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I’ve watched the technicians calabtprate the system by first measuring the profile on the stream, determine velocity and measuring the level. I would imagine there is some type of calculation applied. As the levels change, so does calculated flow rate. However, and don’t you must love howevers. 1) this assumes stream contour remains the same. Over winter, depending on ice formation, stream contours may change. 2) the level device must be free to move. Ice impedes level device. As most of these stream flow samplers are located tight to the stream, ice would take som time to disappear. Tbe takeaway, use the information as an ABOUT flow and not exact. Don