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Measuring streamflow in fast moving floodwater.

By Communications and Publishing 2017 (approx.)
man in yellow slicker standing in rushing river up to his thighs, holding a stick-like instrument in the water
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Detailed Description

USGS hydrographer measuring streamflow using a handheld Acoustic Doppler Velocimeter in fast moving floodwater Cajon Creek near Keenbrook, California. 

Sources/Usage

Public Domain.