| OCR Text |
Show B. WATER SUPPLY As provided in Article III (f) of the Compact, further equitable apportionment of the unapportioned water of the Colorado River will be made after October 1, I963. The unallocated water is computed as 220,000 acre-feet a year. It is assumed that one-fourth of the unapportioned water or 55,000 acre-feet will be made available to Arizona. On the basis of these assumptions, Arizona's share of the Colorado River annually under ultimate conditions is summarized as follows: Acre-feet Water from Article III (a) and (b) 3,800,000 Less uses by New Mexico and Utah in Lower Basin 130,000 Net water available from Article III (a) and (b) 3,670,000 One-fourth share of unallocated water 551000 Total available for Arizona 3,725,000 (d) Water for use by the Central Arizona Pro.-ject. Not all of the 3,725,000 acre-feet of water claimed by Arizona as its annual share of the flows of the Colorado River system would be available to the Central Arizona Project. Depletions due to main-stem reservoir evaporation, present irrigation uses, and potential irrigation uses not a part of the Central Arizona Project, all must be deducted in order to determine the water actually available to the Central Arizona Project from the Colorado River. (i.) Evaporative losses. As developed in the section on losses, it is estimated that under ultimate conditions, approximately 900,000 acre-feet of water will be lost annually to evaporation from the surfaces of reservoirs within the Lower Basin on or benefiting main-stream developments. This amount is in addition to the quantities lost from the same areas prior to the construction of any dams. Inasmuch as these losses represent a depletion of the water supply of the Lower Easin as a whole, it has been assumed that these losses would be apportioned among the various states of the Lower Basin on an equitable basis. It is the contention of Arizona that a just method of apportionment would be to charge California, Nevada, and Arizona with these main-stream reservoir losses in the ratio that these states receive water from the Colorado River. On this basis, with main-stream reservoir losses of 900,000 acre-feet, Arizona would be charged with 313,000 acre-feet a year. B-65 |
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Original book: [State of Arizona, complainant v. State of California, Palo Verde Irrigation District, Coachella Valley County Water District, Metropolitan Water District of Southern California, City of Los Angeles, California, City of San Diego, California, and County of San Diego, California, defendants, United States of America, State of Nevada, State of New Mexico, State of Utah, interveners] : |
