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<br />INTRODUCTION <br /> <br />The Bureau of Reclamation, U.S. Department of the Interior, is plan- <br /> <br />ning as a part of its Project Skywater, a 5- to 1-year study of the <br /> <br />effects of weather modification by seeding winter orographic clouds <br /> <br />over the American River Basin of the Sierra Nevada, Calif. The SCPP <br /> <br />(Sierra Cooperative Pilot Project) is being designed to determine <br />the effects of cloud seeding upon the water yield and the ecology <br /> <br />of the basin. At the request of the Bureau of Reclamation, Cooper, <br />et ale [1]1 recommended certain investigations needed to assess <br /> <br />the ecological impacts of the pilot program. The Bureau then con- <br />tracted with the Pacific Southwest Forest and Range Experiment Sta- <br /> <br />tion, Forest Service, U.S. Department of Agriculture,' Berkeley, <br /> <br />Calif., to study the effects of cloud seeding upon the ecology of <br />the affected area. Forest Service personnel will also study the' <br />effect upon snowpacks and subsequent water deli very to streams. The <br /> <br />study will use data from within the basin and from the Forest Service <br />CSSL (Central Sierra Snow Laboratory), north of the basin. <br /> <br />Part of the research, particularly that dealing with the effects upon <br />hwnan population of the basin, will be done under contract by others. <br /> <br />1 Numbers in brackets refer to items in the bibliography, included <br />as part of an appendix at the end of this report. <br /> <br />1-2 <br />