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<br />. <br /> <br />flow at each percentile level (e.g., the 80th percentile) is <br /> <br /> <br />that which will be equaled or exceeded that percent (i n thi s <br /> <br /> <br />case, 80 percent) of the time. <br /> <br />~. <br />-.J <br />U1 <br />(,n <br /> <br />Hydrologic data, however, were not available until late in <br /> <br /> <br />1978. It was not until after the 15th of January. 1979 that <br /> <br /> <br />the CIFSG had recei ved from the BR computer pri ntouts for <br /> <br /> <br />present condition flows and those projected for various levels <br /> <br /> <br />of development in the year 2000. On January 14, new hydrologic <br /> <br /> <br />computat ions were rece i ved from Dr. Ganter coveri ng present <br /> <br /> <br />conditions and two of four schemes (cases) for making waters of <br /> <br />. <br /> <br />the upper White River available for oil shale development. <br /> <br /> <br />Also received at that time was one scheme for delivering water <br /> <br /> <br />for EET development on the Colorado River near Cameo. Between <br /> <br /> <br />the 16th and 29th of January, Dr. Ganter provided data for two <br /> <br /> <br />additional cases on the upper White River, additional data for <br /> <br /> <br />the Colorado near Cameo, and data for the lower White River as <br /> <br />impacted by development of coal gasification. <br /> <br />d. Data Used by the CIFSG (see attachment E). <br /> <br />The discharge data used by the CIFSG were the median monthly <br /> <br /> <br />flows and the 80th percentile of the mean monthly flows for the <br /> <br /> <br />period of record. <br /> <br />. <br /> <br />The median of the monthly averages has the attribute of remov- <br /> <br /> <br />ing to a degree the effect of extremes of either high or low <br /> <br />43 <br />