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Appendix D — SOP for Stream Flow Measurement — Hansen Project 16 <br />13. Lower the meter to the required depth and record the observation depth in the logbook. The <br />observation depth as a fraction of total depth is usually 0.6, or 0.5 for subsections having depth of <br />less than 0.3 feet. <br />14. Stand downstream of the meter with the arm fully extended as you hold the wading rod. Position <br />yourself so that the angle measured between the arm and the tagline is about 45 degrees. Stand as <br />far away from the vertically held wading rod as possible. <br />15. Start the stopwatch and begin counting clicks. The first click is counted as zero. <br />16. After at least 40 but as much as 70 seconds have passed, stop the stop watch. Record number of <br />seconds and number of revolutions (clicks) on the same line of the note as the depth was recorded. <br />17. Determine velocity as a function of elapsed time and number of revolutions from the velocity chart <br />record velocity next to the other values for this station. <br />18. Proceed to the next station. Record the distance from the initial point to the station. Repeat <br />measurements of depth and velocity. Continue in this manner across the stream. <br />19. After recording the distance measurement at the last station, record the time at which the ending <br />edge of water is reached as "RL (or RR) FINISH 1330 ". <br />20. Note velocity and depth at the edge of water as zero. <br />21. Following velocity-depth measurements, use the staff gage again to measure and record the gage <br />height to the nearest 0.02 feet. <br />22. Evaluate and record on the data collection note the following: Flow characteristics, weather, air <br />temperature, water temperature, barometric pressure, observer(s), type of meter, and remarks. <br />4153A.140129 Whetstone Associates <br />