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~ ~ 0') .-l C o PLATE 6 COLORADO RIVER BASIN RESERVOIRS STORAGE AND CAPACITY " r '" " " LA~E POWELL FlA~ING GORGE NAVllJO BLUE MESA FONTENElLE MORRO'HPOINT , ~ Q W Q ~ " , 0 j " Q > " < '" ___ACTIVE CI\FACI~Y 19~O WATER YEAR 1960 1969 . 0'"10" eo"oed, .",.,,'",.., o( Lo" "'0" Plate 7 shows changes in contents of the major mainstream reservoirs during the 1968 -69 water year. Uses and Losses. The major portion of depletions in the Upper Basin are not mea- sured. Measurements are made only of trans- mountain diversions, which are about 15 per- cent of the total depletions. The Bureau of Reclamation computes irrigation depletions by applying a unit rate to an estimated acre- age. The unit rate is derived for each year by applying to the estimated long-time average a factor varying with annual runoff, indicat- ing uses greater than average in years of high runoff and less than average in years of low runoff. Preliminary total depletions includ- ing trans mountain diversions and estimated evaporation from reservoirs in 1968-69 at Lee Ferry were estimated by the Bureau to be 2,928,000 acre-feet, an 8,000 acre-feet in- crease from the estimated 1967-68 deple- tions. 26 On January 17, 1969, a contract was en- tered into between the United States and the Salt River Project Agricultural Improve- ment and Power District for diversion of a maximum of 40,000 acre-feet per year of Colorado River water from Lake Powell. The water is to be used for thermal generation of electric energy and associated purposes (Navajo Power Project). A maximum con- sumptive use of 34,100 acre-feet per year is allowed and a charge of $7 per acre-foot per year of scheduled deliveries will be made. Another water delivery contract regarding development of the proposed Kaiparowits thermal generating plant in southern Utah near Lake Powell was signed by the Secre- tary of the Interior on October 2, 1969. The contract deals with water service from Lake Powell for a maximum of 102,000 acre-feet per year for cooling purposes and other oper- ational needs. Table 3 DIVERSIONS MINUS MEASURED RETURNS LOWER COLORADO RIVER (Thousands of Acre-Feet) Water lFear /965 1966 1967 1968 1969 California Palo Verde Irrig. Dist. ........................ 373 384 365 387 386 Metropolitan Water Dist......................... 1,180 1,121 1.182 1.105 1.139 Yuma Project Reserv. Div. .......... 46 48 51 56 65 Imperial Irrig. Dist... 2,756 2,778 2,860 2,745 2,766 Coachella Valley Co. Water Dist............. 526 484 453 469 490 Total .......................... 4,881 4,815 4,911 4,762 4.846 Arizona Colorado R. Indian Reservation ............ 178 186 200 237 214 Gila Project................ 616 555 566 559 613 Yuma Proj. Valley Div. ............ 182 162 171 170 170 Total.................... 976 903 937 966 997 Ncvllda Pumping from Lake Mead ...................... 23 25 27 1I 34 Grand Total...... 5,880 5,743 5,875 5,759 5,877