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FOREWORD The California DW'"R (Department of\Vater R.esources) has the responsibility to help protect, conserve, develop and manage California's water for present and future needs. Paramount in this responsibility is the examination of current water use and supply, and development of plans to meet the water needs of a continually increasing population that has grown from 24 million to 30 million between 1980 and 1990, and is expect.ed to increase t{) 40 million by 2010. Snowpack augmentation through cloud seeding is a nonstructural and environmentally preferred alternative for increasing water supplies. Cloud seeding in California has been used for over 40 years. From 1987 through 1991, the DW'"R, in cooperation with R.eclamation (Bureau of Reclamation), designed a snowpack augmentation research project and prepared the required EIS (Environmental Impact Stat.ement). Three preliminary field programs were conducted during the winters of 1988-89, 1989-90, and 1990-91. During these three wint.ers, remote liquid propane dispenser testing was conducted under actual field conditions. The winter of 1991-92 marked the commencement of the planned five-year experimental LOREP (Lake Oroville Runoff Enhancement Project). The LOREP, funded by the California 8\\'1> (State \Vater Project) contractors, was deSIgned to increase runoff to Oroville Reservoir, the largest reservoir of the 8\\'1>, through seeding ofwint.ertime orographic clouds. Seeding was performed along the Sierra crest above the lVIiddle Fork Feather River, using ten remotely operated liquid propane dispensers, during the 1991-92, 1992-93, and 1993-94 winter seasons. The LOREP was suspended after completion of only three years of the intended five-year project. D\VR management suspended the project prematurely because of circumstances that indicated that the LOREP could not be successfully completed on schedule. This report constitutes the final report on the LOREP (Lake Oro"\-ille Runoff Enhanc.ement Project). Appendix A provides the 1993-94 field season budget breakdown for the LOREP. 111