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<br />This report is the result of a week-long workshop which evaluated <br />the effect of weather modification upon the major forest insects and <br />diseases. It was attended by five scientists familiar with the for- <br />est insects and diseases, the soils, water, and vegetation of the <br />American River Basin. Biographical data on the participants are <br />listed in the appendix. <br /> <br />" <br /> <br />Major vegetation species of the Sierra Nevada are listed in the work- <br />shop II report, "An Evaluation of Possible Effects of Weather Modifi- <br />cation Upon Vegetation in the American River Basin, California." <br /> <br />ASSUMPTIONS <br /> <br />It is not known which circumstances will call for weather modifica- <br />tion, nor are there quantitative data on the magnitude of changes <br />that might occur. The analysis presented in this report is based <br />on several assumptions. It is assumed that snow augmentation will <br />occur only in years of subnormal and near-normal snowpack and will <br />not produce abnormally high levels ofprecipi tat ion . The overall <br />increase in precipitation is expected to be about 10 percent annually. <br />Because of uncertainties in augmentation effects, however, increases <br />of 10 to 15 percent were considered in this evaluation. Terrperature <br />change would not be expected to be noticeable; some air cooling would <br /> <br />1-4 <br />