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<br />DISCHARGE MEASUREMENTS AT GAGING STATIONS <br /> <br />15 <br /> <br /> <br />Figure 21.-CanField reE:l. Photograph by permission of Leupold and Stevens Instruments, Inc. <br /> <br />stainless-steel indicator is less than 3 inches in <br />diameter and has nylon bushings which do not <br />require oiL The main dial is graduated in feet <br />and tenths of a foot from 0 to 10 feet. The <br />depth is indicated by a pointer. Tens of feet <br />are read on a numbered inner dial through an <br />aperture near the top of the main dial. <br />The main dial has a graduated spiral to indi. <br />cate directly the 0.8-depth position (see p. <br />32) for depths up to 30 feet. <br />The A-pack and Canfield reels are equipped <br />with counters for indicating depths. (See figs. <br />20 and 21.) <br /> <br />Power unit <br /> <br />A power unit is available for the B-56 and <br />E-53 reels to raise and lower the sounding <br />weight and meter. (See fig. 26.) The power <br /> <br />unit can be used with 6-, 12-, 18-, or 24-volt <br />batteries. <br /> <br />Handlines <br />Handlines are devices used for ma.king dis- <br />charge measurements from bridges using a 15- <br />or 30-pound sounding weight. (See fig. 27.) <br />The advantages of the handline are that it is <br />easily set up, that it eliminates the use of a <br />sounding reel and supporting equipment, and <br />that it reduces the difficulty in ma.king measure- <br />ments from bridges which have interfering <br />members. The disadvantages of the handline <br />are that there is a greater possibility of making <br />errors in determining depth because of slippage <br />of the handline or measuring scale or tape and <br />that it requires more physical exertion especi- <br />"Uy in deep streams. Handlines can be used <br />