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<br />ORA F T <br /> <br />~ <br /> <br />mixing in the air currents. This system can be operated continuously <br />and unattended for long periods but is limited to use with artificial <br />nuclei. Targeting from the surface, in space and especially time, <br />can be extremely difficult. Frequently, as experienced in the <br />Colorado River Basin Pilot Project, airflow at generator level may be <br />away from the target area while winds at the cloud level are toward <br />it, or stable layers may trap the seeding material near ground level <br />preventing it from reaching the cloud. <br /> <br />Airborne techniques involve the use of an aircraft to deliver both <br />categories of seeding material directly into the cloud at the time <br />and position desired. Airborne techniques, therefore, provide <br />an extremely flexible and controllable method of seeding. These <br />techniques, however, are difficult to employ in conditions under <br />which aircraft flight is restricted, such as severe icing and close <br />proximity to mountains. <br /> <br />D. Evaluation of Results <br /> <br />. <br /> <br />The overall evaluation of a precipitation augmentation program in the <br />Colorado River Basin will consist of several evaluation efforts which <br />will address, but not be limited to the statistical approach, physical <br />investigations, system and technique reliability and applicability, <br />cost-benefit analyses, and social and environmental impacts. Since <br /> <br />,I <br /> <br />45 <br />