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<br />west, north of Durango, the curved mountain crest runs generally east to <br />'Wolf Creek Pass, then south to near the Colorado-New Mexico line (see <br />map in Figure 1). <br /> <br />The basic scientific design ~"as prepared at Colorado State University <br />by scientists who were familiar with the Climax experiment and a previous <br />research program at 'Wolf Creek Pass. The seeding activities were randomized <br />so that approximately half of the days in which conditions were identified <br />as suitable were seeded and the n~maining half were not. The decision to <br />seed or not to seed was drawn froln a computer program that provided a 50/50 <br />opportunity for either decision. Operations began in early November, after <br />the deer-hunting season, and continued until mid-May. Operations were sus- <br />pended when snowpack was much above normal or avalanches threatened. Also, <br />operations were prohibited when southeast winds might blow the silver iodide <br />nuclei toward Silverton and Ouray, which desired no additional snow. Thus, <br />not all possibly suitable days were actually declared experimental, and in <br />five years the program had 147 experimental days: 71 seeded, 76 not seeded. <br /> <br />EG&G, Inc. maintained a meteorological office in Durango, staffed by <br />scientists who monitored and predicted cloud and air flow conditions, made <br />decisions as to seedability, and carried out the seeding operations through <br />a network of 33 ground-based silver iodide generators. This contractor <br />also launched and monitored rawinsonde balloons at three-hour intervals <br />during experimental days, and once each day on non-experimental days, to <br />collect data on pressure, temperature, humidity, and winds at all levels <br />of the atmosphere. Details of EG&G's activities are available in their <br />final report3. <br /> <br />'Western Scientific Services" Inc. established and maintained an exten- <br />sive observatj,onal network which included some 60 recording snow gages on <br />both sides of the San Juan crest study area, several ice nucleus counters, <br />and other recording, sensing, and atmospheric monitoring instruments. <br /> <br />3 <br />Hjermstad, L. M., 1975: CRBPP Final Comprehensive Operations Report, <br />1970-75 Season. Report No. AL-1200, EG&G Inc., Durango', Colorado. <br /> <br />-2- <br /> <br />,. <br /> <br />~. <br />,. <br /> <br />1 <br /> <br />., <br /> <br />.;,~'''':t <br />