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<br />. <br /> <br />bear such a deficiency? One possibility would be to proration the deficiency <br /> <br />. <br /> <br />..&:>. evenly between the Upper and Lower Basins. Another approach would be <br />o <br />-.I. to require one of the basins to assume all or a disproportionate share of <br /><0 <br /> <br />the deficiency. The latter approach was adopted by the Bureau of Recla- <br /> <br />. <br /> <br />mation in its planning, but not with the concurrence of the Upper Basin <br /> <br />. <br /> <br />States. The issue may ultirrately be decided in the courts. <br /> <br />. <br /> <br />The Lower Basin waa assured that depletions in the Upper Basin <br /> <br />would not prevent at least 75 m. a. f. of aggregate flow per ten-year period <br /> <br />from reaching the Lower Basin at Lee Ferry. l2 The Lower Basin received <br /> <br />. <br /> <br />a guaranteed ten-year, not annual, 13 rpinimum flow. The Upper Basin <br /> <br />became a guarantor in the sense that its depletions may not reduce the <br /> <br />ten-year aggregate flow below the 75 m. a. f. figure. <br /> <br />. <br /> <br />The 1922 Compact apportionment formula does not apply to those <br /> <br />groundwater resources within the basin which are hydrologically unrelated <br /> <br />. <br /> <br />to the Colorado River System. <br /> <br />Operating Criteria Under 1968 Colorado River Basin Act. The <br /> <br />apportionment of the variable river flow between the Upper and Lower <br /> <br />. <br /> <br />Basins became a challenge in the 1960's, particularly with the construc- <br /> <br />tion and filling of new storage reservoirs in the Upper Basin.14 . In the <br /> <br />Colorado River Basin Act of 1965l5 Congress instructed the Secretary <br /> <br />. <br /> <br />of the Interior to develop and adopt "criteria for the coordinated long- <br /> <br />range operation" of the Federal reservoirs in the Colorado River System.16 <br /> <br />. <br /> <br />Congress specified the priorities by which. water was to be released from <br /> <br />Lake Powell am ve the Lee Ferry accounting point. The tre aty obligation <br /> <br />. <br /> <br />4 <br />