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<br />l <br /> <br />waste waters originating in the United States. Thus it was the <br />intent of the negotiators that all return flows and waste waters <br />would receive credit in determining the annual delivery of <br />1,500,000 acre-feet. <br /> <br />It is also significant to note that the last paragraph <br />of Article 10 provides an escape clause wherein any extraordinary <br />droughtor serious accident to the irrigation system in the United <br />states, making it difficult to deliver the guaranteed quantity of <br />water to Mexico, the water allotted will be reduced in the same <br />proportion as consumptive uses in the United States are reduced. <br />It appears under the wording of this "escape clause" neither the <br />extraordinary drought nor the consequent reduction of consumptive <br />uses need be felt simultaneously in all parts of the Colorado <br />River Basin in the United States in order for the clause to be <br />invoked. It is sufficient if there be such a drought in any por- <br />tion of the Basin requiring a reduction of consumptive use any- <br />where in the Basin in the united States. What is an "extraordi- <br />nary drought" is not defined within the article and considerable <br />testimony as to its meaning was rendered during the Senate hear- <br />ings. <br /> <br />Article 11 <br /> <br />This article provides that the waters allotted to Mexico <br />by Article 10 shall be made up of the waters of the Colorado River <br />"whatever their origin", and shall be delivered to Mexico in the <br />boundary portion of the Colorado River, except that until 1980 <br />Mexico may receive 500,000 acre-feet annually and after that year <br />375,000 acre-feet annually, through the All-American Canal, as <br />part of the guaranteed quantity. If the Mexican diversion dam is <br />located entirely in Mexico, which it is, the United States under- <br />takes to deliver, at Mexico's request, up to 25,000 acre-feet <br />annually out of the allocation at the Sonora land boundary near <br />San Luis. This latter quantity of water is made up of waste and <br />return flows from the Yuma project. <br /> <br />It is significant to note that the All-American Canal <br />was built and is operated by the Bureau of Reclamation. The <br />deliveries of water through the All-American Canal was suggested <br />by the Committee of Fourteen and Sixteen in its Santa Fe meeting. <br />Provision was made in the construction capacity of the All-American <br />Canal down to pilot Knob for the use of the canal to carry a maxi- <br />mum of 3,000 c.f.s. of water in excess of the needs of the United <br />States. The approval of the Bureau of Reclamation was obtained <br />on the deliveries of Mexican water through this canal. <br /> <br />-8- <br />