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<br />0025[;2 <br /> <br />furrow and sprinkler irrigation requirements significantly, resulting <br />in reduction of irrigation costs and energy consumption. Increased <br />rainfall could produce approximately $1.6 million in additional net <br />income from dryland crop and livestock production in the HIPLEX <br />region. <br /> <br />A precipitation climatology investigation of 55 years of records <br />shows that mid-May to mid-June is the most desirable time to conduct <br />research experiments. A study of the climatological characteristics <br />of convective rain cells in and around the southern HIPLEX site <br />revealed that certain features of the National Weather Services WSR-57 <br />radar biased the study. The contractor has suggested alternatives to <br />minimize the problem in the future. <br /> <br />CONTRACTOR: Colorado State University, Fort Collins, Colorado <br />CONTRACT NO. 14-06-D-7630 <br />PRINCIPAL INVESTIGATORS: David Reynolds and Thomas Vonder Haar <br />PERIOD: November 1, 1974, to December 31, 1975 <br />FUNDING: FY75 - $10,749 <br />FY76 - $21,498 <br /> <br />The purpose of this contract was to develop and demonstrate tech- <br />niques using satellite imagery to aid in the design, operation, and <br />analysis of the HIPLEX. Results show that analysis of satellite <br />imagery and soundings can be applied to HIPLEX in four important <br />areas: <br /> <br />(1) Climatological cloud population study for design of HIPLEX <br />and evaluation of area of effect. <br /> <br />(2) Analysis of individual cloud cases to develop an under- <br />standing of the mechanisms that trigger and promote growth in <br />cumu 1 us clouds and cloud systems. <br /> <br />(3) Development of satellite estimates of rainfall over large <br />are as . <br /> <br />(4) Analysis of temperature and moisture in large-scale weather <br />systems from one point to another. <br /> <br />During the 1975 HIPLEX field season, each site was provided with <br />real-time satellite information which was useful in locating the best <br />areas for aircraft flights. Progress was made in demonstrating how <br />satellite imagery can be used with radar, aircraft, and rawinsonde <br />studies to trace the evolution of a cloud. A review of satellite <br />data has confirmed the representativeness of each site to its region <br />(north, central, south). <br /> <br />III-15 <br />