<title> <META NAME="description" CONTENT="AquaCalc LLC / JBS Instruments specializes in stream flow measurement devices like the AquaCalc that are used in the field of hydrology."> <META NAME="keywords" CONTENT="jbs instruments aquacalc aquacount stream flow measurement water discharge current meter hydrology usgs"> </title>

Cost and Accuracy Comparison

The United States Geographical Service (USGS) Hydrological Instrumentation Facility (HIF) analyzed the costs and accuracy of wading, point-velocity discharge measurement technologies and equipment.


They concluded that over the 40 year life of a hydrographer, the cost of an AquaCalc used with a Pygmy and Price current meters is up to five times less than other technologies with comparable accuracy.


The analysis was conducted by Scott Kimball and presented in the WMA Instrument News, and can be downloaded here:

Cost Comparison of Wading Point Velocity Discharge Equipment By Scott Kimball, Hydrologic Technician, Hydrologic Instrumentation Facility


The following charts summarize their conclusions:

Cost Comparison

The following chart summarizes the finding of the HIF analysis. Note that the cost of the Sontek FlowTraker is the older FlowTracker 1


Cost Comparison

Comparison of Accuracy

The following chart, taken directly from the HIF analysis, shows the error band for each technology, with the observed velocity versus the actual velocity over a range of velocities. Above 1 cfs, the AquaCalc with the Pygmy current meter and the Price AA is within about 2% of actual velocity and within 1% of acoustic technologies throughout the entire range.

Current Meter Accuracy

Cost and Accuracy Comparison

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

Need Accessories or Cables?

We have replacement parts and cables for the AquaCalc line of stream flow computers including the Digital Pygmy Magnetic Head retro fit your old Pygmy Current Meter with a new digital magnetic sensor.

Find Accessories and Cables here.

Contact Us