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. A REPORT ON OPERATIONS FOR THE SOLUTION OF THE INTERNATIONAL PROBLE~ OF THE SALINITY OF THE COLORADO RIVER UNDER MINUTE NO. 242 FOR THE PERIOD ~ . ~J January 1, 197B - December 31, 1978 ,1'\ Ihis report presents the results of operations under the agreement incor- porated in Minute No. 2l,2 dated August 30, 1973, of the International Boundary and \~'ater Commission, United States and Hexico, entitled "Perma- nent and Definitive Solution to the International Problem of the Salinity of the Colorado River." The operations began on June 25, 1974, immediately following approval of the Enabling Legislation, Public Law 93-320. This report describes operations during the fourth full calendar year from January 1, 1978, through December 31, 1978. This report is based upon the records of flows and salinities secured jointly by the United States and Mexican Sections of the International Boundary and Water Commission, the U.S. Bureau of Reclamation, and the U.S. Geological Survey. Locations and features referred to in this report are shown on the map Exhibit 1. The records show that the United States operations were in compliance with the agreement in Minute No. 242. The Salinity Differential . Minute No. 242 provides in Point 1 that: "The United States shall adopt measures to assure that . . . the approximately 1,360,000 acre-feet (1,677,545,000 cubic meters) delivered to Mexico upstream of Morelos Dam, have an annual average salinity of no more than 115 ppm ~ 30 ppm U.S. count (121 ppm + 30 ppm Mexican count) over the annual average salinity of Colorado River waters which arrive at Imperial Dam II The records show that during the calendar year 1978: 1) Colorado River water deliveries to Mexico upstream of Morelos Dam amounted to: 1,464,482 acre-feet (1,806,424,000 cubic meters). 2) The average salinities of the waters a) Morelos Dam and b) arriving at Imperial ity differential were as follows: delivered to Mexico upstream of Dam and c) the resulting salin- 1/ pprrr Waters a) Delivered to Mexico upstream of Morelos Dam Total Dissolved Solids in 1978 U.S. Mexican Count Count .' b) Arriving at Imperial Dam c) Salinity Differential 928 812 116 991 870 121 1/ The differences in U.S. count and Mexican count are due to use of different methods of analyses and of computing the total dissolved solids, by each country's laboratory.