SonTek – a Xylem brand
FlowTracker2 User’s Manual (January 2019)
113
k) Determining Mean Station Velocity method for each station. The software
suggests either a six-tenths or two-point method depending on the threshold in
0.6 Method Depth and the measured water depth. The minimum distance
between the channel bed and water surface and instrument must be within the
instrument specifications.
l) The FlowTracker2 must be perpendicular to the graduated tagline or measuring
tape that was setup across the measurement section.
Figure 7:1 - FlowTracker2 Probe Orientation Relative to Stream Flow
m) Keep the FlowTracker2 probe free of plant material at all times as this can impact
the velocity measurements significantly.
n) Continuously evaluate the measurement results with measurements performed at
previous stations. The variation in measurement results should reflect the flow
conditions at the measurement site.
o) Review the instrument configuration during the measurement, especially the
quality control parameters and adjust if required.
p) Automated Beam Check can be performed during any stage of the measurement
to verify the probe performance and measurement conditions.
q) Comments can be entered at each station or at the end of the discharge
measurement to describe the flow conditions or any influences that may impact
the measurement quality.
r) Staff gauge reading with time should be taken at the end of the discharge
measurement.
7.5. Post Measurement Requirements
Post Measurement Requirements consist of number of tasks that need to be
performed when a field measurement is completed. The tasks that form the framework
of the post measurement requirements are grouped under the following main categories,
• Review of Measurement Site Information,
• Review Measurement Summary
• Data Management,
Sampling
Volume
Y
X
Probe
Coordinate System
Graduated Tag Line
Primary Flow
Direction
Mounting
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