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<br />:-\ <br />1 <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I I <br />I <br />, <br /> <br />I <br />I-- <br />I <br />I <br />I <br />I <br /> <br />6.0 SUMMARY AND RECOMMENDATIONS <br /> <br />A third winter season of cloud seeding operations was conducted over the Willow <br />Creek Drainage located in north central Colorado. The program was operated during a <br />six month period between November 1, 1994 and April 36, 1995. As in the earlier' <br />seasons, seeding was accomplished using 15 ground based silver iodide generators. <br />There were 31 seeding episodes during the operational period in which the generators <br />were operated a total of 2,146 hours. <br /> <br />An evaluation of the third season of operations, based on a target-control <br />comparison of April 1 snowpack (water content), indicates that a possible increase of <br />approximately 9.9 percent occurred. Taken together with the results of the two prior <br />seeded seasons, the analysis indicated an average 16.2 percent increase per year. <br /> <br />An additional evaluation using precipitation data has been performed for the fIrst <br />time. A target/control comparison of December 94 through April 1995 indicates a <br />possible increase of 18.8 percent occurred. The three year average result indicates a <br />possible 23.1 percent increase per year. <br /> <br />The operational design of the program worked well again this year. In general, <br />the CNG network distribution offers good site locations for the primary air flow <br />situations. However with three years of operation now completed an analysis of CNG <br />operation indicate that site #1, "Windy Gap" has been used only about 10 % of the time. <br />Other sites range from near 20 percent to near 60 % . The reason for the lower usage at <br />this site is mostly due to wind flow. At the Windy Gap CNG site, winds from the south- <br />southeast are most favorable for its usage, and those wind directions have occurred <br />infrequently during storm periods that have affected the target area in the past three <br />winter seasons. To increase the efficiency of the program and increase the amount of <br />seeding material that reaches the intended target, it is recommended that this site be <br />removed from its present location and installed in an area to the west. This would <br /> <br />6-1 <br />