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'"":) r -~ ~ c8_~ _ _____ ___________ "'- - ':;1 or greater assumed releases from stornge, vnll have the effect of reducing losses of water from the reservoir by evaporation and spill (a result which is evident and admitted), and vrill thereby increase the "amou"'ts of usable water," - a conclusion questioned by Colorado depending on wh~t is meant by "usable water." On the other hand, the ~raphs and other tS:~lUlations Bubmit- ted by Kansas tend to show that greater assumed relee,ses from storaze are also accompanied by smaller average volumas of water in storage, and by per- iods of greater frequency and longer duration when the reservoir 'viII be empty. This means that the assumed greater releases from storage must be made during shorter periods of time, and that any release in exoess of essen- tial irrigation requirerrwnts at the time, even though such excess release be at divertible rates, may in f'aot be wasted and lost t~ough non-use. Ele- ments of time as well as volume are neoessarily involved in such water supply and irrigation requirment considerations, and estimates of losses of water should inolude totals fram both river and reservoir. -7- re, 18. As shawn by available streamflow records at the State line and Garden City, relatively large volumes of divertible strearnflows (and of so-called "usable water" as here calculated by Kansas) were wasted and lost through non- use for the reason that, at the intermittent ti~~s of their occurrence, their volumes were in excess of essential irrigation requirements at the time. Plans for operating the irrigation pool in Caddoa Reservoir should not be;based on arbitrarily assumed releases from storage, but should recognize, ,among other things, that water supplies at and below Caddoa are related to each other, are parts of the waters of the intsrstate stream, and are not unlimited in amount; and that reservoir operations, to regulate Caddoa flows heretotore di- verted and used in Colorado and Kansas, and to conserve Caddoa flovm hereto- fore unused and wasted by Garden City, should oontemplate releases from stor- age to supplement the supplies divsrted from unregulated streamflows and re- ceived fram natural precipitation. '--- 19. From river and reservoir oper~tion studies previously made by Colo- rado it appears tl--8.t "demands on the reservoir" asslJ.'lIed by Kansas in Studies 3 and 4 ,were arbitrary and excessive, with the result that the calculated greater' "amounts of usable water," and of so-called "new water" estimated therefrom, are misleading. The reported results of Study 2, after correction for "Caddo a flmvs heretofor's used in Kansas," indicate an avernge annual quan- tity'of so-called "new water" that appears to be consistent with the quantity of so-called "surplus" calculated by Colorado for the same period used by Kansas, when the tvlO results are adjusted to the same basis for ths amcunts of water heretofore used in Water District 67 and in Kansas. ;.- 20. Both the "new water" and "surplus" quantities above mentioned were calculated, and reported as averages, for a study period representing what may be termed the first-half of the useful life of Caddoa Reservoir irrigation pool, during which the effective storage capacity, progressively diminished by siltation, averaged about 300,000 acre feet. Similar studies covering the second-half of the useful life of the irrigation pool, if made, would involve an effective storage oapacity aver.~ing about 100,000 acre feet, or one-third that assumed for the studies under discussion, and probably would disclose oorrespondingly smallsI' quantities of "new" or "surplus" wntsr. \ihen the '-