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, Riverside and Riverside Extension Canals. A total of 62 laterals and sublaterals are operated in the EI Paso Valley. Thirty-four of these laterals and sublaterals are supplied from the Franklin Canal; 23 are supplied from the Riverside and Riverside Extension Canals, and 5 are supplied from the Tornillo Canal. Some unauthorized Mexican diversions occur from the Rio Grande below the American Diversion Dam. Additionally, there are non-project and non-HCCRD diversions on the United States side of the Rio Grande below HCCRD. Unlike the Rincon and Mesilla Valleys, the diversion and distribution facilities in use in the EI Paso Valley have changed significantly over the years as the result of changes in the Rio Grande channel brought about by Rio Grande Rectification. The changes in the diversion and distribution facilities are discussed later in this report. The following discussion pertains to the diversion and distribution facilities that presently exist in the valley. The American section of lewc constructed the American Diversion Dam and American Canal in 1937-38 and currently operates these facilities. The American Diversion Dam is located on the Rio Grande immediately above the point where the Rio Grande becomes the international boundary. Its purpose is to regulate and control the flow in the river for delivery to EPCWlD and the Republic of Mexico. Water for the EPCWlD is diverted into the American Canal on the north or east side of the Rio Grande; water for the Republic of Mexico is left in the Rio Grande for diversion at the International Diversion Dam. The American Canal carries water a distance of 2.1 miles from the American Diversion Dam to the Franklin Canal; it is concrete lined and was designed for a capacity of 1,200 cfs. Water in excess of the capacity of the Franklin Canal, including water intended for re-diversion at the Riverside Diversion Dam, is discharged back to the Rio Grande through Wasteway No.1, the Leon Street Wasteway, and the Ascarate Wasteway. The flows in the Rio Grande below the American Diversion Dam have been measured by IBWC since it was constructed. Table 2-7 summarizes the records for these flows. As indicated above, these flows reflect deliveries to Mexico and water that was surplus to both the Rio Grande Project and Mexico. Overall, these flows averaged 118,291 acre-feet during 1939- 95 and ranged from 10,003 acre-feet in 1956 to 1,093,614 acre-feet in 1942. Deliveries to Mexico will be analyzed in detail later in this report. r, ~ ^ ,. " '.JV t:;Jo 2 -15 "','"."