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The EPA is working cooperatively with the U.S. Army Corps of Engineers and other partners across the nation to develop rapid, field-based methods to classify streamflow duration.
Learn more about streamflow duration assessment methods.
Arid West: Released a beta method.
Mountain West : Developing a beta method.
Great Plains: Developing a beta method.
Northeast and Southeast: Monitoring and sampling streams.
View the most recent regional updates.
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