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<br />have been seeded on control days. But to investigate the actual <br />seeding effects, shorter periods must be studied with respect <br />to atmospheric conditions as well as actual seeding. <br /> <br />"* * * it is concluded that there is evidence of three-hour <br />interval precipitation increases in the crest area when the <br />wind flow normal to the barrier is light to moderate and <br />the cloud depth is not great. There is evidence of precipi- <br />tation decreases in the crest area and also in the upwind <br />flanks under conditions of deep clouds with high wind flow <br />normal to the barrier. There are indications of precipita- <br />tion increases in the Rio Grande River basin, including the <br />San/Luis Valley area under almost all conditions. Thus, it <br />appears that seeding may have increased precipitation in the <br />target area in some cases, decreased it in others, but most <br />likely increased it overall in the downwind area. It is <br />ironic that popular concern has centered on the possibility <br />of robbing the downwind areas of precipitation! <br /> <br />"Although the Colorado River Basin Pilot Project has many and <br />varied meteorologic objectives during the research phase of <br />the project, the ultimate objective and long-term goal is <br />directed toward development of operational techniques to <br />increase surface runoff and water supply through weather modi- <br />fication. Consequently, hydrologic analysis has been incor- <br />porated as one of the techniques for overall evaluation of the <br />project and interpretation of meteorologic results. <br /> <br />"Even though it may be impossible to detect an observed incre- <br />mental quantity of runoff resulting from weather modific:ation <br />during the conduct of the Colorado River Pilot Project, it is <br />entirely within the state of the art to derive analytically <br />the quantity of incremental runoff anticipated from the target <br />area as a result of actual or hypothetical increases in pre- <br />cipitation developed in the meteorologic phase of this investi- <br />gation. In order to estimate magnitude and time distribution <br />of incremental runoff from the target and adjacent areas, a <br />hydrologic model has been developed for thirteen sub-watersheds <br />in and adjacent to the intended target. <br /> <br />liAs soon as results are available from the meteorologic phase <br />of the investigation, the hydrologic model of the San Juan <br />massif will be operated to develop the required hydrologic <br />information. II <br /> <br />15 <br />