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<br />n "',"'\ r" ~ <) <br />L' ,~,j t~ J -'- ~~ <br /> <br />. <br /> <br />I. <br /> <br />. <br /> <br />E. <br /> <br />Irrigated areas in Reach 2 <br /> <br />Since irrigated areas in Reach 2 are located near the stream channel, <br />monthly stream depletion was estimated to be approximately <br />equivalent to the monthly consumptive use values. The flow <br />requirement at the upstream end of Reach 2 was estimated to be <br />equal to the sum of the monthly diversion requirements for the Harris <br />Patterson, Pioneer, and McClure - MUlTay ditches as shown in Tables <br />14 through 16, respectively. <br /> <br />Irrigated Areas in the Salt Creek basin <br /> <br />Stream depletions associated with irrigation in the Salt Creek basin <br />are reflected in the Salt Creek gage records. Therefore, no <br />calculations were made to estimate irrigation depletions and return <br />flows. The virgin flow of Salt Creek was calculated through use <br />of runoff-elevation calculations as described above. <br /> <br />F. <br /> <br />G. Irrigated Areas in Reach 1 <br /> <br />Since irrigated areas in Reach 1 are located near the stream channel, <br />monthly stream depletion was estimated to be approximately <br />equivalent to the monthly consumptive use values. <br /> <br />VII. <br /> <br />Reservoir Evaporation <br /> <br />Net reservoir evaporation from Lemon Reservoir is equivalent to the <br />water surface evaporation less the evapotranspiration that occUlTed from <br />natural vegetation prior to development of the site. Gross evaporation <br />was calculated by the Blaney Criddle method, calibrated through use of <br />Cherry Creek Reservoir and Fort Collins pan evaporation data. Vallecito <br />Reservoir temperature and precipitation data were used. Effective <br />precipitation for natural vegetation evapotranspiration was estimated <br />through use of the modified Blaney-Criddle method. Water surface area <br />was calculated on the basis of the reservoir area-capacity curve data. <br />Historic reservoir monthly storage, surface area, and estimated net <br />evaporation are presented in Tables 17 through 19, respectively. <br /> <br />VIII. Model Calibration <br /> <br />The model was calibrated by comparing the computer generated historic <br />flow values with flow records for the gage near the Florida Farmers Ditch <br />and the Bondad gage. Calibration was also required to ensure that there <br />was adequate flow to meet irrigation diversion requirements in the upstream <br />portion of Reach 2. Adjustments were made in the runoff estimates for <br />ungaged areas. <br /> <br />Minor adjustments were made in the historic release records for Lemon <br />Reservoir for the period of 1968 through 1980 to provide a better match <br />between the historical and simulated flows at the gage near the Florida <br />