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Current Meter Maintenance Information and Resources

The AquaCalc is used with echanical Current Meters like the USGS style Price AA and Pygmy current meters. These current meters most often use a contact switch to indicate a revolution of the cups. In modern current meters this is most likely a magnetic reed switcch, but in older current meters this can be a small wire, often called a “cat whisker” that touches a rotating cam in the current meter switch head. AquaCalc also makes a Pygmy Digital Magnetic Head for the Pygmy current meter. This magnetic sensor uses a Hall Effect sensor, and is designed to work with AquaCalc.




Some of these resources are old, but still good.

I have attached a paper on current meter maintenance, and a manual for a Price AA current meter made by Rickly Hydrological.

The USGS has an educational site that discusses discharge measurement in broad terms here:


The USGS has more detailed training materials and a report on Discharge Measurements here:


(The whole report can be downloaded here:

https://pubs.usgs.gov/twri/twri3a8/pdf/TWRI_3-A8.pdf )

And finally the old “bible” of the USGS Water Supply Division: “Water Supply Papers 2175 - Measurement and Computation of Streamflow”. This has a lot of information and theory:




Current Meter Resources

AquaCalc LLC. telephone +1.916.372.0534 e-mail: sales@aquacalc.com