PCWA-L 467.pdf - PCWA Middle Fork American River Project ...

160 MEASUREMENT OF STAGE AND DISCHARGE
The air correction for even-numbered angles between rand 36'
and for vertical lengths between 10 and 100 ft is shown in table 5. The
correction is applied to the nearest tenth of a foot; hundredths are
given to aid in interpolation. Table 6 is a similar table in metric units.
The air correction may be nearly eliminated by using tags at
Flow
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Apex of vertical angle
in sounding line
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!Streambed
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Water surface
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FIGURE 99.-Position of sounding weight and line in deep, swift water.
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