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<br />e. <br />A.. <br />o <br />4....1: <br /> <br />Cover photograpq: an aerial view of Imperial Dam, The view is looking lipstream (north), . <br />Imperial Dam is. the last diversion point where Colorado River water is taken by.water. users in. <br />the United States 'to be used both to the east (the right) in Arizona and to the west (the left) In <br />California, Water passing over Imperial Dam continues on to Mexico where the watetis ustld <br />for agricultural, il1dustrial, and municipal purposes in Mexico, This water which passes Imperial <br />Dam, plus additional water coming into the riverasreturnflows below Imperial Dam and water <br />pumped acrossth~ border at San Luis, provide the quantity of water guaranteed to Mexico as . <br />set forth in the trcttty between the two countries, <br /> <br />Imperial Dam is tbe point at which water quality. samples are taken to ensure that the numeric <br />criteria of water q\1ality standards, adopted by the seven Colorado River Basin states for water <br />used in the United States, are being maintained. Imperial Dam is also used as the upstream <br />measuring point to:determine water quality .as provided for by the amended treaty with Mexico, <br />When the total di~solved solid yalues. at Imperial Dam. are subtracted from values at the. . <br />downstream measuring point at Morelos Dam, a differential is calculated, The differential, as <br />explained in this rQport, is the basis for the water quality agreement between the United States <br />and Mexico which led to an amendment to the treaty, . <br /> <br />, <br /> <br /> <br /> <br /> <br /> <br />l~: <br />~.t <br />