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<br />." .....,.-1.. <br />Ln.;..; <br /> <br />Table 2 shows changes in storage for the Colorado Rive: Storage <br />Project reservoirs and Fontenelle Reservoir in the Upper Bas~n, and the <br />major Lower Basin reservoirs in water year 1976-77. Overall, the total <br />storage decreased by 5,663,000 acre-feet during the year. <br /> <br /> TABLE 2 <br /> CAPACITY, ACTIVE STORAGE, AND STORAGE CHANGE <br /> OF UAJOR COLORADO RIVER BASIN RESERVOmS <br /> DURING HATER YEAR 1976-77 <br /> (Thousands of Acre-feet) <br /> Active <br /> Storage Change <br /> Gross Usable .Sept. 30, During <br /> Capacity Capacity 1977 Year <br />Upper Basin <br />Lake PO~Tell 27,000 25,002 16,143 -3,l:.97 <br />Flaming Gorge 3,789 3,74.9 2,079 -1,395 <br />Navajo 1,709 1,696 1,038 246 <br />Blue r.1esa 941 830 221 385 <br />Fontenelle 346 34.5 295 33 <br />Ji/orrow Point 117 117 114 1 <br />Crystal 26 18 22 + 22 <br /> Subtotal 33,928 31,757 19,912 -5,535 <br />Lotter Basin <br />Lake Uead 28,537 26,159 20, 20~. + 143 <br />Lake Mohave 1,818 1,810 1,465 256 <br />Lake Havasu 648 619 569 15 <br /> Subtotal 31,003 28,588 22,238 128 <br />Total, Both Basins 61,,931 60,3l:.5 lf2,150 - 5,663 <br /> <br />The Bureau of Reclamation has assumed that the amount of water that <br />percolates into the areas adjacent to Lake Powell is not lost but has gone <br />into ground water storage or "bank storage". It is the residual resulting <br />from a hydrologic balance of Lake PatTel1 inflow, outflm'T, change in surface <br />storage, and evaporation. Evaporation and a portion of the inflow must be <br />estimated; thus, the estimated bank storage is subject to wide variation <br />and possible error. The 1977 year-end bank storage in Lclce Powell was <br />estimated to be 9.3 maf, representing a decrease in bank storage from <br />1976 of about 0.1 maf. <br /> <br />Water Uses <br /> <br />Colorado River Basin depletions in the Upper Basin are classified by <br />the Bureau of Reclamation as inbasin consumptive uses, transbasin diversions, <br />and reservoir evaporation. Irrigated agriculture is responsible for most of <br /> <br />- 3 - <br />