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Special Joint Public Notice

USACE & EPA
Published April 13, 2023

USACE Districts (listed in attachment) and EPA Regions jointly announce 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.” More details are available in the attached document. Written comments may be submitted via email to USACE.SDAM.NESE@usace.army.mil