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<br />003145 <br /> <br />Page 44 <br /> <br />Table IV-2. Projected Average Annual Colorado River Water Disposition, <br />Full Development Conditions <br />(Thousands of Acre Feet) <br /> <br />With Existing Interstate <br />Water Allocation <br />Institutions <br /> <br />Without Existing <br />Interstate Water <br />Allocation Institutions <br /> <br />Natural <br />Flows <br />Only <br /> <br />Flows Augmented <br />by Vegetation <br />Manipulation <br /> <br />Natural <br />Flows <br />Only <br /> <br />Flows Augmented <br />by Vegetation <br />Mani pula tion <br /> <br />Upper Basin <br /> <br />Consumptive Use <br />Evaporation <br />Shortages <br /> <br />5244 <br />631 <br />18 <br /> <br />5244 <br />640 <br />18 <br /> <br />5104 <br />614 <br />158 <br /> <br />5126 <br />621- <br />136 <br /> <br />Lower Basin <br />Consumptive Use <br />Evaporation <br />Shortages <br /> <br /> <br />8236 <br />766 <br />628 <br /> <br />8755 <br />656 <br />109 <br /> <br />8771 <br />668 <br />93 <br /> <br />, <br />I <br />I <br />H <br /> <br />Net Change in <br />Reservoir Contents <br /> <br />-757 <br /> <br />-737 <br /> <br />-833 <br /> <br />-833 <br /> <br />Outflow to Mexico <br /> <br />/267ij <br />L...-/ <br /> <br />2095 <br /> <br />1869 <br /> <br />1894 <br /> <br />Shortages would have been greater without average annual net withdrawals <br /> <br />~ <br /> <br />from storage of 757,000 acre-feet per year. Over the 72-year record this totals <br /> <br />54 MAF, representing 87 percent of total storage capacity. This stored water <br /> <br />was used to supply deficits during the longer than 50-year, unbounded critical <br /> <br />period represented by the data. Shortages began to occur near the end of the <br /> <br />historic trace. <br /> <br />The effects of enhancing Colorado River flows through vegetation <br /> <br />manipulation in the full development scenario also are shown in Table IV-2. In <br /> <br />summary, these effects were to reduce Lower Division shortages by about 16,000 <br /> <br />acre-feet annually, to increase total evaporation by 20,000 acre-feet, and to <br /> <br />increase reservoir storage and outflow to Mexico by approximately 20,000 and <br /> <br />24,000 acre-feet, respectively. When compared with the current demand scenario, <br />