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Beneficial Consumptive Uses An extensive discussion of consumptive uses is treated in detail in Reclamation's "Colorado River System Consumptive Uses and Losses Report, 1981.1985: This report is prepared jointly by the Upper and Lower Colorado Regional offices. The report presents estimates of the consumptive uses and losses from the Colorado River System for each year from 1981 through 1985. The table on the following page was created using the data from the Consumptive Uses and Losses Report (June 1991). The table summarizes annual water use from the system by States, including water use supplied by ground-water overdraft. Work is now taking place to compile the 1986-1990 report. For the 1986-1990 report new techniques will be utilized to compute consumptive uses and losses. The new report will use Geographic Information Systems, Remote Sensing and Image Processing to determine irrigated acres, crop types and to compute the consumptive uses of these crops. It is expected that the 1986-1990 report will be completed in 1995. Upper Basin Uses and Losses The three largest categories of consumptive uses and losses in the Upper Colorado River Basin are agricultural uses within the basin, transbasin diversions to adjacent drainages, and evaporation losses from the major reservoirs. In water year 1993, 1,098 million cubic meters (890,000 acre-feet) were diverted for use in adjacent drainages. The total for transbasin diversions in water year 1994 has not yet been tabulated but the f1gute is expected to be similar to the 1993 total. Lomr BasIn Uses and Losses In the United Slales Releases of approximately 1.11 billion cubic meters (9.0 million acre-feet) were made from Lake Mohave during water year 1994, to provide for releases to meet minimum downstream needs in the United States at Parker Dam; to supply diversion requirements of MWD and CAP, miscellaneous contractors, and other users; to offset evaporation and other transit losses between Davis and Parker dams; and to maintain the scheduled levels of Lake Havasu. During water year 1994, releases of approximately 1.16 billion cubic meters (9.4 million acre-feet) were made from Lake Mead at Hoover Dam. These releases regulate the levels of Lake Mohave, provide for the small users on that reservoir, and provide for releases at Davis Dam to meet needs in the U oited States. 1n addition, 392.2 million cubic meters (318,000 acre-feet) were diverted from Lake Mead for use by the Lake Mead National Recreation Area; Boulder City; Basic Management, Inc.; and contractors of the Colorado River Commission of Nevada. Of the diversions from Lake Mead, approximately 247.5 million cubic meters (200,700 acre-feet) were consumptively used and the remainder returned to Lake Mead. Total releases and diversions from Lake Mead during water year 1994 were 1.16 billion cubic meters (9.40 million acre-feet). For water year 1995, a total release of 8.51 billion cubic meters (6.9 million acre-feet) from Lake Havasu is projected, including consumptive use requirements in the United States below Parker Dam, transit losses and regulation in the river between Parker Dam and the Mexican Border, and treaty deliveries to Mexico. It is expected that MWD will divert 1.60 billion cubic meters During water year 1994, an estimated 8.57 billion cubic (1.30 million acre-feet) by pumping' from Lake Havasu meters (6.94 million acre-feet) of water were released from during water year 1995. Similarly, the CAP is expected to -,Lake Havasu-(Parker-Dam)-to-meet-the-requirements-for- _Pl!l!lP_BPl!"olCimately.2:!7"s. milli~cubic meters (760,000 water deliveries at Imperial Dam, as well as those of the acre-feet). Consumptive uses by small users, river losses or Colorado River Indian Reservation near Parker, Arizona, the gains, and reservoir losses between Davis Dam and Parker Palo Verde Irrigation District near Blythe, California, other Dam are projected to be a net loss of 43.2 million cubic miscellaneous users along the river, and transit losses meters (35,000 acre-feet). between Parker Dam and Imperial Dam. The major water diversions above Parker Dam were by the Metropolitan Water District (MWD) of South em California and the Central Arizona Project (CAP). MWD pumped approximately 1.60 billion cubic meters (13 million acre- feet) from Lake Havasu during water year 1994, and approximately 950 million cubic meters (770,000 acre-feet) were pumped for the CAP. During water year 1995, diversions from Lake Mead are projected at 420.6 million cubic meters (341,000 acre-feet). Evaporation from Lake Mead is projected to be about 1.10 billion cubic meters (890,000 acre-feet) and net gain between Glen Canyon Dam and Lake Mead is expected to be about 1.01 billion cubic meters (820,000 acre-feet). 23