SonTek – a Xylem brand
FlowTracker2 User’s Manual (January 2019) 6
4.7. GPS Data ......................................................................................................... 65
4.8. Pressure Sensor (Pressure Sensor) ................................................................ 66
4.9. System Maintenance ........................................................................................ 67
Force Probe Upgrade .......................................................................................................... 67 4.9.1
Data Collection Modes .............................................................................. 69 Section 5.
5.1. Discharge Mode ............................................................................................... 69
Measurement Technique .................................................................................................... 69 5.1.1
Discharge Calculation Methods .......................................................................................... 70 5.1.2
Mid-Section Equation .......................................................................................................... 70
5.1.2.1
Mean-Section Equation ....................................................................................................... 72
5.1.2.2
Japanese Equation ............................................................................................................. 73
5.1.2.3
Determining Mean Station Velocity ..................................................................................... 75 5.1.3
Method None ....................................................................................................................... 77
5.1.3.1
Vertical Velocity Curve ........................................................................................................ 77
5.1.3.2
Correction Factor ................................................................................................................ 78
5.1.3.3
Discharge Uncertainty Calculation ...................................................................................... 79 5.1.4
Under Ice Measurements .................................................................................................... 80 5.1.5
Weighted Gauge Height ...................................................................................................... 81 5.1.6
5.2. General Mode .................................................................................................. 82
Measurement Technique .................................................................................................... 82 5.2.1
Determining Mean Velocity ................................................................................................. 82 5.2.2
Quality Control .......................................................................................... 83 Section 6.
6.1. Quality Control Parameters .............................................................................. 83
Signal to Noise Ratio (SNR) ................................................................................................ 84 6.1.1
Velocity Standard Error ....................................................................................................... 87 6.1.2
Boundary Interference ......................................................................................................... 88 6.1.3
Velocity Spike Filter ............................................................................................................. 90 6.1.4
Velocity Angle ...................................................................................................................... 91 6.1.5
Tilt Angle ............................................................................................................................. 93 6.1.6
Station Percent Discharge .................................................................................................. 93 6.1.7
Station Water Depth ............................................................................................................ 94 6.1.8
Station Location................................................................................................................... 95 6.1.9
Velocity Profile 0.2 \ 0.8 ...................................................................................................... 96 6.1.10
6.2. Quality Control Warning Messages .................................................................. 96
Types of Warning Messages ............................................................................................... 96 6.2.1
Timing of Warning Messages .............................................................................................. 98 6.2.2
6.3. Beam Check..................................................................................................... 98
Beam Check Overview ........................................................................................................ 99 6.3.1
Beam Check Features ...................................................................................................... 100 6.3.2
Beam Check Operation ..................................................................................................... 101 6.3.3
Diagnosing Measurements with Beam Check .................................................................. 101 6.3.4
Low Scattering Strength .................................................................................................... 101
6.3.4.1
Strong Scattering Strength ................................................................................................ 101
6.3.4.2
Boundary Detected within Beam Check ........................................................................... 102
6.3.4.3
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