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<br />joool. <br />~ <br />I') <br />~ <br /> <br />and a third part cannot be regulated or conserved, but, at times of major <br />floods and during periods of large runoff, will inevitably spill from the <br />irrigation pool. As storage capacities decline with progressive siltation, <br />such spills will increa3e in frequency and amount. Henoe, the conservation <br />benefits of Caddo a project wi 11 decline with age, and ultimately, when the <br />irrigation pool has been filled with sediment, both the regulation and con- <br />servation benefits wi'l disappear, and streamflow conditions will revert to <br />those whioh prevailed prior to Caddoa, unless replaoement storage capacity <br />of equal effectivene ss be constructed upstream. <br /> <br />':::0 <br /> <br />. . <br />., <br /> <br />(f) During its useful life, Caddoa Reservoir will decrease the <br />total State line flows entering Kansas, and will deorease the undivertible <br />and unusable flows crossing the Stateline, but will increase the supplies <br />divertible and usable by constructed ditches in Kansas, under the plan of <br />operation and administration herein defined. The said increase in usable <br />Stateline flows will be in proportion to the increase in diversions made <br />by all ditches in Water Districts 14, 17 and 67 in Colorado. <br /> <br />(g) In addition to the proportionately increased supplies usable <br />in Kansas, the said plan of operation and administration will refleot bene- <br />fits into Kansas, for the reason that the Ka~sas credits, caloulated as a <br />fixed percent of the diversions in ColoradO, will not fluctuate as vridely, <br />nor decline as 101; in drouth seasons, as the historically recorded usable <br />state line flows. This equalization effect results from the faots. (1) <br />that Colorado diversions include, in addition to currently produced stream- <br />flows, the rediversions of return flows, and the diversions during low flow <br />conditions of drouth seasons of supplies previously stored in upstream moun- <br />tain reservoirs; and (2) the ColoradO diversions consist largely of mountain <br />runoff and do not fluctuate as widely as the plains runoff, which is the <br />principal source of the state line flows. For example, during the period 1900- <br />1942, the Kansas credits, calculated at 12.4% of the Colorado diversions, <br />exceeded the historically recorded usable State line flows in 13 of the 16 <br />years (when the said usable State line flows were sub-average) bo' average of <br />27,700 A.F. per year. Sue h additions to the supp lies usable in lCansas at <br />times when needs are greatest and supplies least, constitute a substantial <br />benefit not reflected in overall average figures. <br /> <br />(h) The provisions of the said plan of operation and administra- <br />tion that, during periods of irrigation pool releases. the usable State line <br />flows need not exceed two-thirds nor be permitted to fall below one-third <br />of the combined diversions in Hater District 67, are neoessary in order to <br />prevent Colorado from claiming all the impounded water at times following <br />periods of over-deliveries to Kansas, and to prevent Kansas from claim- <br />ing all the impounded water at times following periods of under-deliveries <br />to Kansas~ and to permit of maintaining the interstate relations by making <br />up the under and aver-deliveries to Kansas gradually, rather than suddenly. <br /> <br />(i) During the 6 SUl1l1ler months of 1943 the total Stateline flow <br />entering Kansas, except for Caddoa Reservoir, would have amounted to 26.900 <br />A.F. Actually; with Caddoa Reservoir operating (under the plan of the 1933 <br />Stipulation), the total Stateline flow, all usable in Kansas, was 59.500 <br />A.F. tleasured in that way Kansas rooei ved 32,600 A.F. of v....ter which, in <br />the absence of Caddoa Reservoir, would not have crossed the Stateline. - an <br /> <br />(12) <br />