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<br />" <br /> <br />o <br />~ <br />o <br />~ <br /> <br />Cover photo~mp~: an aerial view of Imperial Dam. The view is looking upstream (north). <br />Imperial Dam is the last diversion point where Colomdo River water is taken by water users in <br />the United States~o 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 water is used <br />for agricultural, i~dustrial, and municipal purposes in Mexico. This water which passes Imperia1 <br />Dam, plus additional water coming into the river as return flows below Imperial Dam and water <br />pumped across th~ border at San Luis, provide the quantity of water guaranteed to Mexico as <br />set forth in the trel1ty between the two countries. <br /> <br /> <br />Imperial Dam is t4e point at which water quality samples are taken to ensure that the numeric <br />criteria of water q*ality 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 idetermine water quality as provided for by the amended treaty with Mexico.. <br />When the total di~solved solid values at Imperial Dam are subtracted from values at the <br />downstream measu\:ing point at Morelos Dam, a differential is calculated. The differential, as <br />explained in this r~rt, is the basis for the water quality agreement between the United States <br />and Mexico which 1ed to an amendment to the treaty. <br /> <br />, <br /> <br /> <br />, i <br />