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<br />;.: <br /> <br />... <br /> <br />~ <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />3.2 <br /> <br />An important DR! research goal is to determine the targeting <br />effectiveness of the coordinated seeding program, This will be accom- <br />plished through a snowpack sampling and chemical analysis program. <br />The program will determine if, when and where silver iodide released <br />from the overall generator network is reaching the intended overall <br />target area, Evidence of seeding effectiveness will be obtained by <br />measuring the amount of silver (coming from the silver iodide seeding) <br />in snowfall sampled at 12 sites in the overall target area, <br /> <br />The data will shed light on the temporal and spatial distribu- <br />tions of silver in the overall target area. This information will be <br />compared with knowledge of which generators were operating and when, <br />The silver data will also be used to identify when ground-based seed- <br />ing may have led to additional precipitation at the sampling sites, <br />precipitation data from gauges collocated at the snow sampling sites <br />will be used in this part of the study. Where appropriate within <br />these studies various stratifications of the results will be made <br />using wind velocities and temperature information, Past investiga- <br />tions by DR! have shown targeting effectiveness of seeding northern <br />Sierra storms to depend on the wind direction, <br /> <br />The goals described above have led to the following experimental <br />work plan. <br /> <br />A, Field Plan: <br /> <br />During the 1986-87 winter season (3 November 1986-9 January 1987) <br />snowpack sampling expeditions will be conducted after every seeded <br />storm producing significant sno~7fall in the target area, A significant <br />storm for the purpose of this work is defined as one producing about <br />