Xylem SonTek FlowTracker2 - Page 98

SonTek – a Xylem brand
FlowTracker2 User’s Manual (January 2019)
97
Warning Reporting QC Criteria Description Suggested Action
highly aerated environment.
sources (e.g., aerated
water).
SNR
Threshold
Variation
Point
Velocity
SNR
Threshold
SNR more than SNR Threshold
different from previous
measurements; major change in
measurement conditions.
• Look for underwater
obstacles or other
changes in river
condition.
• Repeat measurement
Standard
Error > QC
Point
Velocity
σV
Threshold
σV > σV Threshold; adjusted
based on previous data and
measured velocity. May indicate
interference or a highly turbulent
environment.
• Look for underwater
obstacles or a change
in conditions.
• Consider real
turbulence levels in
river.
• Repeat measurement.
Boundary
Interference
Point
Velocity
Boundary
Interference
Boundary QC is FAIR or POOR.
Indicates possible interference
from underwater obstacles.
• Consider re-locating
probe and repeating
test.
• Measurement can
proceed if results are
consistent.
High %
Spikes
Point
Velocity
Spike
Threshold
Spikes > Spike Threshold
percent of samples. May indicate
poor measurement conditions.
• Look for underwater
obstacles or unusual
conditions (e.g.,
aerated water).
• Repeat measurement.
Velocity
Angle > QC
Point
Velocity
Max Velocity
Angle
Angle > Max Velocity Angle.
May only indicate non-ideal
measurement environment.
• Consider if measured
angle is realistic.
• Repeat measurement if
needed.
Rod Angle
> QC
Point
Velocity
Max Wading
Rod Angle
Angle > Max Wading Rod
Angle. May indicate non-ideal
measurement method.
• Consider if measured
angle is realistic.
• Repeat measurement if
needed.
High Stn %
Discharge
Station
Max Station
Discharge
%Q > Max Station Discharge.
Station contains a large portion of
the total discharge.
• Consider adding more
stations.
Water
Depth > QC
Station
Max Depth
Change
Station depth differs from
adjacent stations by more than
Max Depth Change %. This may
indicate data entry problem.
• Verify station depth
value.
• Re-enter if needed.
Stn
Spacing >
QC
Station
Max
Spacing
Change
Spacing between stations has
changed by more than Max
Spacing Change %. This may
indicate a data entry problem.
• Verify station location
value.
• Re-enter if needed.
Station
Order
Station None
Station location out of sequence
or outside river edge. This may
indicate a data entry problem.
• Verify station location
value.
• Re-enter if needed.
Location
Outside
Edge
Station None
Station location out of sequence
or outside river edge. This may
indicate a data entry problem.
• Verify station location
value.
• Re-enter if needed.