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<br />, , <br />~ <br />~ <br /> <br />~ <br />~ <br />~~ <br />I :.\l <br /> <br />~ <br />~ <br />~ <br /> <br />evaporation. For the period 1955-1974, the average annual evaporation loss <br />from Elephant Butte and Caba110 Reservoirs was 63,000 and 26,000 acre-feet, <br />respectively [13]. Based on average measured pan evaporation rates [4] and <br />conservation pool surface areas for Amistad and Falcon Reservoirs, the quan- <br />tities of annual evaporation loss from these impoundments have been calcu- <br />lated to be approximately 400,000 and 600,000 acre-feet, respectively. <br />Actual evaporation losses during the past ten to fifteen years have been <br />less in both of these impoundments, however, since their average storage <br />volumes have been below conservation pool levels by about 20 percent. <br /> <br />I ~ <br />!~ <br />I ~ <br /> <br />! . <br />I? <br />~ <br /> <br />IMPORTS/EXPORTS <br /> <br />l <br />1 <br /> <br />The major import of water into the Rio Grande Region is through the San <br />Juan-Chama Diversion Project. Water from the Colorado River Basin in north- <br />western New Mexico and southwestern Colorado is collected and transported <br />into the Rio Chama Basin, a major tributary of the Rio Grande in WAU 130201. <br />This project was completed by WPRS in 1970, and its purpose is to provide <br />110,000 acre-feet of water annually to supplement municipal, industrial and <br />irrigation water supplies in the middle Rio Grande Basin of New Mexico and to <br />provide a recreation pool in Cochite Lake. Major annual allocations of the <br />water include 48,000 acre-feet for the City of Albuquerque, 20,900 acre-feet <br />for the Middle Rio Grande Conservancy District, 5,600 acre-feet for the City <br />of Santa Fe, and 8,400 acre-feet for evaporation loss in Heron Reservoir, <br />the major storage impoundment for project water in the headwaters of the <br />Rio Chama Basin [18]. <br /> <br />Minor interbasin diversons of surface water into the Rio Grande Basin of <br />Colorado (WAU 130100) are made from the Gunnison and San Juan River Basins in <br />southwestern Colorado. Approximately 4,000 acre-feet are imported annually <br />and used primarily for irrigation [7]. <br /> <br />The only export of water from the Rio Grande Region occurs in the lower <br />Rio Grande valley of Texas (WAU 130900) where major irrigation diversions are <br />made outside of the IBWC flood control levees. Approximately one million <br />acre-feet 'of water are diverted annually from the River into the Nueces-Rio <br /> <br />22 <br /> <br />~",0r.' ~ <br />U~l~~~&j <br />