It looks like you are coming from United States, but the current site you have selected to visit is Australia. Do you want to change sites?

Yes, please. No. Keep me on the current site.

  • Flow Monitoring

    Get precise flow data in any lake, stream and river

    Learn More

  • rQPOD Remote Survey Boat

    A lightweight, portable solution for
    conducting and recording water surveys.

    Learn More

  • SonTek-SL Doppler Current Meter

    A simple way to measure water velocity
    and level in open channels.

    Learn More

  • SonTek-IQ Series

    Ideal for monitoring flows in canals, culverts,
    pipes and natural streams.

    Learn More


CastAway-CTD Lesson Plan


CastAway-CTD lesson plan and study guide are available.


Training on Demand


Collecting Acoustic Stationary & Moving Boat Discharge Data 


Watch & Learn Video Series


GPS positioning for RiverSurveyor Stationary Live Measurements


Stay informed

When you sign-up for eNews, you will be first to know about cool new product updates and releases, have the opportunity to gain insight from other water monitoring professionals who are using acoustics as part of their data collection programs, and hear about important training events that might help improve your knowledge of SonTek instrumentation.


Case Studies & White Papers

Principles of Extrapolation and Screening of Velocity Profiles

A Webinar by Senior Hydrologist Daniel Wagenaar

SonTek Webinar Extrapolation and Screening of Velocity Profile Measurements

The extrapolation and screening of velocity profile measurements from Acoustic Doppler Current Profiler instruments are essential aspects of the measurement process. It is important to understand the fundamental principles of velocity profiles within a channel and the reason why the extrapolation process can have substantial impact on the final discharge calculation.

Key discussion points include:

  • Velocity Profile Principles
  • Extrapolation of Velocity Profiles
  • Implementation of Screening Distance
  • RSL (SonTek): RiverSurveyor Live Software (SonTek)
  • QRev (USGS): Software for Computation and Quality Assurance of Acoustic Doppler Current Profiler Moving-Boat Streamflow Measurements

Watch Recording   Download Presentation