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I I I I I I I I I I I I I I I I I I I their flows. Figure 7 shows the end of Wellton-Mohawk's main drainage conveyance channel. This is just downstream from the Gila Siphon on the Gila Gravity Main Canal. The water was allowed to flow into the old channel of .the Gila River and thence into the Colorado. The first effluent came out of this channel on February 10, 1961 and that's when all hell broke loose. Chan~es in Mexicali and San Luis Valleys Now I refer you to Figure 8. This is the most important diagram in this presentation. This shows the flow of the Colorado River at the Northern Boundary at Andrade and .'Algodones in acre feet per year from 1951 to 1971. (For quantities see Figure lOa). You will note that the flow was very high in 1952, in fact, it was over 10,000,000 acre feet. This dropped to a little over 3,000,000 in 1955 which was the year of the greatest cultivated cotton acreage in Mexicali and San Luis Valleys at approximately 530,000 acres. This was the year that James V. Stone, Manager of the Compania Ind~strial Jabonera del pacifico, the Anderson-Clayton Cotton subsidiary in Mexicali, spoke at a Colorado River Water Users Association meeting and said that the two valleys in Mexico were using all the flow of the river and needed more. The flow dipped to a little over 1,600,000 acre feet in 1956 and cotton acreage dipped with it but there was a greater flow in 1957, 58 and 59 and cotton acreage slightly increased, Then the flow dropped to a little over 1,600,000 in 1961, rose to about 1,700,000 in 1962 and 63 and then dropped to something at or below 1,500,000 from 1964 on to this date. (The reason that the flow at the Northern Boundary is shown as less than 1,500,000 acre feet is that Mexico is credited with the flow from the canal spillways in the Yuma Valley plus the approximate 135,000 acre feet per year taken from the spill of the Yuma.Valley's East Main Canal and Main Drain at the Boundary Pumping Plant in San Luis, thus -4-