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<br /> <br />Reservoir Yield <br /> <br />Only the yield available in a drought occurring once in a 50- <br />year period (two percent yield) was considered as a dependable <br />yield for Kansas reservoirso The use of this definition of <br />dependable yields was recommended by the Scientific Committee on <br />Water Supply and Demand during the preparation of the 1984 Water <br />Supply and Demand Report and was utilized again in this report <br />for the purpose of consistencyo <br /> <br />One of the limitations of this report is that reservoir yields <br />have been held constant throughout the 1984-2040 planning period. <br />It is anticipated that there will be a significant decline in <br />yields due to an excessive sediment accumulation at Fall River, <br />John Redmond, Perry, Toronto and Tuttle Creek reservoirs during <br />the planning period and to a lesser extent sediment accumulation <br />is anticipated at several other reservoirso It is also <br />anticipated that depleted inflows may occur at Milford Reservoir <br />during the planning period and significantly reduce Milford's <br />yieldo The current and projected reservoir yields. shown in this <br />report, should be revised when the studies being conducted by the <br />Corps of Engineers are completed 0 <br /> <br />Table 6 shows the estimated dependable reservoir yields by river <br />basin and reservoir for 19840 The Kansas City and Tulsa Corps of <br />Engineers are in the process of preparing revised reservoir <br />yields for the Kansas Water Office; however, most of these new <br />figures are not yet availableo Consequently the Kansas Water <br />Office utilized a number of different sources to obtain the <br />reservoir yield estimates shown in Table 60 <br /> <br />The Kansas Water Office prepared the reservoir estimates in Table <br />6 that pertain to footnote "a"o The methodology used to derive <br />these estimates is described as followso Estimates of monthly <br />inflows and net evaporation at the various reservoirs were <br />analyzed from UoSo Geological Surveyor Corps of Engineers <br />records 0 Current (1985) storage - area data were obtained from <br />the Corps of Engineers 0 A computer program was wri tten to <br />compute a draft rate (yield) which would result in the reservoir <br />going dry once during the 1952 - 1957 drought periodo The <br />inflows for the period were then routed through the reservoirs to <br />estimate the current yieldo <br /> <br />In the case of Milford and Tuttle Creek, the historic inflows <br />were modified to reflect upstream depletions from Nebraska <br />activities, conservation practices and irrigation withdrawalso <br /> <br />24 <br />