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<br />was prepared by the Colorado State University, hereinafter referred to as <br />the csr design study (Grant et a1. 1980). In the preparation of that <br /> <br />- --~ :--.~- - - <br />study, broad-based assistance was sought from weather modification <br />researchers, weather modification users, and commercial operators. <br /> <br />In the _<:~U__~esign stu~Iy, several areas of research were identified <br />as having highest priority for the first year. These areas are divided <br />into two main ones, 1) hypothesis evaluations and 2) statistical analysis <br />of precipitation changes. In the first area, three primary aspects were <br />ident ified; these relate to disposition of ice nuclei after release, <br />the spatial and temporal distribution of supercooled water and the <br />trajectories of cloud and precipitation particles. In the second area, <br />emphasis was placed on development of meteorological controls (co- <br />variates) for use in statistical analysis, the making of several alter- <br />nate analyses of past operations, and providing recommendations on <br />controls, data usage and sample stratification for use in assessment of <br />future operational programs. <br /> <br />Research ana evaluation of pr1Ulary aspects of the cloud seeding <br />project identified in the CSU design study were carried out by the <br />Utah State University (USU). Assistance for auoorne data collection <br />was provided by the [niversity of Washington (l~). <br /> <br />It 1S the goal of this report to describe the field research <br />effort, the analysi s of data and statistical evaluation of hi storical <br />data, and to make conclusions where possible regarding the effectiveness <br />of cloud seeding in an ongoing winter operational project in Utah. <br />Other related aspects of scientific interest are also a significant <br />part of the research. <br /> <br />1.1.2 Scope of project. Other important aspects of evaluation were <br />identified in the eSG design study, such as seeding materials generation, <br />systems operations, spatial and temporal extent of seeding effects, and <br />value issues (economics, legal-political, social and environmental <br />aspects). These assessment areas were recommended for later evaluation. <br />The pr1mary areas relating to hypothesis evaluations and statistical <br /> <br />2 <br />