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<br />. <br /> <br />\, \,f:, f:, <br /> <br />. <br /> <br />. <br /> <br />an integral part of en active cloud seeding program. Mathe- <br />matical modeling of certain atmospheric processes is receiving <br />attention at the University of Neveda and South Dakota School <br />of Mines. These models :pemit the testing of concepts on a <br />computer without long end expensive field experiments. They <br />cannot, however, replace entirely the requirements for field <br />research. <br /> <br />We elso have studies underwey which will provide new methods <br />to meacure the effectiveness of seeding in the target area. <br />W. E. Howell Associates of Lexington, Massachusetts, Taft <br />College in California, and Colorado State University are <br />engaged in such studies. E, Bollay Associates is testir€ <br />the power spectrum technique as a part of their field experiments. <br /> <br />Also iQportant are studies of the effects of seeding outside <br />the target area. Aerometric Research, Inc. has begun a study <br />of the general effects downwind of a seeded area. They are <br />using historical data now, but expect to test in an actual <br />seeding experiment the theories they develop. A related field <br />test is being conducted by Montana State University. <br /> <br />The research into cloud seeding effects would not be complete <br />without studies of the legal, eeological, and socio-economic <br />factors involved. At present, we are not heavily involved in <br />studying these factora, except as they affect the individual <br />field experiments. <br /> <br />The Bureau has held several meetings to bring our contractors <br />together to exchange infornation. Such an interchange not <br />only reduces delay in disseminating results of scientific <br />studies but also helps to avoid unneceasary duplication of <br />effort and stimulates greater cooperation. Thus the Bureau <br />of Reclamation's Atmospheric Water Resources Research Program <br />is not just a set of independent scientific investigations, <br />but is a coordinated frontal attack on the specific target <br />of increasing precipitation through cloud seeding. <br /> <br />III. Long-range Goals <br /> <br />The 101€-range goals of the Bureau of Reclamation'a Atmospheric <br />Water Resources Program involve both research and operations. One <br />of the .research goals is a systematic study of all parts of the <br />nation to determine the applicability of clOUd seeding in improving <br />water resources. This will require the star.dard climatological <br />data already available, plus such information as the number of <br />natural nuclei present under the various conditions which occur <br />in each area. Other sources of water must also be investigated, <br />including groundwater pumping, processed sewage water, transbasin <br />diversion (such as the COlorado-Big Thompson Project) and others, <br /> <br />15 <br />