SonTek, a Xylem brand
RiverSurveyor S5/M9 System Manual (February 2013)
143
• Velocity
o In the Statistical calculation, this term includes both uncertainty in the velocity
measurement and the effect of changes in velocity between stations.
o In the ISO calculation, this term includes only the uncertainty in velocity meas-
urements.
• Width: estimated uncertainty in width measurements.
• Method: estimated uncertainty from not measuring velocity throughout the entire water col-
umn (velocity near the surface and bottom must be estimated).
o Used for the ISO calculation only.
• Number of stations: estimated uncertainty from measuring velocity and depth at a limited
number of locations across the river.
o Used for the ISO calculation only.
The Discharge Measurement Report shows both uncertainty calculations and the contribution of
each parameter to the overall uncertainty.
To Next Page
Loading...
