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<br />'. . <br /> <br />001898 <br /> <br />that the greatest differences among authorities arise out of the <br /> <br />potential for reduction of channel losses, the potential for <br /> <br />ground water recovery in the Yuma area, and the safe yield of <br /> <br />the Gila River system for beneficial uses. <br /> <br />Attention is also invited to the fact that Table 1 reflects <br /> <br />,...... <br />j' <br />I <br />I <br /> <br />.-"- ~. <br /> <br />no reservoir evaporation chargeable to deliveries to meet the <br /> <br />I <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />\ <br /> <br />\ <br />\ <br />~ Upper Division states. <br />\ Upper Basin release is <br />~delivery . <br /> <br />Treaty obligation. <br /> <br />A necessary incident of the flow r'egulation <br /> <br />needed to make the Upper Di~ision states Article III (d) delivery <br /> <br />is virtually all the regulation needed to make the Treaty deliveries, <br /> <br />and the associated reservoir evaporation is at the expense of the <br /> <br />Little, if any, reregulation of the <br /> <br />needed in the Lower Basin to ,make the Treaty <br /> <br />While the data of Table I indicate that an estimate of <br /> <br />10 maf annually available in the Lower Basin for beneficial con- <br /> <br />sumptive use and delivery to Mexico is conservative, it can be <br /> <br />demonstrated that even if the evaluation of the supply available <br /> <br />in the Lower Basin were to be reduced to as little as 9 maf annu- <br /> <br />ally, it still would not be necessary for the Upper Division to <br /> <br />deliver more than an average of 7.5 maf annually at Lee Ferry. <br /> <br />Assume for this discussion that the average virgin flow <br /> <br />(i.e. the flow as it would be if undepleted by beneficial consump- <br /> <br />tive use) of the Colorado River at Lee Ferry is 14 maf annually. <br /> <br />Under this assumption the Upper Division co~ld deplete the Lee <br /> <br />Ferry flow by 6.5 maf annually and still deliver an average of' <br /> <br />7.5 maf annually, or 75 maf in each period of ten years. With <br /> <br />an average delivery of 7.5 maf, only 1.5 maf annually would need <br /> <br />to be produc~d by the Lower Basin of the Colorado River system <br /> <br />to provide a total of 9 maf annually for Lower Basin beneficial <br /> <br />-9- <br />