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<br />, <br /> <br />. <br /> <br />.' <br /> <br />. <br /> <br />IL, <br />I'" <br />:r=~ <br />. <br /> <br />001913 <br /> <br />10:, <br /> <br />basis of an idealized section representing the stream cross <br />section. This is adjusted in width and depth until it conforme, <br />near17, to available data supplied by maps and to hydraulic <br />requirements. Estimates of surface storage are then made on <br />the basis of the idealized section. <br /> <br />The seasonal fluotuation of return flow is estimated by use <br />of ths methods described in reference (7) . The actual pattern <br />of return flow accumulation. here assumed to follow closely the <br />pattern of consumptive use, is replaced by a displaced cosine <br />curve whioh becomes the basis of the charts of figures 5 and ~ . <br />}:t is tac.itlY_assUlaed_he:r.:.e_1;l1a:LaPP lie ati on~_ o~J:.r]:"iga t !0!L water <br />must be made to meet the requirements of the,growinR crop so <br />that applications would also follow essentially the pattern of the <br />consumptive use. Some comparisons of plots are made on figure 3 <br />80 that some judgmpnt of its reasonableness can be formed. Use <br />of this procedure requires that irrigation must have been <br />practiced long enough to establish a regimen. Since irrigation <br />has been practiced in the South Platte valley for over a century <br />it may be assumed that this requirement has been met. Pumping <br />1s acoounted for indirectly in the figures for the irrigated area. <br /> <br />ResU:1"tii -obtainecf,,, <br /> <br />The results obtained are shown on two figures. On figure Z <br />is shown~compQrison of the observed flow at Julesburg with an <br />estimate of the Julesburg flow based upon surfaoe flows only. <br />In specific terms, the formula used is : <br /> <br />Flow at Julesburg = Flow at Kersey - Diversions. <br /> <br />It will be noted that this approach is hopeless since no agree- <br />ments are obtained which are close enough to serve any usefUl <br />purpose. The correlation obtained when ground water flows are <br />included is shown on ,tigure I . It will be noted that the <br />discrepancies shown on: the previous chart have been essentially <br />removed by including the ground water flows due to reservoir <br />leakage, return flows due to irrigation and the seasonal <br />fluctuation. The oontribution of precipitation is alao included. FJ9~ <br /> <br />Conclusions <br /> <br />The following conclusions can be made: <br /> <br />(1) Correlation of the Kersey and Juleaburg flows of the South <br />Platte river can be effectively made if the effect of ground- <br />water storage and return ia included in the oomputation. <br /> <br />(2) Ground water contributions can be evaluated with about the <br />same aocuracy as surface water contributions if estimates of <br />the ground water~ows are based upon water quantities and the <br />hydraulio and geometr1cal properties of the aquifer. <br /> <br />. (:3)", In th.e Kers~y-Jul.e8burgreach of the South 1'1atte valley <br />,-:""~~"'",lJl1P'g~ .Mifft,~:'f;J:!p~t.~,1t':VJl;;..~O..t....P.Il"'WA-te~,. . _. _ <br />~"''" :npplj. ".~~t;Qlic- 'c) " Jii.--ue;"iD.dl~a\e'i'~i~:; 'bIYl'iv.iirb.""\h.~ ~ <br />oase. !he per:f"ormance,f"'f the stream oonfirms it. <br /> <br />n <br />