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<br />.C) <br /> <br />~':'.J-~_. <br /> <br />... <br />Co..) <br />00 <br />CJl <br /> <br />-16- <br /> <br />CADOOA PROJECT <br /> <br />9. Operation. Problems (Cont ld) <br /> <br />upstream appropriators, but which, with respect to do~stree.m interests, <br /> <br />will consist, in part, of appropriated supplies, or flows whioh if not with- <br /> <br />held would or might have been diverted IIl1d used by ditohes dowstreS1ll in <br /> <br />Colorado and Kansasl and, in part. of unappropriated waters which. if' not <br /> <br />withheld, would or might have been unused and wasted, wholly or partially. <br /> <br />Segrer;ations of the waters impounded in the irrigation pool, if <br /> <br />attempted, would require arbitrary assumptions IIl1d large measures of esti- <br /> <br />mation, and would inevitably become souroes of local IIl1d interstate con- <br /> <br />troversy, and of possible future litigation. The accounting with respect <br /> <br /> <br />to the -nature of the impounded supplies, if attempted. would be further <br /> <br />oomplioated by unoertainties as to quantities. involving the ef'fects of <br /> <br />and proper allowanoes for, siltation and evaporation. <br /> <br />It may here be noted that the initial water storage capaoity of <br /> <br />the irrigation pool, as it is now oonstructed IIl1d as it may hereafter be <br /> <br />enlarged by the installation of flood control gates, will diminish progress- <br /> <br />ively cr intermittently by rea~on of siltation, at rates which are widely <br /> <br /> <br />variable and cannot be foreoast with accuraoy.. being dependent on the fre- <br /> <br />quenoy and magnitude of major flOOds, neitrer of whioh are prediotable. <br /> <br />Ultimately, by reaSon of si ltation. the effeotive storage oapacity of the <br /> <br />irrigation pool will be destroyed. though its useful life may be extended <br /> <br />by the oonstruction of facilities over the upstreS1ll drainage basin that <br /> <br />will oontrol tributary floods and reduoe erosicn Caused by intense rainfall <br /> <br />---and-runoff .___ <br /> <br />While the extent of such depositions of sediment may be asoertained <br />