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<br />-14- <br /> <br />predictor variable. The greatest mean rain on a rainy day in North <br /> <br />c:' <br /> <br />Dakota usually comes with a southwest wind in June. <br /> <br />Another approach to the "assessment" problem has been to inves- <br /> <br />tigate "what if" scenarios. What if rainfall could be increased by <br /> <br />one inch over this area at this time; then, what would be the impact <br /> <br />on agriculture? Several agencies and people have done this. Some <br /> <br />of the best studies have been done in Kansas and North Dakota. <br /> <br /> <br />~ <br /> <br /> <br />;~ ......... <br />~ -~.~ <br /> <br /> <br />< <br /> <br />!..,. <br />_.~ <br /> <br />+75% <br />" :, <br /> <br />Less Than <br />0.10 inch <br /> <br />~\ <br /> <br /> <br /> <br />~ <br /> <br />+30% <br />11'01/1 i~\L <br /> <br />./ <br /> <br />+10% <br />~J11 J:[,'l1 . <br /> <br />0.11-0.50 inch 0.51-1.00 inch <br /> <br />Over 1 inch <br /> <br />a.aa,e in daily precipitation assumed to occur if convective clouds were <br />seeded to iac:rease raiofall, <br /> <br />Source: L. D. Bark, O. H. Buller, and <br />R. L. Vanderlip, 1979. <br /> <br />Weather modification could deliver an extra inch of rainfall <br /> <br />in many different ways. If the increase were to be associated with <br /> <br />the many light showers, farmers would usually benefit. Ranchers <br /> <br />would have their stockponds more easily filled if the rain were to <br /> <br />" <br /> <br />fall from the relatively fewer heavy showers. The picture above <br /> <br />shows one scenario which weather modification experts consider likely <br /> <br />to result from cloud seeding. Both the North Dakota and the Kansas <br /> <br />studies made use of this model in their impact evaluations. <br />