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<br />Ou2~\J(; <br /> <br />"The evaluation of the experiment will test the primary <br />hypotheses of the program in addition to evaluating those <br />physical parameters accompanying apparently successful <br />and/or unsuccessful snowpack augmentation events. Non- <br />parametric and parametric statistical techniques will be <br />applied to the randomized seed and nonseeded data to <br />conclude whether each hypotheses is true and supported <br />by the experimental data. The basic parameters to be <br />statistically tested for each are: <br /> <br />(1) The average precipitation accumulation; <br />(2) The elevation of the maximum precipitation band; and <br />(3) The average total storm duration, the average duration <br />of precipitation during the first and last days of <br />the storm, and the average rate of precipitation. <br /> <br />"Physical phenomena which have been found important in <br />previous programs and are postulated as important in the <br />present program will be collated with seeding and precipita- <br />tion records to assess their effect on seedability. These <br />parameters include: cloud top height and temperature, wind <br />speed and direction, liquid water content, mixing ratio, <br />and atmospheric stability. These data will be used to <br />develop classifications or categories within the data and <br />as independent variables for various multivariate analyses." <br /> <br />~ <br />~ <br />.' <br /> <br />~ <br />~ <br /> <br />Related Considerations <br /> <br />The recommendations of San Diego State Unversity's Center for <br />Regional Environmental Studies were used as a guide in MBA's <br />consideration of hydrologic and meteorologic concerns in the <br />initial design study. The Executive Summary of MBA's Final Report <br />relates those recommendations concerning environmental matters to <br />factors in the experimental design. A synopsis of that section <br />of the Executive Summary follows: <br /> <br />I <br />p <br /> <br />Meterologic Considerations: Generally, effective cloud seeding <br />should be expected to increase the rate and affect the distribu- <br />tion of the precipitation. Duration of precipitation should not <br />be affected by more than a few hours because of the inefficiency <br />of seeding postfrontal cloud bands and because precipitation <br />enhancement depends on the presence of natural potential. The <br />precipitation may be redistributed up or downslope, depending on <br />the seeding rates and whether the precipitation is orographic or <br />convective. The altitude of the precipitation determines the <br />physical characteristics; whether rain, graupel, or snow falls <br />depends on the temperature and hence is related to the elevation. <br /> <br />, <br />, <br /> <br />27 <br />