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groups, and state and Federal agencies. Citizen groups including water users and resource managers have expressed their concerns about future shortages and have advocated augmentation efforts in the Basin. . A recent coordination activity was a public meeting held in Durango, Colorado, August 30, 1979, by the Colorado Department of Natural Resources. As the state agency responsible for regulation of weather modification, the Department wished to obtain initial public response to a proposal for a possible cloud seeding project in western Colorado. The meeting followed distribution of the May 1979 "Conceptual Plan to Develop Water Augmentation By Weather Modification in The Colorado River" by the Office of Atmospheric Resources Management. Participants responded with general support for research activities, and pointed out that many local groups in Colorado now sponsor operational cloud seeding programs to increase winter precipitation. Some participants were concerned about possible extended area effects, above-normal snow increases, possible disbenefits including impacts on wildlife and livestock, and methods of compensation for danages. The Project Skywater Office recognizes the legitimacy of these questions and will seek answers to these matters as the program advances. 3. Dr. Bernard A. Silverman described the scientific basis for continued precipitation management activity in the Colorado River Basin. Many prior studies in Colorado, Utah, California, and Washington have contributed to the current knowledge of cloud seeding capability in mountainous areas. The Weather Modification Advisory Board Report to the Secretary of Commerce strongly advocated winter orographic seeding as the most advanced, significant cloud seeding method to increase water supplies. A series of meetings have been held to further clarify the scientific basis, the risk of possible negative effect, important program elements requiring clarification, and timetables. Scientists have identified a requirement for an intensive period of physical studies, followed by a preoperational period. To accelerate the timetable for learning, several studies will be undertaken in parallel. It is a matter of trading time for dollars. New, more sophisticated equipment is available to measure and evaluate cloud systems and the chain of physical events occurring in winter storms. The objectives of the pre- operational activity will be to determine how the operational program should be conducted. Transferability of the technology to other areas will also be studied to optimize its use and benefits.