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<br />studies of seeded plumes and systems reliability testing of <br />the prototype cloud seeding generators under development. <br /> <br />The results of the research efforts during the 1985-86 <br />field season on the Grand Mesa of Colorado have been reported <br />in other publications, including NAWC's interim report to <br />the Bureau in December, 1986 (Thompson, 1986). They will <br />not be repeated herein, except to say that several successful <br />and interesting microphysical experiments indicated that not <br />only were physical changes noted within the seeded cloud mass, <br />but at ground level as well. Moreover, the seeded plumes <br />from both aerial and ground releases were routinely tracked <br />for several miles downwind using an airborne ice nucleus counter <br />similar to that used in the work reported by Super (1974). <br />Ground-released plumes were frequently found to rise to elevations <br />over 2,000 feet (610 meters) above the top of the Grand Mesa <br />implying they should enter the portion of the clouds containing <br />supercooled liquid water during storm conditions. Ground <br />released plumes were observed within the cloud mass during <br />some of the microphysical experiments. <br /> <br />Plans were being formulated for additional research studies <br />on the Grand Mesa during the 1986-87 winter season when it <br />was learned that, because of budgetary limitations, the Executive <br />Director of the Colorado Department of Natural Resources had <br />ruled to not grant any cloud seeding permits in Colorado during <br />the 1986-87 Fiscal Year. Coincidentally, the Bureau received <br />an inquiry from the Arizona Department of Water Resources <br />(which represented a number of interested water users within <br />Arizona) in regard to whether cloud seeding technology would <br />be a viable approach to augment water supplies within portions <br />of Arizona. After discussions between the two agencies, it <br /> <br />1-3 <br /> <br />I <br />I <br />I <br />I <br />, <br />I <br />I <br />I <br />I <br />I <br />I <br />t <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />