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<br />PART II <br /> <br />~~~. <br />~)% <br />. <br />%;~~ <br /> <br />o IHH?" <br /> <br />HOW WEATHER MODIFICATION CAN CHANGE <br />THE WATER RESOURCES PICTURE <br /> <br />New knowledge gained during the past two decades has demonstrated <br />that man has crossed the threshold of learning how to modify the <br /> <br />weather to increase precipitation. In view of critical water short- <br /> <br />ages, periodic droughts, and other national water problems, there <br /> <br />is a clear need to advance this new knowledge to the point where we <br /> <br />I;~?~ <br />..-.-;"!,;-~,;.$~i;.p <br /> <br /> <br />possess proven techniques and tools needed for obtaining additional <br /> <br />water supplies from the atmosphere. <br /> <br />The new knowledge that has led to this point has been steadily acquired <br /> <br />through basic and applied research on cloud dynamics, microphysics, <br />and cloud-environment interactions. Scientific advances incombina- <br /> <br />tion with new and improved meteorological and specialized cloud phys- <br /> <br />ics instrumentation, and development of more effective treating agents <br /> <br />and techniques, make definitive cloud modification experiments pos- <br /> <br />sible. Our increased understanding of the interaction of cloud micro- <br /> <br /> <br />physics and other cloud processes increases our opportunity to under- <br /> <br />stand the role of artificial seeding in the modification of the natural <br /> <br />cloud system. <br /> <br />This progress establishes precipitation modification <br /> <br />on a firmer scientific basis and makes possible the engineering of <br /> <br />precipitation enhancement systems. <br /> <br />6 <br />