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<br /> <br /> <br />operation represents the lower limit that will still keep the pool content <br /> <br /> <br />above 20,000 acre-feet at all times. It is interesting to note that the <br /> <br /> <br />evaporation loss became reduced to 3,019 acre-feet on the average (by 5.4 <br /> <br /> <br />.percent) due to the reservoir being operated at a lower level. The pool <br /> <br /> <br />content reduction during the period of the study is less than 100 acre-feet. <br /> <br />Case study 3 is base~ upon the contract allowing the reduction of the <br /> <br /> <br />pool content below the 20,000 acre-feet provided that by the end of the year <br /> <br /> <br />that level is reestablished. With the assumed filling schedule these 10w- <br /> <br /> <br />pool conditions are limited to the first half of the calendar years. Curve <br /> <br /> <br />number 3 shows that this physical point is reached at December 31, 1956, <br /> <br /> <br />with a pool content of 20,316 acre-feet. <br /> <br />In this similation run it is interesting to note that the average <br /> <br /> <br />annual evaporation became 2,993 acre-feet which is less than the annual <br /> <br /> <br />input of 3,000 acre-feet. Consequently there is more water in the pool of <br /> <br /> <br />the reservoir at the end of the 5-year drought than there was at the begin- <br /> <br /> <br />ning of the period. Such a condition indicates an overcompensation to a <br /> <br /> <br />degree that cannot be economically justified. To test a less stringent <br /> <br /> <br />replacement policy, additional operational alternatives were tested as <br /> <br />shown on Figure 2 with the results summarized in Table 9. The volume of' <br /> <br /> <br />the annual refill input has been gradually lm.,ered in these cases. The <br /> <br /> <br />initial pool content was kept the same throughout the three case studies <br /> <br /> <br />to allow an easier graphical comparison. <br /> <br />Table 9. Result Summary for Case Studies 1 through 3 of Figure 2 <br /> <br /> <br /> Operational Alternative <br />Characteristic (1) (2) (3) <br />Refill schedule B C D <br /> acre feet <br />Initial content 23,600 23,600 23 , 600 <br />Final content 21,123 20,511 20,122 <br />Maximum content 24,028 23,965 23,906 <br />Minimum content 20,802 20,303 19,905 <br />Content range 3,226 3,662 4,001 <br />E 1953 3,327 3,318 3,311 <br />V 1954 3,649 3,628 3,610 <br />1955 2,705 2,679 2,658 <br />A 1956 3,496 3,454 3,420 <br />p 1957 2.549 2.510 2.479 <br /> Total 15,727 15,589 15,478 <br /> _ 17 _ -- <br />