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.. . . . -8- a) The average salinity of waters delivered to Mexico at the northerly boundary under United States operations was 1266 ppm for the period November 16, 1971 thru June 30, 1972 as compared with a salinity of 1391 ppm for the similar period November 16, 1964 thru June 30, 1965; a reduction of 125 ppm. As a result of Mexico voluntarily by-passing additional Wellton- Mohawk drainage waters the average salinity of waters diverted by Mexico at Morelos Dam was 1174 ppm for the period November 16, 1971 thru June 30, 1972, as compared with 1391 ppm for the similar period November 16, 1964 thru June 30, 1965; a reduction of 217 ppm. b) The average salinity of the total quantity of Wellton-Mohawk drainage waters in the conveyance channel (above the first point of return to the river) was 3630 ppm for the period November 16, 1971 thru June 30, 1972, as compared to 4610 ppm for the period November 16, 1964 thru June 30, 1965; a reduction of 980 ppm. c) The average salinity of the total quantity of South Gila Valley drainage waters entering the Colorado River channel above Morelos Dam was 2310 ppm for the period November 16, 1971 thru June 30, 1972; as compared to 2390 ppm for the period November 16, 1964 thru June 30, 1965; a reduction of 80 ppm. During this period, the average annual salinity of the waters of the Colorado River at Imperial Dam delivered to Mexico was 910 ppm in 1965 just prior to the five'year agreement. In 1966, the salinity reduced to 894 ppm, and in 1967 to 799 ppm. Then in 1968, 1969, and 1970, the salinity increased successively to 851 ppm. In 1971 there was a slight reduction to an average of 848 ppm. This improvement continued in 1972 effecting an average of 832 ppm at the termination of Minute No, 218 on June 30. 8. Related Matters a) Hexico I s Rehabi li tation Plans. The rehabili ta tion of the Mexicali Valley irrigation and drainage sys tern, wh ich "as ini tiated in June 1969, continues to progress. It is reported that, to November 30, 1972, about 221 miles of canals have been lined; about 283 miles of drains have been constructed or rehabilitated; 63 wells have been installed and 119 wells have been reconditioned and repaired. All of the 63 wells installed in the Mexicali Valley are replacement wells located near the wells which they replace.