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<br />. <br /> <br />~ <br />Q <br />....:! <br />w <br /> <br />-2- <br /> <br />2) The average salinities of the waters of the Colorado River a) upstream of <br />Morelos Dam and b) arriving at Imperial Dam and c) the resulting salinity <br />differential were as follows: <br /> <br />Waters <br /> <br />Total Dissolved Solids in <br />1983 <br />u.s. Count Mexican <br /> <br />ppnd./ <br /> <br />Count <br /> <br />a) <br /> <br />Colorado River upstream of <br />Morelos Dam <br /> <br />810 <br /> <br />742 <br /> <br />b) Arriving at Imperial Dam <br /> <br />733 <br /> <br />788 <br /> <br />c) Salinity Differential <br /> <br />9 <br /> <br />22 <br /> <br />The Commission agreed by exchange of letters that the records show that the <br />differential during calendar year 1983 was in accord with above cited Point <br />1 of Minute No. 242. <br /> <br />~e results of operations under Minute No. 242 since it became effective on <br />June 24, 1974 are tabulated as follows: <br /> <br /> Salinity in ppm (U.S. Count) <br />. Year Imperial Dam Above Morelos Dam Differential <br />1974 (June 25 to December 31) 832 972 140 <br /> 1975 829 964 135 <br /> 1976 823 955 132 <br /> 1977 820 943 123 <br /> 1978 812 928 116 <br /> 1979 809 739 70 <br /> 1980 755 740 15 <br /> 1981 806 924 118 <br /> 1982 825 933 108 <br /> 1983 733 742 9 <br /> <br />. <br /> <br />The results of operations under Minute No. 242 are shown graphically on Exhibit <br />2, which also shows the salinity of the waters arriving at Imperial Dam and <br />of the waters made available to Mexico at the Northerly International Boundary <br />since 1951, the first full year of deliveries to Mexico under the Water Treaty <br />of 1944. <br /> <br />1/ The difference in U.S. count and Mexican count are due to use of different <br />methods of analyses and o'f computing the total dissolved solids, by each <br />country's laboratory. <br />