SonTek – a Xylem brand
FlowTracker2 User’s Manual (January 2019)
80
c) The uncertainty calculations are based on several different parameters. In
addition to overall uncertainty, the FlowTracker2 also looks at the contribution of
each of the following parameters.
i). Accuracy: The accuracy of the FlowTracker2 calibration (this is generally
negligible),
ii). Depth
• In the IVE calculation, this term includes both uncertainty in the depth
measurement and the effect of changes in depth between stations,
• In the ISO calculation, this term includes only the uncertainty in depth
measurements.
iii). Velocity
• In the IVE calculation, this term includes both uncertainty in the velocity
measurement and the effect of changes in velocity between stations,
• In the ISO calculation, this term includes only the uncertainty in velocity
measurements.
iv). Width
• Estimated uncertainty in width measurements.
v). Method: Determining Mean Station Velocity.
• Use for the ISO method only.
vi). Number of stations
• Use for the ISO method only.
Under Ice Measurements 5.1.5
The discharge calculation methods discussed previously in this section are also
applicable for Under Ice Measurements. It is recommended that the operator refer to
existing literature describing under ice measurements as there are number of aspects
that need to be taken into account.
“Standard Operating Procedures for under ice discharge measurements using ADCPs”,
Water Survey of Canada, Environment Canada, is a good reference guide for
performing under ice measurements
There are a couple of additional requirements for calculating total discharge in addition to
what was discussed under Discharge Calculation Methods when performing under ice
measurements,
a) Additional measurements required during under ice measurements,
i). Ice thickness,
ii). Water surface to bottom of ice,
iii). Water surface to bottom of slush (if slush is present).
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