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001899 / consumptive uses and delivery to Mexi~o. Thus, the total available for beneficial consumptive use in the seven Colorado River states and for delivery to Mexico would be 15.5 maf annually (6.5 +' 9.0 == 15.5). Article III (c) of the compact provides that waters to be delivered to Mexico shall be supplied first from the waters which are surplus over and above the aggregate of 16 maf apportioned by paragraphs (a) and, (b). In the example given the surplus would be a negative quantity: - 0.5 maf (15.5 - 16 = -0.5). Article III (c) provides further that if the surplus shall prove insufficient for the delivery to Mexico, then the burden of the deficiency shall be borne equally by the Upper Basin and the Lower Basin, and whenever necessary the states of the Upper Division shall deliver at Lee Ferry water to supply one-half of the deficiency in addition to the Lee Ferry delivery required by paragraph, Cd). The deficiency is equal, to the Treaty obligation of 1.5 maf annually less the surplus; in the example given the deficiency would amount to 2 maf annually (1.5 - (-0.5) = 2.0). with this deficiency borne equally, the Upper Basin would be entitled to use only 6.5 maf of the 7.5 maf apportioned to it by Article III (a) and the Lower Basin would be entitled to use only 7.5 maf of the 8.5 maf apportioned to it by Article III (a) and (b). Of the 9 maf available in the Lower Basin from the Lee Ferry delivery and the production of Lower Basin tributaries there would remain 1.5 maf for delivery to Mexico; it would not be neces- sary for the Upper Basin to meet any part of the Treaty obliga- tion by deliveries in excess_of 7~5: maf annually at Lee Perry. This proposition can be stated more succinctly. The -10-