Because it is adaptable to most measuring conditions Because it is designed to measure surface velocities in open channels without being immersed Because it can be used in velocities that are too high to be measured by a conventional current meter . The round rod top-setting rod sectional rod is appreciated because it can easily be positioned at the proper depths. Handlines are usually used from cableways bridges boats . Sonic sounders are advantageous in swift debris-laden streams because they don't need to be lowered to the streambed and starts recording the depth as soon as it is in the water their accuracy is not influenced by the debris they are not damaged by debris . The safety of both sitdown and standup cableways needs to be assessed prior to each use only after major floods once every three years .
Current meters measure velocity at a point, but what is more important is the mean velocity.
Mean velocity is the number needed by fishermen and rafters . The difference total average of those two observations is taken as the mean velocity in the vertical. To obtain the mean velocity in the vertical, a shift depth correction coefficient should normally be applied to the observed velocity. Press this button when you are ready to submit the .