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<br />0019~9
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<br />(Rio Bravo) shall be borne equally by the two Governments. The operation and maintenance of all gaging stations or the
<br />cost of such operation and maintenance shall be apportioned between the two Sections in accordance with determinations
<br />to be made by the Commission.
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<br />III - Colorado River
<br />
<br />Article 10
<br />
<br />Of the waters of the Colorado River, from any and all sources, there are allotted to Mexico:
<br />
<br />(a) A guaranteed annual quantity of 1,500,000 acre-feet (1,850,234,000 cubic meters) to be delivered in accordance with
<br />the provisions of Article 15 ofthis Treaty.
<br />(b) Any other quantities arriving at the Mexican points of diversion, with the understanding that in any year in which, as
<br />determined by the United States Section, there exists a surplus of waters of the Colorado River in excess of the amount
<br />necessary to supply uses in the United States and the guaranteed quantity of 1,500,000 acre-feet (1,850,234,000 cubic
<br />meters) annually to Mexico, the United States undertakes to deliver to Mexico, in the manner set out in Article 15 of this
<br />Treaty, additional waters ofthe Colorado River system to provide a total quantity not to exceed 1,700,000 acre-feet
<br />(2,096,931,000 cubic meters) a year. Mexico shall acquire no right beyond that provided by this subparagraph by the use of
<br />the waters of the Colorado River system, for any purpose whatsoever, in excess of 1,500,000 acre-feet (1,850,234,000 cubic
<br />meters) annually.
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<br />In the event of extraordinary drought or serious accident to the irrigation system in the United States, thereby making it
<br />difficult for the United States to deliver the guaranteed quantity of 1,500,000 acre-feet (1,850,234,000 cubic meters) a year,
<br />the water allotted to Mexico under subparagraph (a) ofthis Article will be reduced in the same proportion as consumptive
<br />uses in the United States are reduced.
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<br />Article 11
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<br />(a) The United States sball deliver aU waters allotted to Mexico wherever these waters may arrive in the bed ofthe
<br />Iimitrophe section of the Colorado River with the exceptions hereinafter provided. Such waters shall be made up of the
<br />waters of the said river. whatever their origin, subject to the provisions of the following paragraphs of this Article.
<br />(b) Of the waters ofthe Colorado River allotted to Mexico by subparagraph (a) of Article 10 of this Treaty, the United
<br />States shall deliver, wherever such waters may arrive in the limitrophe section of the river, 1,000,000 acre-feet
<br />(1,233,489,000 cubic meters) annuaUy from the time the Davis dam and resenroir are placed in operation until January 1,
<br />1980 and thereafter 1,125,000 acre-feet (1,387,675,000 cubic meters) annually, except that, should the main diversion
<br />structure referred to in subparagraph (a) of Article 12 of this Treaty be located entirely in Mexico and should Mexico so
<br />request, the United States shall deliver a quantity of water not exceeding 25,000 acre-feet (30,837,000 cubic meters)
<br />annuaUy, unless a larger quantity may be mutually agreed upon, at a point, to be likewise mutually agreed upon, on the
<br />international land boundary near San Luis, Sonora, in which event the quantities of 1,000,000 acre-feet (1,233,489,000
<br />cubic meters) and 1,125,000 acre-feet (1,387,675,000 cubic meters) provided herein above as deliverable in the limitrophe
<br />section ofthe river shall be reduced by the quantities to be delivered in the year concerned near San Luis, Sonora.
<br />(c) During the period from the time the Davis dam and resenroir are placed in operation until January 1, 1980, the United
<br />States shaU also deliver to Mexico annuaUy, ofthe water allotted to it, 500,000 acre-feet (616,745,000 cubic meters), and
<br />thereafter the United States shall deliver annually 375,000 acre-feet (462,558,000 cubic meters), at the international
<br />boundary line, by means ofthe AJI-American Canal and a canal connecting the lower end of the Pilot Knob Wasteway with
<br />the Alamo Canal or with any other Mexican canal which may be substituted for the Alamo Canal. In either event the
<br />deliveries shall be made at an operating water surface elevation not higher than that of the Alamo Canal at the point where
<br />it crossed the international boundary line in the year 1943.
<br />(d) All the deliveries of water specified above shall be made subject to the provisions of Article 15 of this Treaty.
<br />
<br />Article 12
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<br />The two Governments agree to construct the following works:
<br />
<br />(a) Mexico shall construct at its expense, within a period of five years from the date of the entry into force of this Treaty, a
<br />main diversion structure below the point where the northernmost part of the international land boundary line intersects
<br />the Colorado River. If such diversion structure is located in the Iimitrophe section of the river, its location, design and
<br />construction shall be subject to the approval of the Commission. The Commission shall thereafter maintain and operate
<br />the structure at the expense of Mexico. Regardless of where such diversion structure is located, there shall simultaneously
<br />be constructed such levees, interior drainage facilities and other works, or improvements to existing works, as in the
<br />opinion of the Commission shall be necessary to protect lands within the United States against damage from such floods
<br />and seepage as might result from the construction, operation and maintenance of this diversion structure. These protective
<br />works shall be constructed operated and maintained at the expense of Mexico by the respective Sections of the
<br />Commission, or under their supervision, each within the territory of its own country.
<br />(b) The United States, within a period of five years from the date ofthe entry into force of this Treaty, shall construct in its
<br />own territory and at its expense, and thereafter operate and maintain at its expense, the Davis storage dam and resenroir,
<br />a part of the capacity of which shall be used to make possible the regulation at the boundary of the waters to be delivered
<br />to Mexico in accordance with the provisions of Article 15 of this Treaty.
<br />(c) The United States shall construct or acquire in its own territory the works that may be necessary to convey a part ofthe
<br />waters of the Colorado River allotted to Mexico to the Mexican diversion points on the international land boundary line
<br />referred to in this Treaty. Among these works shall be included: the canal and other works necessary to convey water from
<br />the lower end of the Pilot Knob Wasteway to the international boundary, and, should Mexico request it, a canal to connect
<br />the main diversion structure referred to in subparagraph (a) of this Article, if this diversion structure should be built in the
<br />limitrophe section of the river, with the Mexican system of canals at a point to be agreed upon by the Commission on the
<br />international land boundary near San Luis, Sonora. Such works shall be constructed or acquired and operated and
<br />maintained by the United States Section at the expense of Mexico. Mexico shall also pay the costs of any sites or rights of
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