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In , I Article II~) of the 1922 Compact wi prospective; it provided that if the United States should recognize in Mexico any right to the use of the waters of the Colorado River system, the waters would be supplied from waters over and above the aggregate of the quantities apportioned to the Upper Basin and to the Lower Basin by Article IIIla) and Article IIIlb). ~rticle III Ie) further provides that if this surplus proves insufficient, then the burden of the deficiency will be equally borne by the Upper Basin and the Lower Basin, and the states of the Upper Div~sion:will deliver at Lee Ferry water to supply one-half of , the deficiency in addition to the amount required to be delivered by the states of the Upper Division under .1\rticle III ld). It is interesting to note that the state of Arizona in its capacity as an Upper Basin state has no obligation with respect to the 1944 Mexican Treaty or the Article IIIld) delivery requirement. The information given in the attached Table I was derived from three authoritative sources. The data demonstrate that with the delivery at Lee Ferry required by Article IIIld) of the Compact, the water supply in the Lower Basin is more than adequate to supply the 8.5 maf of beneficial consumptive use apportioned to the Lower Basin hy Article III of the Compact and the 1.5 maf required for delivery to Mexico in accordance with the Mexican Treaty of 1944. Attention is invited .to the fact that according to the sources cited estimates of the water supply available in the Lower Basin for beneficial consumptive use and delivery to Mexico vary from 10.680 maf annually to 10.125 mat annually. It appears -8-