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<br />001573 <br /> <br />PROJECT TITLE: Evaluation of Remote Video Stream-Gaging Equipment <br />(fig. 10) <br /> <br />COOPERATING AGENCIES: None <br /> <br />PROJECT CHIEF: Larry L. Jones, District Office, Lakewood <br /> <br />PERIOD OF PROJECT: June 1980 to October 1981 <br /> <br />~oblem.--Streamflow monitoring in arid and semiarid basins is often compli- <br />cated by flash floods. The flow cannot be measured accurately because the dis- <br />charge and stage vary extremely rapidly and the water contains huge amounts of <br />salt and debris. <br /> <br />Objeatives.--Collect remote video data (surface velocitites of floating ob- <br />jects recorded and timed on film) at U.S. Geological Survey stream-gaging station <br />06720500, South Platte River at Henderson, Colo. Evaluate the data after 1 year <br />to determine if the technique is worth further study. <br /> <br />Approaah.--Process tapes of film segments by using a video-tape reader with <br />stop action and a TV monitor. Calculate the average surface velocity of an object <br />during a 3-minute run. Analyze and compare the results with "ground truth" <br />obtained from continuous streamflow records collected at the same site. <br /> <br />Progress.--After a test at Henderson, the video equipment was temporarily <br />transferred to gaging station 06719505 on Clear Creek at Golden, Colo. The Golden <br />site more nearly meets the stream-size I imitations of the equipment. The site <br />also provides a more stable streambed, which is essential for the development of <br />velocity curves and profiles. These data are used in relating surface velocities <br />to total discharge. <br /> <br />Plans.--Reinstall the video equipment at Golden prior to the spring runoff. <br />Collect video data and plot velocity curves. Analyze and report results. <br /> <br />29 <br />