CHAPTER 10 - CURRENT METERS
11. Method of Measurement
Depth sounding, either with a meter and rod assembly or with a special sounding line and weight, should first be made at each of the permanent measuring points. These depths should be properly recorded. Next, the mean velocity at each of the measuring points should be determined with the current meter by one of the methods listed in the following section. Velocity measurements should be properly recorded.
Errors of velocity measurement will arise if the current meter: