SonTek – a Xylem brand
FlowTracker2 User’s Manual (January 2019)
95
Station Location 6.1.9
The Max Spacing Change criterion (default 100%) is intended to avoid data entry
errors.
a) It is assumed that the spacing of adjacent stations will be nearly constant across
the river.
Max
Station
Evaluate
b) If spacing between stations has changed by more than Max Spacing Change,
an alert is issued to be sure the location was not incorrectly entered. A 100%
Max Spacing Change means the new station spacing is more than two times
the previous station spacing.
i). Determine if the station location trend is expected to be increasing or
decreasing by comparing the location of the first two stations. All stations are
expected to match this trend.
ii). Any time a station location is changed, the location is compared to adjacent
value(s) to see if the station is out of order.
• If the trend in location from the previous station to this station does not
match the expected trend, then give the Station Order warning.
• If the trend in location from this station to the next station does not match
the expected trend, then give the Station Order warning.
• Collecting an out-of-order station is allowed. However, when an out-of-
order station is entered we verify the location value since the station is
sorted into the correct place within the stream.
iii). Any time a station location is changed, the location is compared to the starting
edge location. If the new location is outside the starting edge, a Location
Outside Edge warning is given.
iv). Max Station Change is checked during station configuration (see Timing of
Warning Messages).
• User is notified of any stations that exceed the Max Station Change
criterion.
• User is prompted to verify the location value or re-enter the location.
c) The expected station spacing is computed from the previous two station locations.
If the station spacing from the previous station to this location is more than Max
Spacing Change percent of the expected station spacing, then give the Stn
Spacing > QC warning. A warning will be triggered only if the station spacing is
too big (there is no warning that it is too small).
d) The station location check is re-run (only for Discharge mode) to ensure the
warnings are set with the most current data.
e) Max Spacing Change is active only in Discharge data collection mode.
f) This criterion can be adjusted or disabled under Discharge Settings.
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