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<br />As a conclusion, at this point of the study the safest is to assume no <br /> <br />credit from the 1975 storage decree toward the full or partial satisfaction <br /> <br /> <br />of the requirement of this contract. Any benefits of this priority that <br /> <br /> <br />will be substantial in certain years, will be limited, by design to benefit <br /> <br /> <br />the District's operation above and beyond its contractual obligations. <br /> <br />Operational analysis of the 1950's drought period <br /> <br />The foregoing studies indicated that during the drought of 1953-57 <br /> <br /> <br />storage under the 1975 priority was extremely unlikely. It appears there- <br /> <br /> <br />fore that a detailed analysis of this period could lead to a reliahle and <br /> <br /> <br />realistic definition of the most desirable annual replacement volume. <br /> <br /> <br />The analysis has assumed the existence of Chatfield Reservoir and <br /> <br /> <br />has tested various operational alternative~ by modeling the hydrologic <br /> <br /> <br />conditions of the drought period. Water stored in the reservoir from water- <br /> <br />right transfers was assumed in various amounts, its timing generally follow- <br /> <br /> <br />ing the water-yield pattern of agricultural water rights. Release from the <br /> <br /> <br />reservoir was limited to evaporation losses represented by the same data <br /> <br /> <br />that were developed in the first part of this study. Between the pool <br /> <br /> <br />content and its corresponding surface area, a mathematical relationship was <br /> <br /> <br />developed that was used in the computation of the monthly evaporation quan- <br /> <br /> <br />tities. <br /> <br />The assumed water inputs to the reservoir from various water rights to <br /> <br /> <br />be purchased for this project are shown in Table 7. <br /> <br />Table 7. Water Input Assumptions for the <br /> Operation Case Studies <br />Month A ~ .Q. D <br /> - acre-feet -,- <br />Jan.-Apr. 0 0 0 0 <br />May 500 500 500 470 <br />June 1000 1000 950 920 <br />July 800 650 600 570 <br />Aug. 700 500 450 420 <br />Sep. -Dec. ~ ~ ~ ~ <br />Totals -- 3000 2650 2500 2380 <br /> <br />- 13 - <br /> <br />M. W. BITTINGER AND ASSOCIATES, INC. <br />