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<br />IlO~~77
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<br />
<br />2 WATER SUPPLY FOR THE SAN JUAN-CHAMA PROJECT
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<br />at poirits'M use can exceed depletion at Lee Ferry (p. 77). The
<br />operation study is discussed on pages 76-78 of those printed hearings.
<br />The study covers the period 1909-56 and assumes 43 million acre-feet
<br />of effective storage in the upper basin. It assumes zero storage at
<br />the beginning of the study and shows a storage shortage of 783,000
<br />acre-feet at the end of the period, due to the unprecedented drought
<br />of 1953 through 1956. It shows that, under the water supply con-
<br />ditions of the 1909-56 period, the upper basin States would be able
<br />to deplete the flows of the Oolorado River at Lee Ferry by 7.2 million
<br />acre-feet per year and release 7.5 million acre-feet per year to the
<br />lower basin, plus spills in high-water years. The period of the study
<br />is the same as that used by both Oalifornia and Arizona in the Supreme
<br />Oourt litigation, Arizona v, California. The virgin flow at Lee Ferry
<br />during the period averaged 15.2 million acre-feet. In order to show
<br />how the obligation to deliver water to Mexico and the lower basin
<br />allocation of consumptive use" would be met under his study, Mr.
<br />Reynolds presented the following additional information;
<br />
<br />'-
<br />
<br />Availability of waters of the Colorado River sy.tem
<br />
<br />";\'~.c~ ,
<br />
<br />Item Acre-feet Reference
<br />Virgin flow of Colorado River at Lee FerrY___~~_h___________~__~uu__ Millions
<br /> 15.2 Arizona Ex. No, 355,
<br />Upper basin consumptive use_ ___':._.~.,.____~___~_u_____.__._________~_ -7.2
<br />Total___________________________________________________________~ 8.0
<br />Virgin tributary contribution Lee Ferry to Hoover Dam__h________~M 1 +1.1
<br />Virgin tributary contribution Hoover Dam to international boundary_ 1 +1.4
<br />TotaL___________________________________________________________ 10,5
<br />Lower basin consumptive use_ __~~_______nn~_nnn____nn_____~___ -8.5
<br />Total n _ __ __ __ _ _ ____ _ _ _____ _ _ _ _ ____ _ _. _ _.. __ _ _ _ _ __ _~ __ __ _ ____ _ ___ 2.0
<br />Net channel losses Hoover Dam to international boundary______nn__ -,3 Arizona Ex. No. 366.
<br />TotaL___________________________________________________________ 1,7
<br />Required delivery at international boundary____________n_n_nn__n -1,6 DO.2
<br />Remainder _ _ ____ _ __ _ _ __ _ _ _ _ _ _ __ __ _ __ ___ _ _ _. _.. _. ___. _. _ __. ___ ___ ,1
<br />
<br />1 Values indexed from IlReport on Water Supply of the Lower Colorado River Basin, Bureau of ReclamiV
<br />tion Project Planning Report, November 1952."
<br />1I Includes regulatory loss of 75,000 acre-feet.
<br />
<br />Oolorado studies
<br />The Hill study, which was referred to during the Oommittee's
<br />hearings, was a study dated October 19, 1953, entitled "Depletion of
<br />Surface Water Supplies of Oolorado West of the Oontinental Divide,"
<br />by Leeds, Hill & Jewett, consulting engineers, and prepared for the
<br />Oolorado Water Oonservation Board. The purpose of the study,
<br />which was authorized by the 39th General Assembly of the State .of
<br />Oolorado, was to determine the water resources available from surface
<br />supplies in that part of Oolorado which lies west of the Oontinental
<br />Divide and determine the present and potential uses thereof. While
<br />Mr. Hill concluded that "all of the 7.5 million acre-feet of water per
<br />annum apportioned to the upper basin by the Oolorado River compact
<br />may not actually be available for use because of the requirement
<br />that 75 million acre-feet be delivered at Lee Ferry during each con"
<br />8ecutive 10-year perioa"'thereport states that there could have been
<br />annual depletions in the upper basin aggregating 7.5 million acre-feet
<br />under the water supply conditions of the entire period 1917-52 and
<br />with 38 million acre-feet of reservoir storage capacity available.
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