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<br />-15- <br /> <br />ergy afforded by the reservoir construction in the <br />United States. In 1943 the diversions for use in <br />Mexico amounted to 1,800,000 acre-feet. <br /> <br />It is reasonable to expect that with regulated <br />~t)'elll1l f]ow~ )[exican uses will increase rather <br />than decrease. A determination of the Mexican <br />right five, ten, twenty, or more years from now <br />will in all probability require a recognition and <br />protection of an economic development in Mexico <br />based upon the use of a regulated stream flow in <br />amounts in excess of the current diversions. To <br />even the most gullible, it should be plain that there <br />is no advantage to the United States in having a <br />temporary definition of the Mexican right when <br />every probability is that for the next several decades <br />the Mexican use is bound to increase. <br /> <br />The 1906 Convention between the United States <br />and Mexico, providing for the equitable distribution <br />of the water of the upper Rio Grande, is perpetual. <br />Affected water users in the United States have a <br />full recognition of the advantage which they have <br />derived therefrom. No risk is involved in the as- <br />sertion that with the passage of time the United <br />States will derive a similar advantage from the <br />division of the waters of the Lower Rio Grande and <br />of the Colorado River in perpetuity by the pending <br />Treaty. <br /> <br />The division of the waters of the streams <br />on a perpetual basis has strong supporting <br />precedent. This is true of many interstate com- <br />pacts, as for example, the Colorado River Com- <br />pact, the La Plata River Compact, the South <br />Platte Compact, and the Republican River Com- <br />pact. These are all subject to change only by mutual <br />