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<br />. <br /> <br />Morelos Dam in open drains. A portion of this return tlow water is seepage from the <br />All-American Canal adjacent to the Division. The amount of undertlow to the river from <br />the Division is not known. There were 41,300 acre-feet of irrigation return tlows recorded <br /> <br />in 1974. <br /> <br />. <br /> <br />The Valley Divison, in Arizona, totals about 53,500 acres, and extends south <br />from the city of Yuma to the Mexican border. The distribution system for the Division <br />consists of three main canals with a combined length of 61 miles and some 118 miles <br />of laterals. There were 329,700 acre-feet of water diverted for irrigation in 1974. Irrigation <br />return tlows from the Division are delivered to Mexico at the Southerly International <br />Boundary and make up a part of Mexico's Treaty waters. Drainage is from a system <br />of open drains supplemented by drainage wells along the eastern part of the valley. There <br />were 108,600 acre-feet of drainage and wasteway tlows recorded at the Southerly <br />International Boundary in 1974. <br />Water for project use is diverted from the Colorado River at Imperial Dam, <br />about 18 miles north of Yuma, and is transported to the project by the All-American <br />Canal. A turnout at Siphon Drop Powerplant, several miles southwest of Imperial Dam, <br />was placed in operation in 1941 to furnish water to the 2,000 ft3/s capacity Yuma Main <br />Canal. This canal supplies a portion of the land of the Indian Unit of the Reservation <br />Division and is siphoned under the Colorado River to serve the Valley Division lands. <br />The remaining lands on the Reservation Division have been irrigated directly from the <br />All-American Canal since 1948. Laguna Dam, the original diversion point for the Yuma <br />Project, located about 13 miles north of Yuma, is still maintained for river control and <br />facilitation of operations at Imperial Dam. <br />Yuma Project lands produce alfalfa hay and seed, winter vegetables, cantaloupes <br />and watermelons, cotton, sorghums and small grains, pasture crops, dates, and citrus fruit. <br />Some crops also provide for the seasonal feeding and pasturing of livestock. <br /> <br />A.3.b. <br /> <br />Yuma Auxiliary Project <br />This project is situated on the Yuma Mesa in Arizona, about halfway between <br /> <br />. <br /> <br />Yuma and Mexico. Its 3,400 acres are devoted to growing grapefruit, oranges, lemons, <br />and other citrus fruits. As authorized in 1917. the project comprised 45,000 acres of which <br /> <br />12 <br />