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<br />." <br /> <br />. <br /> <br />. <br /> <br />thing to it.) Water will be sampled for evidence of <br />tracer at the next downstream gage site and hopefully <br />at lower gage sites if dilution has not weakened the <br />signal too much. Placement and detection of the tracer <br />must be accurately timed. <br /> <br />Requirements: <br />Approval by NPS of appropr~ate tracer. <br /> <br />Placement of personnel at gage sites during constant <br />flow. <br /> <br />Availability of detection equipment for all sites <br />(e.g., fluorometer for Rhodamine). <br /> <br />C. Research From Glen Canyon Dam to Lee's Ferry <br /> <br />Access at 3-Mile Bar <br /> <br />Objectives: <br />Determine the relationship between boat access and <br />flows. <br /> <br />Justification: <br />Access by boats to the upper reach of the Colorado from <br />Lee's Ferry to the Dam is limited by various bars and <br />the amount of water flowing by them. 3-mile bar is the <br />first impediment and therefore'is used for access <br />studies to the upper reach. Future surveys at 3-mile <br />bar of the upstream movement of boats relative to flows <br />is dependent on knowing the flows at the time of <br />survey. Placement and calibration of a staff gage at <br />3-mile bar during the 5000 cfs constant flow will allow <br />for accuracy of future surveys. <br /> <br />Methods: <br />Have a reconnaissance trip prior to the constant flow <br />to determine the proper location for the staff gage. <br /> <br />Place staff gage in a permanent location, but the gage <br />must be removable to prevent vandalism. The lower part <br />of the gage must be in water at 1000 cfs and observable <br />from survey locations. <br /> <br />During the constant flow, personnel will test survey <br />and observational procedures with staff gage in <br />position, and calibrate staff gage to upstream Glen <br />Canyon Dam stream discharge gage. <br /> <br />Requirements: <br /> <br />7 <br />