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<br />.r () 01 ("I <br />. u" <br />~ab~e 2 shows changes in storage for the Colorado River Storage <br />Project reservoirs and Fontenelle Reservoir in the Upper Basin, and <br />the major Lower Basin reservoirs in water year 1977-7$. Overall, the <br />total storage increased by 2,594,000 acre-feet during the year. <br /> <br />27,000 25,002 16,567 + 424 <br />3,7S9 3,749 2,$26 + 747 <br />1,709 1,696 l,23S + 200 <br />941 S30 728 + 507 <br />346 345 322 + 27 <br />117 117 114 0 <br />26 lS 17 5 <br />33,92S 31,757 21,812 + 1,900 <br /> <br />TABLE 2 <br /> <br />CAPACITY, ACTIVE STORAGE, AND STORAGE CHANGE <br />OF MAJOn COLORADO RIVER BASIN RESERVOIRS <br />DURIlm HATER YEAR 1977-78 <br />(Thousands of Acre-feet) <br /> <br />Gross <br />Capacity <br /> <br />Active <br />Storage <br />Sept. 30, <br />1978 <br /> <br />Usable* <br />Capacity <br /> <br />Upper Basin <br /> <br />Lake PO\'Tell <br />Flaming Gorge <br />Navajo <br />Blue Nesa <br />Fontenelle <br />l1orrm'l Point <br />Crystal <br /> <br />Subtotal <br /> <br />Lower Basin <br /> <br />Lake r.iead <br />Lake r.iohave <br />Lake Havasu <br /> <br />2S,537 <br />l,SlS <br />648 <br /> <br />26,159 <br />1,810 <br />619 <br /> <br />20,876 <br />1,484 <br />572 <br /> <br />Subtotal <br /> <br />23,53$ <br /> <br />31,003 <br />64,931* <br /> <br />22,932 <br />44,744 <br /> <br />Total, Both Basins <br /> <br />60,345* <br /> <br />Change <br />During <br />Year <br /> <br />+ 672 <br />+ 19 <br />+ 3 <br /> <br />+ 691: <br />+ 2,594 <br /> <br />* Includes 4,132,000 acre-feet of flood control storage space <br />which must be evacuated by January 1 of each year. <br /> <br />The Bureau of Reclamation has assumed that the amount of water <br />that percolates into the areas adjacent to L~<e POl'lell is not lost but <br />has gone into ground \'Iater storage or "banl< storage". It is the residual <br />resulting from a hydrologic balance of Lake Powell inflow, outflow, change <br />in surface storage, and evaporation. Evaporation and a portion of the <br />inflol'l must be estimated; thus, the estimated banl< storage is subject to <br />\rlde variation and possible error. The 1978 year-end bank storage in <br />Lake PONell was estimated to be 10.2 maf, representing an increase in <br />bank storage from 1977 of about O.S maf. <br /> <br />- 3 - <br />