Xylem SonTek FlowTracker2, User Manual

Page: 94 / 308

SonTek – a Xylem brand
FlowTracker2 User’s Manual (January 2019)
93
Tilt Angle 6.1.6
The Tilt Angle quality control is applied to each point velocity measurements in both
General mode and Discharge mode
a) A good measurement will typically show variations in wading rod angle, but with
all angles less than about 5
°
.
Tilt
Method
b) Tilt angle is defined as the angle of the wading rod relative to the vertical.
i). The tilt angle of 0
°
means that the wading rod is vertical.
ii). The tilt angle is only an indicator and not used in any calculations
Tilt
Evaluate
c) If the wading rod angle exceeds Max Wading Rod Angle , a warning is issued;
you are prompted to realign the wading rod.
i). When measured angle is greater than Max Angle , a warning is given.
•
Evaluate the measurement to verify the measured angle is reasonable.
•
Consider repeating the measurement if the angle does not appear
reasonable (perhaps after moving probe location).
ii). The Max Wading Rod Angle is checked with the completion of a point
velocity measurement and measurement section (see Timing of Warning
Messages) .
•
User is notified of any point velocity measurement that exceeds the above
criteria.
•
If desired, user can go back and delete suspect point velocity
measurement and repeat the measurements.
d) The tilt angle is checked at the end of every point velocity measurement and if the
wading rod angle > Max Wading Rod Angle , then give the Velocity Angle > QC
warning.
e) The tilt angle is checked at the end of a section and reports the stations where the
tilt angle exceeds Max Wading Rod Angle .
f) This criterion can be adjusted or disabled under Discharge Settings .
Station Percent Discharge 6.1.7
Most agencies that perform discharge measurements expect that no individual station
should contain more than a certain percentage of the total discharge. The
Max Station
Q criterion (default 10%) alerts you if this standard is exceeded.
% Stn Q
Method
a) The user can set the discharge reference to either “rated” or “measured”. The
reference is used when computing the discharge percent to display. When the
discharge percent is calculated,
i). The rated discharge is used only at the end of each station,
ii). The measured discharge is used only at the end of a section.