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<br />DISCHARGE MEASUREMENTS AT GAGING STATIONS <br /> <br />1 <br /> <br /> <br />. <br /> <br />..0:' <br /> <br /> <br />Figure 12.-Top.setting wading rod with meter attached. <br /> <br />longer than the maximum depth of water to be <br />found in a cross section. About 12 feet is the <br />maximum practical length for an ice rod; <br />depths greater than 10 feet are usually measured <br />with a sounding weight and reel. The base <br />plate, sliding support, and lower section are not <br />used on an ice rod, Instead a special lower sec- <br />tion is screwed directly into the top of the <br />contact chamber of the '"ane ice meter. (See <br />fig, 16.) If a Price meter is used under ice cover, <br /> <br />11 <br /> <br /> <br />Figure 13.-Closeup view of setting scale on handle of <br />top.setting rod. <br /> <br />another special lower section is used to hold the <br />meter by means of the hanger screw. (See fig. <br />17.) All lower sections for ice rods now are <br />made so that the center of the vanes or cups is <br />at the O-foot point on the rod. <br /> <br />Sounding weights and accessories <br />If a stream is too deep or too swift to wade, <br />the current meter is suspended in the water <br />from a boat, bridge, or cableway. A sounding <br />weight is suspended below the current meter <br />to keep it stationary in the water. The weight <br />also preven t$ damage to the meter when the <br />assembly is lowered to the streambed. <br />The sounding weights now used are the <br />Columbus weights, commonly called the C <br />type. (See fig. 18.) The weights are streamlined <br />to offer minimum resistance to flowing water. <br />Each weight has a vertical slot and a drilled <br />horizontal hole to accommodate a weight hanger <br />and securing pin. <br />The weight hanger is attached to the end of <br />the sounding line by a connector. The current <br />