The Fundamentals of Velocity Indexing Technique

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Velocity Indexing (VI) is critical advantage to have in your skillset when measuring flow, discharge, and total volume. This technique is used by agencies like the United States Geological Survey (USGS) and many other local, state and federal environmental agencies who need to regularly collect flow data.

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But are you one of those scratching your head in confusion when the topic of velocity indexing comes up? You are not alone – it is a complex subject matter – and SonTek is here to help! Get a Quote or Ask a Question!

Any of these situations seem familiar?

• You already use a current meter or ADCP to calibrate a stage-discharge curve, but you are not familiar with the idea of adding velocity to the equation. • You already have an ADVM (like the SonTek-IQ), but you haven’t been checking or rating it methodically. • You have lingering questions about acoustic instruments and their accuracy • You have a monitoring site that has been tricky to get good readings at.

Well, if you have questions about Velocity Indexing, we have answers! Join Senior Hydrologist Daniel Wagenaar, and Product Manager/Technical Specialist Janice Landsfeld, as they provide an introductory overview of the velocity index technique and its use with acoustic Doppler instrumentation.

Chinh Ha
almost 4 years agoMarch 30, 2015
Dear Sir,

I like the Fundamentals of Velocity Indexing technique. 

Could you please send the document to me?

Thanks and best regards,

Ha Chinh
Dion Webster
about 1 year agoOctober 29, 2017
I was told that the best method for collecting data is to collect multiple transects in the same location.  The implied idea is that you can take multiple measurements and average them out. If so, is there any tutorial or instruction on how i would go about this? Also when using the M9 and base station in locations with multipath interfering with gps accuracy, how would I account for these accuracy issues when comparing?
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