Xylem SonTek FlowTracker2 User Manual page 98

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