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Chad Reese and Sean Lawlor measuring channel width

Detailed Description

Chad Reese and Chuck Parrett of the Wyoming-Montana Water Science Center measure channel width for a small stream near Helena, Montana. Streams of this size are often measured using an instrument called a flume designed to constrain all flow to an artificial channel with a known mathematical relationship between water level and streamflow. If water is flowing, we're telling you how much -- regardless of size.


Public Domain.