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<br />Weather modification "as eA1Pected to have little impact <br />except in increasing food supply during extreme drought <br />years. <br /> <br />We are currently planning n\"o additional \'\urkshops on: <br />Keather :lodification on non-point source pollution; and <br />Kea~~er nodification on lake and strea~ biota. <br /> <br />(1) Effects of <br /> <br />(2) effects of <br /> <br />Our research has produced a 1200-1400 citation bibliography about <br />weather modification and ecology and we expect to publish it this calendar <br />year. <br /> <br />A Illajor effort has centered on development of a historical cl:ir.iatic <br />data base and simulated effects of weather modification "upon the snow- <br />packs. <br /> <br />As a basis for the evaluation of weather modification upon the ecology <br />of the .~erican River Basin, the available historical data for precipita- <br />tion, temperature, sno~'Pack depth, density, and \"ater content for the <br />Forest Service's Central Sierra Snow Laboratory has been assembled and <br />arialyzed. <br /> <br />The Laboratory is located 1 mile (1.6 kn) north of the A.llerican <br />River Basin at 6900 feet (2103 m) elevation. This elevation is mid"\o.'aY <br />bet\.,;een the lower elevation of the snow zone and the crest of the moun- <br />tains in the central Sierra. <br /> <br />Precipitation data for the past 76 years, taken from the records of <br />three stations, have been used to compile a precipitation record for <br />the area. All stations are \dthin 3 miles (4.8 ko) of one another. <br />We have made double mass plots of data fro~ these three stations and <br />see no deviation as a result of station change. <br /> <br />-18- <br />