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<br />the period from time of generator turn-on to three hours aft:er <br />generator turn-off would be used in this evaluation of seeding <br />effects. This would apply only for precipitation gages located <br />either within or immediately upwind or downwind of the target <br />area. The time period for distant gages used in the evaluat:ion <br />of extended area effects would have to be adjusted slightly to <br />allow for the time differential involved in the movement of <br />weather systems across the State of Colorado. This informat:ion <br />should be documented by the seeding contractor in real time while <br />the weather event is in progress. <br />In addition to analyses of precipitation data for seeding <br />effects within the project area and possible extended area <br />effects, evaluations should be made on the efficiency of seeding <br />operations, accuracy of targeting the seeding material and cost <br />benefits as determined from the estimated value of the augmented <br />precipitation. The targeting evaluation should include the <br />analysis of snow samples collected within and surrounding the <br />program area following both seeded and non-seeded events. These <br />samples should be analyzed for silver content and possibly for <br />other tracer materials such as rubidium and cesium, which are <br />uncommon in the atmosphere and which can be detected at picogram <br />levels in flame photometry tests. A potential problem with using <br />a solution containing ribidium or cesium is that the resulting <br />nuclei do not react as quickly as nuclei from a silver iodide- <br />ammonium iodide solution.13 Therefore, solutions containing these <br />tracer materials should be used only for special experiments which <br />are in addition to the basic program. <br /> <br />2. Sdciological Areas <br />The impact of the proposed weather modification program on the <br />local populace needs to be evaluated in terms of the effectiveness <br />of the program's ongoing information effort and the public's <br />acceptance of cloud seeding operations. While potential benefits <br />from the program need to be stressed, the possible areas of dis- <br />benefits need to be identified and evaluated. <br />Cost data related to the cumulative snowfall during the <br />winter periods spanned by the proposed program need to be evaluated <br /> <br />-44- <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />