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<br />The following tabulations for calendar year 1999 show final records of releases of water <br />through regulatory structures controlled by the United states. At Hoover, Davis, Parker, <br />Palo Verde, Imperial, and Laguna Dams, the records are furnished by the U.s. Geological <br />Survey based on measurements at or below the structures. <br /> <br />The record of river flow through Headgate Rock Dam was computed using the record of flow at <br />the gaging station "Colorado River below Parker Dam, Arizona-California," and deducting from <br />it the record of flow at the gaging station "Diversions for Colorado River Indian Reservation <br />Main Canal near Parker, Arizona." The diversions are made at Headgate Rock Dam. <br /> <br />5 <br />