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C ' C A <br />OLORADO S OMPACT PPORTIONMENT <br /> <br />Upper Basin s hare of Colorado River = X (6 maf to 9 maf) <br />X - 50 ,000 af for Arizona = Y <br />Colorado apportioned 51.75 % of Y ( but is also responsible for its share of reservoir evaporation ) . <br /> <br />The following calculation is a way of viewing how the 10 - year running average 75 million acre - <br />feet non - depletion requirement might t ranslate into water available for consumptive use by the <br />U pper B asin S tates in an average water year, based on river gauge data for the period from 1896 <br />to 2003: <br />Acre - feet per year Provisions <br />Total average annual water production in the Upper Colorado <br /> 14,800,000* <br />River Basin <br />Or the amount to be delivered to the Lower Basin under the <br /> Minus 7,500,000 <br />current 10 - year running average <br /> Minus 750,000 Mexican Treaty obligations (a disputed point) <br /> Minus 50,000 For portion of Arizona in the U pper B asin (above Lee Ferry) <br /> = 6,500,000 Total Annual Average Available to Upper Basin <br />* Long - term average 1896 - 2003, Upper Colorado River Comm’n 55 Annual Rpt. (2003) (note <br />that tree - ring studies estimate that this average is probably high given the long - term histo rical <br />flows of the Colorado River). <br />Within the Upper Basin, the Colorado River is allocated according to the following percentages: <br />Colorado = 51.75% <br />Utah = 23% <br />Wyoming = 14% <br />New Mexico = 11.2 5% <br /> 5 <br />