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<br />23 <br /> <br />~:::.:.~:,. <br /> <br />':') <br />o <br />~ <br />(";_1 <br />~ <br />c:.u <br /> <br />Purgatoire Rivers and precipitation. Daily outflow <br /> <br />terms were reieases and lake evaporation. Average <br /> <br />values that were estimated in the described manner are <br /> <br />shown in table 5. No trend was apparent SO the overall <br /> <br />average for the period, 31.6 cfs, was used in the <br /> <br />reservoir operation model. <br /> <br />In the water budgets of both the model and the <br /> <br />unmeasured inflow determination the precipitation and <br /> <br />evaporation terms were computed from the surface area of <br /> <br />the average conservation storage, which was obtained <br /> <br />from the January 1, 1969 area-capacity table and the <br /> <br />published USWB data. Lake evaporation was assumed to <br /> <br />be seven-tenths of the pan evaporation. The model used <br /> <br />a trial and error technique to determine the amounts of <br /> <br />lake evaporation minus precipitation. A linear regres- <br /> <br />sion of monthly averages of observed pan evaporation <br /> <br />values with average monthly values that were computed <br /> <br />from the mass transfer equation reported by Kohler, <br /> <br />Nordenson, and Fox8 was performed so that values of pan <br /> <br />evaporation for periods with missing data could be com- <br /> <br />puted using the mass transfer equation and regression <br /> <br />equations. Considerable effort was spent trying to <br />