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<br />I1Et1ORAN DA <br /> <br />b <br /> <br />.-.. .1 <br /> <br />""'" <br />. <br />f'.:l <br />~ <br /> <br />(a) Hearings are contemplated upon the questions, among othersl <br />(1) from the standpoint of administration of priority rights in ,later Dis- <br />trict 67, as against appropriators upstream, at what 'stage of storage shall <br />the irrigation pool be considered empty? (2) In addition to limitations <br />on the total average annual diversions of ditches in Hater Di. strict 67, what <br />if any should be the monthly and seasonal limitations on such diversions? <br />(3) ;,"hat disposition among the ditches of Hater District 67 should be made <br />of the quantities histo!"ically di V6!"ted by, and the percents allocated to, <br />ditches that are unable to divert water at the present time? <br /> <br />(b) Until detailed reservoir ope!"ation studies are undertalren and <br />completed, certain questions cannot be answered with completeness or accur- <br />acy. Among these arel (1) water losses due to evaporation from water sur- <br />faces of the irrigation pool; (2) the quantities wasted or spilled from <br />the irrigation pool, at times of major floods and periods of large runoff, <br />by reason of inadequate (constructed or proposed) storage capaoity; (3) the <br />amounts and !"ates of depletion of storage capacity by siltation; (4) the <br />useful life of the irrigation pool, as it is now construoted and as it may <br />later be enlarged by the installation of flood cont!"ol gates; (5) the bene- <br />fits of stream flow regulation; and (6) the water conservation benefits of <br />Caddoa project under average oonditions of water production, use and disposal, <br />and during the useful life of Caddoa projeot. <br /> <br />(0) Estimates of the total flow of the Arkansa~ River at Caddoa, <br />inoluding floods, during the period 1908-1942, show an average of 319,600 <br />A.F. annually, of whioh 159,100 A.F., or substantially one-half were divert- <br />ed by the dftohes of Hater Distriot 67 in ColoradO. <br /> <br />(d) The remaining Caddoa flow (undiverted by ditohes in Water Dis- <br />triot 67) averaging 160,500 A.F. annually during the p!"e-Caddoa period, aug- <br />mented below Caddoa by tributa!"y inflows and !"etUl'n flows of a combined mag;- <br />nitude ave!"aging 118,100 A.F. annually. constituted the total State line flow <br />ante!"ing Kansas, ave!"aging 278,600 A.F. annually, ~f ~hich 106,200 A.F. pe!" <br />year. or 38%, is classified as d,i'{e!"tiblEl and usable . and 172,400 A.F., or <br />62%, is classified as undivertible and unusable, unde!" the definitions of <br />the plan of ope!"ation and administration herein defined. <br /> <br />(e) Caddoa Reservoir oannot regulate or conserve any of the tribu- <br />tary inflows or retUl'n flows entering the river downstream, nor can it fully <br />regulate or conserve all of the flows of the Arkansas River arriving at the <br />site. Approximately half of the Caddoa flow may be regulated for more bene- <br />ficial use, but cannot be oonserved for inoreased use, since that share of <br />the total must be delivered to ditohes in Water Distriot 67 to avoid inter- <br />fering with the quantities diverted by said ditohes during pre-Caddoa years. <br />Of the remaining half of the total Caddo a flow, a part thereof may also be <br />regulated for more benefioial use, but oannot be oonserved for inoreased use, <br />sinoe it must be delivered at the Stateline to avoid interfering with quan. <br />tities previously diverted by ditohes in Kansas, or the historio usable <br />Stateline flows entering Kansas. A seoond part thereof will unavoidably <br />be lost by reason of evaporation from the water surfaoe of Caddoa Reservoir; <br /> <br />(11) <br />