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EPA and the Corps have jointly released the beta Streamflow Duration Assessment Methods for the Northeast and Southeast (beta SDAMs NESE) today, April 12, 2023. The agencies are making these beta SDAMs NESE available for a one-year preliminary implementation period through joint Public Notice to inform the development of a final SDAMs NESE in 2024. Geographic applicability of the method includes portions of 31 states in seven EPA Regions and 26 Corps Districts (https://www.epa.gov/streamflow-duration-assessment/streamflow-duration-assessment-method-sdam-status-region). Method development was guided by a Regional Steering Committee (RSC), including staff from EPA Regions, EPA HQ, Corps Districts, Corps HQ, and Corps ERDC. The beta SDAMs NESE result from a multi-year study conducted at 336 stream reaches across the Northeast and Southeast, following the process described in Fritz et al. (2020). Ninety-seven candidate indicators were evaluated and considered for applicability in the NE and SE. Through statistical analyses a subset of indicators with the highest diagnostic accuracy for flow duration classification were identified, which were used to construct the current data-driven methods. Two beta SDAMs were developed and the Caribbean study reaches were not used in the development of the beta SDAM for the Southeast due to increased accuracy when creating separate methods as well as differences in climate and a relatively small number of study reaches in the U. S. Caribbean. The beta SDAM for the Northeast uses eight indicators, while the beta SDAM for the Southeast uses seven indicators.
The development of the beta SDAMs NESE is possible through the dedication of the project delivery team (Brian Topping OWOW , Tracie Nadeau R10/OWOW, Ken Fritz ORD, and Rachel Fertik Edgerton OWOW, and Kristina Nicholas ORISE OWOW), contractors under NARS and WARTS task orders, and the many members of the National and Northeast and Southeast Regional Steering Committees (Tunis McElwain Corps HQ, Gabrielle David Corps ERDC, Matt Wilson Corps HQ and Rose Kwok OWOW, Ray Putnam of R1, Stephanie Andreescu of R2, Christine Mazzarella of R3, Eric Somerville of R4, Kacy Sable of R4, Melanie Burdick of R5, Chelsey Sherwood of R6, Justin Kensinger of R7, Matthew Gilbert of the Baltimore District, Peter Krakowiak of the Buffalo District, Jeremy Kinney of the Charleston District, Andrew Blackburn of the Chicago District, Sabrina Miller of the Detroit District, Joseph Shelnutt of the Fort Worth District, Mark Pattillo of the Galveston District, Wes Barnett of the Huntington District, Jessica Cordwell of the Jacksonville District, Ryan Langer of the Kansas City District, David Rupe of the Little Rock District, Patricia Grace-Jarrett of the Louisville District, Russell Retherford of the Louisville District, Roger Allan of the Memphis District, Mike Moxey of the Mobile District, Aric Payne of the Nashville District, Taylor Bell of the New England District, Jon Barmore of the New Orleans District, Tom Bruno of the New York District, Jeanne Richardson of the Norfolk District, Mike Leggiero of the Philadelphia District, Alyssa Barkley of the Pittsburgh District, Justin Hammonds of the Savannah District, Chad Lamontagne of the St. Louis District, Rob Hoffman of the Tulsa District, Bryton Hixson of the Vicksburg District, Tyler Crumbley of the Wilmington District).
The beta SDAMs NESE results from our larger effort to develop regional SDAMs to provide nationwide coverage; it is the fifth regional SDAM to be released (final SDAM for the Pacific Northwest released in 2015; beta SDAM for the Arid West released in March 2021, beta SDAM for the Western Mountains released in December 2021, and beta SDAM for the Great Plains released in September 2022). The development of final SDAMs for the coterminous US is planned for 2023 and 2024.