PUBLIC LAWS-CH. 155-MAY 31, 1939 (j) "Accrued Credits" are the amounts by which the sum of all annual credits exceeds the sum of all annual debits over any common period of time. (k) "Project Storage" is the combined capacity of Elephant Butte Reservoir and all other reservoirs actually available for the storage of usable water below Elephant Butte and above the first diversion to lands of the Rio Grande Project, but not more than a total of 2,638,860 acre-feet. (1) "Usable Water" is all water, exclusive of credit water, which is in project storage and which is available for release in accordance with irrigation demands, including deliveries to Mexico. (m) "Credit Water" is that amount of water in project storage which is equal to the accrued credit of Colorado, or New Mexico, or both. (n) "Unfilled Capacity" is the difference between the total physical capacity of project storage and the amount of usable water then in storage. (o) "Actual Release" is the amount of usable water released in any calendar year from the lowest reservoir comprising project storage. (p) "Actual Spill" is all water which is actually spilled from Elephant Butte Reservoir, or is released therefrom for flood control, in excess of the current demand on project storage and which does not become usable water by storage in another reservoir; provided, that actual spill of usable water cannot occur until all credit water shall have been spilled. (q) "Hypothetical Spill" is the time in any year at which usable water would have spilled from project storage if 790,000 acre-feet had been released therefrom at rates proportional to the actual release in every year from the starting date to the end of the year in which hypothetical spill occurs; in computing hypothetical spill the initial condition shall be the amount of usable water in project storage at the beginning of the calendar year following the effective date of this Compact, and thereafter the initial condition shall be the amount of usable water in project storage at the beginning of the calendar year following each actual spill. ARTICLE II. The Commission shall cause to be maintained and operated a stream gaging station equipped with an automatic water stage recorder at each of the following points, to-wit: (a) On the Rio Grande near Del Norte above the principal points of diversion to the San Luis Valley; (b) On the Conejos River near Mogote; c) On the Los Pinos River near Ortiz; d) On the San Antonio River at Ortiz; e) On the Conejos River at its mouths near Los Sauces; (f) On the Rio Grande near Lobatos; (g) On the Rio Chama below El Vado Reservoir; (h) On the Rio Grande at Otowi Bridge near San Ildefonso; (i) On the Rio Grande near San Acacia; (j) On the Rio Grande at San Marcial; (k) On the Rio Grande below Elephant Butte Reservoir; (1) On the Rio Grande below Caballo Reservoir. Similar gaging 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. 786 [53 STAT.
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