PCWA-L 467.pdf - PCWA Middle Fork American River Project ...
PCWA-L 467.pdf - PCWA Middle Fork American River Project ...
PCWA-L 467.pdf - PCWA Middle Fork American River Project ...
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124 MEASUREMENT OF STAGE AND DISCHARGE<br />
ICE EQUIPMENT<br />
Current-meter measurements made under ice cover require special<br />
equipment for cutting holes in the ice through which to suspend the<br />
meter.<br />
Cutting holes through the ice on streams to make discharge measurements<br />
has long been a laborious and time-consuming job. The<br />
development ofpower ice drills, however, has eliminated many ofthe<br />
difficulties and has reduced considerably the time required to cut the<br />
holes. Holes are often cut with a commercial ice drill that cuts a 6-in<br />
(O.l5-m) diameter hole (fig, 83), The drill weighs about 30 Ib (13.6<br />
FIGURE SO.-Vertical-axis boat tag-line reel (when in use the axis of the reel is verttcan
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