Weather Modification in the Southern Sierras

by R. D. Elliot,
W. A. Lang,


Serial Information: Journal of the Irrigation and Drainage Division, 1967, Vol. 93, Issue 4, Pg. 45-60

Document Type: Journal Paper


This article presents an historical account of 15 yr of continuous winter-time cloud seeding to enhance snowpack in the upper San Joaquin watershed of the southern Sierra Nevada. The project was conducted by a private meteorological consultant firm for a large utility company interested in increased water resources for hydroelectric generation. The equipment employed to generate the artificial nuclei (silver iodide smoke) is described, and the evolution of the nuclei generator network into a partially radio controlled system is discussed. The evaluation of the results in terms of enhanced runoff suggests that the seasonal streamflow was increased by 8.5%.

Subject Headings: Light rail transit | Water resources | Winter | Weather modification | Snow | Watersheds | Project management | Private sector | Nevada | United States

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