Index-Velocity Rating Development. Streamflow Record Computation using ADVMs and Index Velocity Methods Office of Surface Water. Goals for This Presentation. Provide an overview of the next steps in rating development: Make Q measurements over range of conditions
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Streamflow Record Computation using ADVMs and Index Velocity Methods
Office of Surface Water
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2009 flood on the Red River at Grand Forks, ND
Vmean = Q / Rated Area from Standard X-Section
NOTVmean output in your ADCP software
A relatively “flat” velocity profile --change in position of mean velocity with respect to the instrument is insignificant
Note that for the flatter profile, measuring any place between positions A and B, the difference between measured and mean velocity could be negligible – whereas the difference is significant with the more curved profile