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<br />0025n <br /> <br />12 gages per storm would be required. Rainfall gradients, and not <br />simply the area covered by the precipitation pattern, appear to <br />dictate the gage density requirements. <br /> <br />The analysis technique was also used to study the rainfall volume <br />from two storms, using 400 sample sets for each storm. Some periodic <br />variations and biases in results were discovered which could have a <br />bearing on either the design of HIPLEX gage deployment or analysis of <br />the observation sets. <br /> <br />Methods of using the objective analysis of observational data to <br />decrease uncertainty in estimates of total storm rainfall when <br />discriminating between two rainfall patterns were found. A linear <br />discriminant analysis approach using an optimal combination of storm <br />attributes to discriminate between seeded and unseeded complexes was <br />suggested. <br /> <br />All software is available and operational on the Bureau's CYBER <br />computer. <br /> <br />CONTRACTOR: South Dakota School of Mi nes and Technology, <br />Rapi d City, South Dakota <br />CONTRACT NO. 8-07-83-VOOOg <br />PRINCIPAL INVESTIGATOR: Arnett S. Dennis <br />PERIOD: December 15, 1977 - Continuing <br />FUNDING: FY78 - $151,414 <br /> <br />South Dakota School of Mines and Technology has the responsibility of <br />providing basic information for formulating the design plan for a <br />series of HIPLEX exploratory experiments. Researchers are studying <br />the impact of various design options on sample size and statistical <br />requirements of the experimental evaluation. During the experiments, <br />the contractor will review the design and operations periodically. <br />Statistical/physical evaluation of the effects of seeding will also <br />be done. Cooperation with local, State, and Federal agencies will be <br />an important aspect in developing work plans for the experiment. <br /> <br />Following are accomplishments of this contract: <br /> <br />(1) The microphysical aspects of the seeding hypothesis for the <br />first experiment have been studied in detail and, apart from the <br />secondary effects related to ice crystal habit, the hypothesis has <br />been found physically realistic. <br /> <br />(2) A set of response vari ables for this experiment has been <br />defined, and expected differences between seeded and unseeded <br />clouds have been specified. <br /> <br />II 1-32 <br />