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<br />I <br />I <br />I <br />I <br />I <br /> <br />Period <br /> <br />Required <br />Release <br /> <br />October - April <br />May - July <br />August <br />September <br /> <br />27 cfs <br />7S cfs <br />40 cfs <br />20 cfs <br /> <br />I <br />I <br />I <br />I <br />I <br /> <br />Seepage losses from Granby are estimated by BUREC in the published Annual <br />Operation Plan (AOP). <br /> <br />Spills and releases from Granby are relatively rare in occurrence. Over <br />the period from 1974 to 1984, the spillway gates had been opened on only <br />two occasions. As such, it was assumed that the Granby release would <br />always be zero except under very specific circumstances. <br /> <br />A CBT operational model based on equation 5-1 was set up as an accounting <br /> <br />model (as a spreadsheet program on an IBM PC-XT) in which the known or <br /> <br /> <br />measured variables were used to compute the historical inflows to CBT. <br /> <br />I <br /> <br />5.3 AUGMENTATION OF HISTORIC RECORD OF CBT INFLOWS <br /> <br />I <br /> <br />An approach similar to that used in augmenting the Big Thompson River <br />virgin flows was used to augment the CBT inflow record. However, <br />correlation analyses of precipitation records versus the CBT inflows were <br />performed on an annual, rather than monthly, basis. Annual analyses were <br />preferred for two reasons: <br /> <br />I <br />I <br /> <br />1. Annual precipitation was more highly correlated to annual CBT <br />inflow than monthly precipitation to monthly inflow. <br /> <br />I <br />I <br />I <br />I <br /> <br />2. Yield from the CBT project is more directly related to annual <br />flows due to the substantial amount of reservoir storage capacity <br />in the CBT project. <br /> <br />The augmentation techniques described earlier were used to produce an <br />augmented record of CBT inflows concurrent with the augmented Big Thompson <br />River record produced in Task 2. <br /> <br />5-5 <br /> <br />I <br />