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<br />CHAPTER 1 <br />INTRODUC TION <br /> <br />This report summarizes five winter seasons of weather modification <br />research activities from 1970 through 1975 in a portion of the San Juan Moun- <br />tains of southwestern Colorado. The randomized seeding operations for this <br />program, the Colorado River Basin Pilot Project, were conducted by EG&G <br />Inc. under Contract No. 14-06-D-6963 through the Department of the Interior <br />with the Bureau of Reclamation. If the reader desires further or specific <br />information or meteorological or seeding data not found in the summaries <br />included in this report, the reader is direc:ted to the Annual Comprehensive <br />Data and Seeding reports prepared by EG&G Inc. and submitted to the Bureau <br />of Reclamation following each of the five operating seasons. (Address: Chief, <br />Division of Atmospheric Water Resources Management, Bureau of Reclamation, <br />Building 67 Code 1200, Denver Federal Center, Denver, Colorado 80225). <br /> <br />I . <br /> <br />I <br /> <br />1. I PURPOSE AND OBJECTIVES <br />The purpose of the Colorado River Basin Pilot Project was to provide <br />a sound evaluation of precipitation increasE~S from an operational-type research <br />wintertime weather modification program over large areas. <br />EG&G's objective within this Pilot Project was to establish and operate <br />a ground-based instrumentation network to provide meteorological data in and <br />near the project area, and to establish and operate a ground-based silver iodide <br />seeding system to increase snowfall in the proj ect area. EG&G also was to <br />establish, refine, and provide sound scientific weather modification procedures <br />for producing increases in snowfall over large areas of the San Juan and adjacent <br />mountains for future, fully operational weather modification programs. <br /> <br />1. 2 BACKGROUND FOR PROJECT LOCATION AND DESIGN <br />Wintertime weather modification research programs in the early and <br />mid 1960's by Colorado State University near Climax, Colorado and at Wolf <br />Creek Pass, Colorado showed with statistical significance that winter precipi- <br />tation was substantially increased during certain identifiable storm situations <br />using ground-based silver iodide generators. The experimental field testing of <br /> <br />1-1 <br />