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Special Public Notice - Availability of Beta SDAMs for the Northeast and Southeast

Published April 12, 2023
Expiration date: 5/12/2023

This is a Special Public Notice announcing the availability of the Beta Streamflow Duration Assessment Methods (SDAM) for the Northeast and Southeast (dated April 12, 2023). The methods are rapid assessment tools to help distinguish between ephemeral, intermittent, and perennial streamflow at the reach scale for the Northeast and Southeast SDAM Regions. The beta SDAMs may help provide technical guidance for identifying waters that may be subject to regulatory jurisdiction under Section 404 of the Clean Water Act; however, these methods do not alter or change the definition of “Waters of the U.S.”


The agencies are making these beta SDAMs available for a one year preliminary implementation and comment period to inform the development of final SDAMs for the Northeast and Southeast.