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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />The Fraser and Grand Lake weather station precipitation data were used to <br />augment the CBT inflow record. The annual records available for the <br />correlation and augmentation analysis on an annual basis were as follows: <br /> <br />CBT <br />Inflows <br /> <br />Fraser <br />Precipitation <br /> <br />Grand Lake <br />Precipi ta tion <br /> <br />1951-1983 <br /> <br />1910-1973 <br /> <br />1907-1920 <br />1940-1943 <br />1947-1984 <br /> <br />Correlating CBT inflows with both sets of precipitation data in a multiple <br />correlation analysis produced the best results, with a correlation <br />coefficient of 0.422. <br /> <br />A comparison of annual statistics of CBT inflows prior to and after <br />augmentation is presented below: <br /> <br />Before Augmentation <br /> <br />Mean <br />Flow <br />(100 AF) <br /> <br />2826.14 <br /> <br />2755.29 <br /> <br />Standard <br />Deviation <br />(100 AF) <br /> <br />790.84 <br /> <br />789.31 <br /> <br />After Augmentation <br /> <br />Augmentation results in a 2.5 percent reduction in average CBT inflows, <br />with very little change in standard deviation. In this case, the standard <br />deviation is a measure of the distribution of streamflows about the mean <br />value. Approximately two-thirds of all values should fall within the range <br />defined by the mean value less the standard deviation and the mean value <br />plus the standard deviation. The use of the augmented record should, <br />therefore, result in slightly conservative estimates of water availability <br />from CBT since the inflows are slightly lower and more clustered around the <br />mean value than were the historical values. <br /> <br />5-6 <br />