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Hydrologic technician classifies streambed particles into size classes

By Oregon Water Science Center
female reaches below river water to grab a rock to measure. Shallow water partly lit by sun, mossy rocks & greenery on banks
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Detailed Description

USGS hydrologic technician uses a ruler called a gravelometer to classify streambed particles into size classes. These data can be used to calibrate models of streambed sediment. 

Sources/Usage

Public Domain.

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