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<br />00073~ <br /> <br />Combining the promising weather modification opportunities with the <br /> <br /> <br />impending water problems of the Colorado River Basin has generated <br /> <br />considerable interest and discussion, sparked a Senate bill introduced <br /> <br /> <br />by Senator Peter H. Dominick,.2/ and suggested this paper. <br /> <br />This paper is an attempt to sketch, using an understandably wide brush, <br /> <br />the broad picture of the potentials and realities of the concept to augment <br /> <br />Basin water supplies by deliberate modification of precipitation. Further <br /> <br />study can certainly fill in the gaps and adjust any erratic strokes. <br /> <br />Background <br /> <br />Although this paper is essentially water resource orientated, centering <br /> <br />around precipitation- runoff relations and economic evaluations, it is <br /> <br />set against a background of advances due to scientific experimentation <br /> <br />and commercial cloud seeding operations which led to more accepted <br /> <br />and serious considerations of weather modification. It is also set <br /> <br />against a background of highly recommended plans for greatly expand- <br /> <br />ing weather modification research in a vigorous and comprehensive <br /> <br />manner. <br /> <br />The concept of using weather modification to enhance natural water <br /> <br />supplies is not new. A 1950 report of the President's Water Resources <br /> <br />3/ "Upper Colorado R1Ver Basin Weather Modification Act, " Senate <br />Bill 2058, 90th Congress, 1st Session, June 1967. <br /> <br />2 <br />