How to Measure ADCP Transducer Depth

In this short video, Isaac Jones, Application Engineer at SonTek, walks you through two quick and effective methods for measuring your ADCP transducer depth in the field—an essential step for ensuring accurate flow measurements.

Read the full technical paper "Understanding the Importance of Transducer Depth".

Incorrect transducer depth can lead to significant errors in discharge calculations, especially when flow is extrapolated near the boundaries of the channel. Isaac demonstrates how to avoid this by using two simple approaches:

Method 1: Use a carpenter’s square to measure from the vertical beam to the waterline.
Method 2: Measure the well depth with and without your ADCP, then add the two values together.

These tips apply to instruments like the SonTek-RS5 and M9, and are perfect for field users looking to improve the accuracy of their data collection.

Pro Tip: Always input your correct transducer depth during setup—this ensures you’re getting the most reliable discharge data possible.