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Technicians prepare to board a boat to measure water flow.

By Communications and Publishing 2017 (approx.)
two men in camo-patterned overalls standing next to a boat on the shore of a river with an instrument on the ground.
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Detailed Description

USGS technicians prepare to board a boat to go out to the center of the channel in the San Joaquin River below Friant Dam to get an accurate measurement of water flow during releases from the Dam for flood control.

Sources/Usage

Public Domain.