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<br />Development of Estimated Daily Flows - Yampa River at Maybell <br /> <br />The daily factors applied for these adjustments were calculated as the daily percentage of <br />total volume for each year of the study period. Where the estimated historical daily depletions <br />showed a time trend, the factors from more recent periods were used over the entire study <br />period. These daily factors were then multiplied by the assumed constant 2040 level of <br />depletion (from the Phase 1 and Phase 2 studies) for each day of the year. Table 4 provides the <br />resulting approximate level of 2040 depletion by general category. <br /> <br />Table 4 <br />Approximate 2040 level Depletion Adjustments Applied to Virgin Flows (at) <br /> <br />Depletion <br />Category <br /> <br />Adjustment to <br />2040 level <br />Depletion <br /> <br />Municipal <br />Agricultural <br />Thermoelectric <br />Coal Gas Plant <br />Mining <br />Export <br />Res. Evap. and Ops. <br />Maybe" Canal <br /> <br />15.517 <br />84,588 <br />31,644 <br />8,000 <br />7,245 <br />3,402 <br />11,235 <br />10,048 <br /> <br />Total <br /> <br />171,679 <br /> <br />Estimated daily depleted Maybell flows reflective of year 2040 conditions were <br />calculated by subtracting the estimated daily depletions of from the estimated daily virgin <br />. flows. As with calculations of virgin flows, negative daily flow values were calculated in <br />several years of the study period. In these instances, any negative values were reset to zero <br />values. <br /> <br />the total 2040 depletion level adjustment averaged 171,700 acre-feet per year. This is <br />somewhat higher than the assumed 2040 levels described in the Phase I and 2 studies for <br />several reasons. First and most importantly, it should be noted that the 2040 depletion <br />estimates presented in the Phase 1 and 2 studies were for the basin above the Little Snake River <br />confluence, which is downstream of the Maybell gage; return flows from the MaybeIl Canal <br />(which accrue to the river ~ the Little Snake) would probably reduce the 171,700 acre-foot <br />average by rougWy 5,000 to 7,000 acre-feet per year. Secondly, the depletion estimates in the <br />Phase 1 and 2 studies were derived in a different manner than the depletion estimates made for <br />this analysis; for the earlier studies, all but a few depletions estimated by adding depletion <br />increments to assumptions about depletions implicit in the gage data. In the present analysis. <br />we have attempted to estimate all depletions in explicit terms from basic data. <br /> <br />11 <br />