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Similar gauging stations shall be maintained and operated below any other reservoir constructed after 1929, and at such other points as may be necessary for the securing of records required for the carrying out of the compact; and automatic water stage recorders shall be maintained and operated on each of the reservoirs mentioned, and on all others constructed after 1929. Such gauging stations shall be equipped, maintained and operated by the commission directly or in co-operation with an appropriate federal or state agency, and the equipment, method and frequency of measurement at such stations shall be such as to produce reliable records at all times. Article III The obligation of Colorado to deliver water in the Rio Grande at the Colorado -New Mexico state line, measured at or near Lobatos, in each calendar year, shall be ten thousand acre-feet less than the sum of those quantities set forth in the two following tabulations of relationship, which correspond to the quantities at the upper index stations: Discharge of Conejos River Quantities in thousands of acre-feet Conejos Index Supply (1) Conejos River at Mouths (2) 100 0 150 20 200 45 250 75 300 109 350 147 400 188 450 232 500 278 550 326 600 376 650 426 700 476 Intermediate quantities shall be computed by proportional parts. (1) Conejos index supply is the natural flow Conejos river at the U. S. G. S. gauging station near Mogote during the calendar year, plus the natural flow of Los Pinos river at the U. S. G. S. gauging station near Ortiz and the natural flow of San Antonio river at the U. S. G. S. gauging station at Ortiz, both during the months of April to October, inclusive. (2) Conejos river at mouths is the combined discharge of branches of this river at the U. S. G. S. gauging stations near Los Sauces during the calendar year.