire Basin. Additional physical measurements would be taken <br />to obtain information needed to optimize precipitation increases from <br />cloud seeding. Concurrent studies would be conducted in the remaining <br />subbasins to obtain information to determine under what conditions the <br />seeding methods used in this phase could be transferred to other <br />subbasins, or what modifications would be required. <br /> <br />The advantages of this option include increased water supply in two <br />subbasins would be available in 3 years. Also, the intensive two- <br />subbasin program permits reduction of the first phase time requirement <br />from 5 to 3 years without incurring undue scientific and social risks. <br />The two-subbasin concept also improves the prospects of the transfer of <br />the technology from the test subbasins to the remaining candidate areas <br />within the Basin. The disadvantages of this option are that the <br />shorter time period allows less time for improvement of the existing <br />technology. Also; this option has the highest total cost of the three <br />action options. <br /> <br />J <br /> <br />3. Six-year Program <br /> <br /> <br />The 2-year initial phase of this option would immediately apply existing <br />knowledge to design a 4-year dual subbasin demonstration phase. In <br />order to reduce the uncertainty about the frequency of seeding oppor- <br />tunity, storm variability, and seeding mode operations throughout the <br />Basin, two subbasins would be instrumented simultaneously. Basin-wide <br />climatological studies to determine storm types and seeding opportun- <br />ities would be initiated during the initial phase and continued through- <br />out the second phase. <br /> <br />7 <br />