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<br />i(~~5 <br /> <br />\VATER QUALITY <br /> <br />During the 1977 calendar year, the average floH-ueighted salinity <br />of the waters delivered to Nexico above Morelos Da,a \'laS 943 ppiil alld thc <br />salinity of the Colorado River \Caters \-;hich arrived at L,IPerial Da;il was <br />:120 ppln. 'rhus, the diffcrclItial bet\veeu the average salillities at <br />;I!orelos D1l..1;] and Lnperial Dam HG.S 123 ,p,.l. This value falls \",ithin the <br />requirc'ilent of IIli.mte 242 of the Ii,ternational Boundary a'ld Vlater <br />Co,ai.lission that the differential be no groater than 115,! 30 pplil. <br /> <br />During the sa..le period, all of the drainage return flmvs fro;:! <br />the \'Jellton-r.loha\'lk Project, 205,::100 acre-feet, \lOre bypasscd to the <br />Colorado River below Norelos Daiil and the Gulf of CaliforIlia via a <br />nO\'lly cO';lpleted bypass channel. ar this a,aount, 40,900 acre-feet <br />were replaced by ground \vater fro::] the YUlaa Hesa Hell field a.ld <br />165,900 acre-feet by releases fro.n storac;e. <br /> <br />Table 9 sUEaarizes operations ullder filinutes NOS. 21G, 241, allO, <br />242 for the period 1965 through 1977. <br /> <br />- 12 - <br />