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<br />0019'7
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<br />shall not acquire any right by the use of the waters of the tributaries named in this subparagraph, in excess of the said
<br />350,000 acre-feet (431,721,000 cubic meters) annually, except the right to use one-third of the flow reaching the Rio Grande
<br />(Rio Bravo) from said tributaries, although such one-third may be in excess ofthat amount.
<br />(d) One-half of all other flows not otherwise allotted by this Article occurring in the main channel of the Rio Grande (Rio
<br />Bravo), including the contributions from all the unmeasured tributaries, which are those not named in this Article,
<br />between Fort Quitman and the lowest major international storage dam.
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<br />In the event of extraordinary drought or serious accident to the hydraulic systems on the measured Mexican tributaries,
<br />making it difficult for Mexico to make available the run-off of 350,000 acre-feet (431,721,000 cubic meters) annually,
<br />allotted in subparagraph (c) of paragraph B of this Article to the United States as the minimum contribution from the
<br />aforesaid Mexican tributaries, any deficiencies existing at the end of the aforesaid five-year cycle shall be made up in the
<br />following five-year cycle with water from the said measured tributaries. Whenever the conservation capacities assigned to
<br />the United States in at least two of the major international reservoirs, including the highest major reservoir, are f"illed with
<br />waters belonging to the United States, a cycle of f"IVe years shall be Considered as terminated and all debits fully paid,
<br />where upon a new five-year cycle shall commence.
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<br />Article 5
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<br />The two Governments agree to Construct jointly, through their respective Sections of the Commission, the following works
<br />in the main channel of the Rio Grande (Rio Bravo):
<br />I. The dams required for the Conservation, storage and regulation of the greatest quantity of the annual flow of the river in
<br />a way to ensure the continuance of existing nses and the development of the greatest number of feasible projects, within the
<br />limits imposed by the water allotments specified.
<br />IL The dams and other joint works required for the diversion of the flow of the Rio Grande (Rio Bravo). One of the storage
<br />dams shall be constructed in the section between Santa Helena Canyon and the mouth of the Pecos River; one in the
<br />section between Eagle Pass and Laredo, Texas (Piedras Negras and Nuevo Laredo in Mexico); and a third in the section
<br />between Laredo and Roma, Texas (Nuevo Laredo and San Pedro de Roma in Mexico). One or more ofthe stipulated dams
<br />may be omitted, and others than those enumerated may be built, in either case as may be determined by the Commission,
<br />subject to the approval of the two Governments. In planning the construction of such dams the Commission shall
<br />determine:
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<br />(a) The most feasible sites;
<br />(b) The maximum feasible reservoir capacity at each site;
<br />(c) The conservation capacity required by each country at each site, taking into consideration the amount and regimen of
<br />its allotment of water and its contemplated uses;
<br />(d) The capacity required for retention of silt;
<br />(e) The capacity required for flood control.
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<br />The conservation and silt capacities of each reservoir shall be assigned to each country in the same proportion as the
<br />capacities required by each country in such reservoir for conservation purposes. Each country shall have an undivided
<br />interest in the flood control capacity of each reservoir. The construction of the interuational storage dams shall start within
<br />two years following the approval of the respective place by the two Governments. The works shall begin with the
<br />construction of the lowest major international storage dam, but works in the upper reaches of the river may be constructed
<br />simultaneously. The lowest major international storage dam shall be completed within a period of eight years from the
<br />date ofthe entry into force of this Treaty. The construction of the dams and other joint works required for the diversion of
<br />the flows of the river shall be initiated on the dates recommended by the Commission and approved by the two
<br />Governments. The cost of construction, operation and maintenance of each of the international storage dams shall be
<br />prorated between the two Governments in proportion to the capacity allotted to each country for conservation purposes in
<br />the reservoir at such dam. The cost of construction, operation and maintenance of each of the dams and other joint works
<br />required for the diversion of the flows of the river shall be prorated between the two Governments in proportion to the
<br />benefits which the respective countries receive therefrom, as determined by the Commission and approved by the two
<br />Governments.
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<br />Article 6
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<br />The Commission shall study, investigate, and prepare plans for flood control works, where and when necessary, other than
<br />those referred to in Article 5 of this Treaty, on the Rio Grande (Rio Bravo) from Fort Quitman, Texas to the Gulf of
<br />Mexico. These works may include levees along the river, floodways and grade-control structures, and works for the
<br />canalization, rectification and artificial channeling of reaches of the river. The Commission shall report to the two
<br />Governments the works which should be built, the estimated cost thereof, the part of the works to be constructed by each
<br />Government, and the part of the works to be operated and maintained by each Section of the Commission. Each
<br />Government agrees to construct, through its Section of the Commission, such works as may be recommended by the
<br />Commission and approved by the two Governments. Each Government shall pay the costs of the works constructed by it
<br />and the costs of operation and maintenance of the part of the works assigned to it for such purpose.
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<br />Article 7
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<br />The Commission shall study, investigate and prepare plans for plants for generating hydro-electric energy which it may be
<br />feasible to construct at the international storage dams on the Rio Grande (Rio Bravo). The Commission shall report to the
<br />two Governments in a Minute the works which should be built, the estimated cost thereof, and the part of the works to be
<br />constructed by each Government. Each Government agrees to construct, through its Section of the Commission, such
<br />works as may be recommended by the Commission and approved by the two Governments. Both Governments, through
<br />their respective Sections of the Commission, shall operate and maintain jointly such hydro-electric plants. Each
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