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. -6- . 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 800 acre- feet less than during that period in the 6th year. The remaining 34,600 acre-feet comprised additional waters voluntarily by-passed by Mexico, and this quantity was about 6,200 acre-feet greater than during that period in the 6th year. The final period discharges and those in prior years are listed below: DISCHARGES WELLTON-MOHAWK EXTENSION CHANNEL TO COLORADO RIVER BELO\-I MORELOS DAN During Winter Additional Minimum Flows By-Passed Operation Total Per Minute No. 218 By Mexico Year Acre-Feet Acre-Feet Acre-Feet Is t 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 6th year (1971) 103,300 55,200 48 , 100 Final period (1972)* 61,000 26,400 34,600 *November 16, 1971 through June 30, 1972 The Bureau of Reclamation reports that all of the 26,400 acre- feet which was discharged to the river belm' Morelos Dam, during minimum "inter flow periods of 1971 ' 72 required replacement by releases from above Imperial Dam to satisfy minimum deliveries to Mexico, / b) South Gila Va lley Pumping. The second largest source of return fio"s to the river belm' Imperial Dam and above Norelos Dam, is the pumped ground "aters from the South Gila Valley. For the final period 'of operation, 'quantities are estimated at 36,132 acre-feet'-a decrease of 4,158 acre-feet over the quantity pumped in the comparable period in the 6th year. The salinity records indicate a slight increase in the average concentration from 2280 to 2310 ppm. Comparative records are tabulated as follows and are shmm graphically on Exhibit 6. .