[Note: this is an internal working document of a USGS-SFSU collaboration. Data, analysis and results herin should not be considered as final or accurate. Final results will be presented in print.]
Discharge Errors
due to
Uncertainties in the Rating Curve
( references |Delta Discharge |Rating Curves |Gaussian rating curve )

The UVM velocity can be used to determine discharge if it is calibrated by ADCP measurements of the full vector velocity distribution. This leads to a rating curve, showing the mean channel velocity as a function of UVM velocity. Here we discuss the rating curves from three different calibrations. We have fit a model for the rating curve to these three data sets. We discuss the variation of the daily discharge calculated from the different rating curves. We use this to estimate the error on the discharge due to the uncertainty in the calibration.

Click on image for blowup
Gaussian-Bulge Model of the Rating Curve Parameters from Rating-Curve Fits Effect of Various Biases