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<br />" .- '. ," <br />.LivU <br /> <br />HATER QUALITY <br /> <br />Salinity at the International <br />Boundary <br /> <br />During the 1974 ~alendar year, the average flo;-l-weighted <br />salinity of the waters delivered to nexico above J:lorelos Dffill was <br />962 ppm and the salinity of the Colorado River waters which arrived <br />at Imperial Darn was 835 ppm. Thus, the differential between the <br />average salinities at 1-10relos Dam and Imperial Dam was l27 prcn. <br />This value falls within the requireiilent of I--iinute 242 of the Icltei-- <br />national Boundary and Vlater COiTllnission that the differenti:ol be no <br />greater than 115 ~ 30 ppm. <br /> <br />During the same period, all of the \lellton-i-Iohawk Project <br />dC'2inage return flovls, ffiuounting to 210,700 acre-feet, vlere by- <br />i)Hssed to the Colorado River below I-lorelos Dffin. Of this araount, <br />SO,900 acre-feet were bypassed voluntarily by Mexico and, according <br />to Article 2 of I'linute 242, did not require replaceiilent by the Unit;ed <br />States. The remaining 159,300 acre-feet that were bypassed Here <br />replaced I-lith 58,100 acre-feet of ground \vater from the Yu;na i:lesa <br />well field and 101,700 acre-feet of releases from stor3.g". <br /> <br />Table 9 summarizes operations under i:hnutes j.jos. 218, 241, <br />and 242 for the period 1965 through 1971,. <br /> <br />Colorado River Basin Salinity <br />CQi'itrol Progrffiil <br /> <br />On June 24, 1974, President J.jixon signed into law the "Colorarl.o <br />River Basin Salinity Control Act", P.L. 93-320. The public law is <br />reproducGd belo.,;i. <br /> <br />- 11 - <br />