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<br />. <br /> <br />work identified potential precipitation increases in 12 major river <br />basins of the Western United States by employment of a cloud seedin9 <br />model which developed precipitation-temperature diagrams based upon <br />~ 20 years of historical precipitation and rawinsonde data. The <br /> <br />potential runoff from combined microphysical and convective effects <br />of weather modification was found to be about 370 000 dam3 <br />(300 000 acre-ft) in the American River watershed and about <br />160 000 dam3 (130 000 acre-ft) in the Truckee River watershed. <br /> <br />e <br /> <br />The Twelve Basin Investigations conclusions clearly indicated <br />additional feasibility research in weather modification technology <br />was merited in the Sierra Nevada as a means of providing future <br />water supply alternatives. <br /> <br />In 1973, the State of California and the Bureau of Reclamation <br />agreed to pursue a research program in the Sierra Nevada designed to <br />refine the technology and determine the feasibility of augmenting <br />runoff by cloud seeding. As a first step in the project, the state <br />and Bureau jointly funded a contract with the Center for Regional <br />Environmental Studies at San Diego State University for an assessment <br />of potential environmental effects that might require investigation. <br /> <br />In 1974, 21 public meetings were held in California and Nevada to <br />solicit comment on the proposed project and the draft report from <br />San Diego State University, IIInvestigations Recommended for Assessing <br /> <br />e <br /> <br />1-3 <br />