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<br />J#'._.... .., <br />li"v~ <br /> TABLE 2 <br /> CAPACITY, ACTIVE STORAGE, A lID ST mAGE C HA HGE <br /> OF liAJOR COLORADO RIVER BASI1~ RESERVOIRS <br /> DURING \lATER YEAR 1973-74 <br />, (Thousands of Acre-Feet) <br /> Gross Usaole Active Change <br /> Capacity Capacity Storage Duri ng <br /> Sept. 30, Year <br /> 1974 <br />Upper Basin <br />Lake Powell 27,000 25,002 13, 011 + 727 <br />Flaming Gorge 3,789 3,749 3,583 + 403 <br />Navaj 0 1,709 1,696 1,010 333 <br />Blue jilesa 941 830 578 133 <br />Fontenelle 345 345 315 22 <br />Morrow Point 117 117 112 3 <br /> Subtotal 33,901 31,739 23,609 + 584 <br />LO\ver Basin <br />Lake [,lead 28,537 26,159 19,358 818 <br />Lake Mohave 1, $113 1,310 1,380 32 <br />Lake Havasu 648 619 563 + 1 <br /> Subtotal 31,003 28,588 21, 301 849 <br />Total Both Basins 64,904 60,327 44,910 265 <br /> <br />" <br /> <br />The Bureau of Reclamation has assumed that the amount of water <br />that percolates into the areas adjacent to Lake Powell is not lost <br />but has gone into ground water storage or "bank storage". It is the <br />residual resulting from a hydrologic balance of Lake Powell inflow, <br />outflow, change in surface storage, and evaporation. Evaporation and <br />a portion of the inflow must be estimated; thus, the estimated bank <br />storage is subject to wide variation and possible error. The 1974 <br />year-end bank storage in Lake Powell was estimated to be 8.1 maf, <br />representing an increase in bame storage from 1973 of 1,000,000 <br />acre-feet. <br /> <br />l'Jater Uses <br /> <br />Colorado River Basin depletions in the Upper Basin are classified <br />by the U.S. Bureau of Reclamation as inbasin conswnptive uses, trans- <br />basin diverSions, and reservoir evaporation. Irrigated agriculture <br />is responsible for most of the inbasin consumptive uses. The quantity <br /> <br />- 3 - <br />