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<br />o' 'I .! ::) <br />1u...0 <br /> <br />WATEIl. QUALITY <br /> <br />During the 1978 calendar year, che average flow-lleighted salinity <br />of the uaters delivered to Mexico above I!torelos Dam uas 92(5 ppm and the <br />salinity of the Colorado River vlaters llhich arrived at Imperial Dam Has <br />812 ppmo Thus, the differential between the average salinities at <br />I.Iorelos Dam and Imperial Dam was 116 ppm. This value falls 1'lithin the <br />reCluirement of Hinute 21,,2 of the International Boundary and 'later <br />Commission that the differential be no greater than 115 ,+ 30 'ppm. <br /> <br />DUring the same period, all of the drainage re'i:.urn flo1'ls from the <br />-'ellton-Hoha\'lk Irrigation and Drainage District, 182,000 acre-feet, <br />\'lere bypassed to the Colorado TIiver beloH liorelos Dam and the Gulf <br />of California via the l'Jellton-I.loha\'Tk bypass drain*o Of this amount, <br />31,500 acre-feet vlere replaced by ground ]'later from the Yuma l'.Iesa <br />\'Tell field and ll:,8, 900 acre-feet by releases from storage, <br /> <br />Table G summarizes operations under rlinute Nos, 218, 2lfl, and <br />242 for the period 1965 through 197$0 <br /> <br />* Actually, 1,600 acre-feet of "!ellton-l"ioha\'Tlc drainage 1'later <br />vIas inadvertently released above J.1orelos Dam but "Ias not <br />charged to Mexico. <br /> <br />- 11 - <br />