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<br />002051 <br /> <br />54 <br /> <br />ASSEMBLY !NTER!M COl\U,HTTEE ON "\V~T~R <br /> <br />expected to increase over the period of the next 65 years. Tables XII <br />and XIII are compared to show the future water supply and water <br />requirement in Table XIV, which shows the total water deficieney in <br />the Pacific Southwest area, using first the Department of Interior <br />estimates and then the Colorado River Board estimates. Consistent <br />with the differences in estimated water supply, larger deficiencies are <br />estimated by the Colorado River Board than by the Department of <br />Interior. <br />These data are for the entire Paeific Southwest area. At the present <br />time line A5 of Table XIV indicates that there is a 1.43 million acre- <br />foot deficiency in the entire Southwest. This represents mined gronnd <br />water. As will be discussed below, the overall deficiency is localized in <br />certain parts of the Pacific Southwest while conditions are in balance <br />in others. The overall conditions of deficiency make it abundantly <br />clear that thc entire Southwest is deficient and shonld work together to <br />develop more water even though eertain areas are concerned less with <br />critical deficiencies at the present than others. <br />The three Tables XII-XIV are graphically summarized on Figure 3, <br />which shows the estimates of supply and demand with California lim- <br />ited to 4.4 million acre-feet a year (the assumption utilized through- <br />out this report). <br /> <br />TABLE XII <br />COMPARISON OF PACIFIC SOUTHWEST WATER SUPPLY DATA, USDI AND CRB <br /> <br />(Unit: million acre.feef) <br /> <br /> Development year <br /> Item Present 1975 1990 2000 2030 <br />A. United States Department of Interior <br />L Release at Glen Canyon Dam_________________ 8.600 9.840 9.100 S.6OO 8.220 <br />2. Unclep!eted net gain, Glen Canyon to Lake <br /> Mead, and release from storage-Lake Mead__ 1.060 1.270 1.410 1.435 1.435 <br />3. Undep!eted inflow-Bill Williams River_________ 0.080 0.080 0.080 0.080 0.080 <br />4. Arizona water supply-Gila Basin safe yieldn__ 1.700 1. 700 1.700 1. 700 1. 700 <br />5. California water supply <br /> Los Angeles Aqueduct___ ___________________ 0.320 0.480 0.480 0.480 0.480 <br /> California Aqueduct______./-___ _____________ -------- 0.500 1.800 1. 900 1. 900 <br /> Safe yield local aources_____________________ 1.400 1.430 1.4.50 1.450 1.450 <br /> TotaI_________________________________ 1,720 2.410 3.730 3.830 3.830 <br />6. Colorado River salvage________ ____ ___________ -------- 0.680 0.680 0.680 0.680 <br />7, Total water supply___________________________ 13,160 15.980 16,700 16.325 15.945 <br />B. Colorado River Board <br />1. California Aqueduct enlargement______________ -------- -------- +0.500 +0.500 +0.500 <br />2. Reduced estimate of Colorado River supply <br /> available for consumptive use_______________ -------- -0.725 - 1. 255 -1.080 -0.830 <br />3. Total water supply (line A7 + Bl + B2)__~__w_ -------- 15,255 15.945 15.745 15.615 <br /> <br />Sources: <br />U,S.D.I. Estimate-Pacific Southwest Water Plan Report of January 1964, Table 16, pp. IV-ll and U.S.B.R. rough <br />estimate of extension for year 2030 C,R.B. Modification-Line B!-Based on recent announcement by Department <br />of Water Resources. (C.R.B. 8-13~64.) <br />From: Colorado River Board. <br />