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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5. DISCHARGE-CURRENT·METER METHOD 131<br />
Waders or boots are needed when wading measurements are made.<br />
Waders should he loose fitting even after allowance has been made for<br />
heavy winter clothing. Ice creepers strapped on the shoe of boots or<br />
waders should be used on steep or icy streambanks and on rocky or<br />
smooth and slippery streambeds. (See fig. 87.)<br />
MEASUREMENT OF VELOCITY<br />
The current meter measures velocity at a point: The method of<br />
making discharge measurements at a cross section requires determination<br />
ofthe mean velocity in each ofthe selected verticals. The mean<br />
velocity in a vertical is obtained from velocity observations at many<br />
points in that vertical, but it can he approximated by making a few<br />
velocity observations and using a known relation between those ve·<br />
locities and the mean in the verticaL The more commonly used<br />
methods of determining mean vertical velocity are:<br />
FIOURE 87.-Ice creepers for boots and wadera
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