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- 5 - . WELLTON-MOHAWK DRAINAGE WATERS At Station 8+30 in Conveyance Channel (Operation Vears) VEAR Previous year to Agreement Operations 1965 (Calendar year) WATER SAL T SALT Acre - Feet Tons - ppm 175,300 1,117,000 4680 216,100 1,399,000 4760 211,200 1,324,000 4610 219,800 1,317,000 4410 218,300 1,227,000 4130 219,300 1,129,000 3790 1st year of Operation 2nd year of Operation 3rd year of Operation 4th year of Operation 5th year of Operation* 1966 1967 1968 1969 1970 * Partly estimated. . The Extension Channel discharges to the Colorado River below Morelos Dam during the 5th year amounted to 129,700 acre - feet -- about 25% more than in the 4th year. Of the total quantity of woters by-passed to the river below the dam during the 5th year about 53,900 acre-feet resulted from United States operations under Minute No. 218, namely the by- passing of waters during periods of winter minimum flow, and was about the same in quantity as during the 4th year. The remaining 75,800 acre- feet comprised additional waters voluntarily by-passed by Mexico, and this quantity was about 50% higher than in the 4th yeor. The 5th year discharges and those in prior years are listed below: DISCHARGES WELLTON-MOHAWK EXTENSION CHANt'--IEL TO COLORADO RIVER BELOW MORELOS DAM During Winter Additional Operation Total Minimum Flows By- Passed Vear Acre- Feet Per Minute 218 By Mexico Acre- Feet Acre - Feet . 1st year (1966) 100,800 54,400 46,400 2nd year (1967) 99,000 58,300 40, 700 3rd year (1968) - 103,900 52,600 51,300 4th year (1969) 103,600 53,500 50,100 5th year (1970) 129,700 53,900 75,800 . The Bureau of Reclamation reports that the entire 53,900 acre-feet which was discharged to the river below Morelos Dam, during minimum winter flow periods in the 5th year, required replacement by releases from above Imperial Dam to satisfy minimum deliveries to Mexico.