ABSTRACT
The Q = AV calculation estimates the theoretical velocity of flow in a channel or pipeline. Actual velocities in the pipeline can be measured by metering devices. Velocities can also be estimated by the use of a float or dye placed in the water. Then, by timing the distance traveled using a float or dye, the velocity of flow can be determined:
Velocity _. Distance, ft ft/sec - Time, sec
A float is perhaps less accurate in estimating velocities in a pipeline than use of fluorescent tracer dyes. In channels, floats move along with the faster surface waters and can be as much as 10 or 15 percent faster than the actual average flow rate. Some floats designed for use in channels include segments that extend into the water, thus responding to a moR average velocity through the channel.
