Beta SDAMs
The beta Streamflow Duration Assessment Methods (SDAMs) for the Northeast and Southeast are the current SDAMs available for these regions. The EPA and the Corps anticipate release of a final Regional SDAM for the Northeast and Southeast in early 2025. Links to the User Manual for a beta SDAMs for the Northeast and Southeast, the online SDAM Web Application, and other relevant data and information are below.
This page provides information on all other beta Regional SDAMs for reference only, as they are superseded by the final Regional SDAMs. After additional data collection and analysis, agency and user feedback, the beta methods were replaced with final Regional SDAMs, resulting in somewhat different indicators from the beta methods. Watch this webinar presentation to learn more about the five regional beta methods (scroll down to the April 2023 webinar titled "Development of Rapid Streamflow Duration Assessment Methods for Nationwide Coverage").
For more information on the development or application of the final Regional SDAMs, please refer to the EPA’s Regional SDAM website.
Beta SDAMs on this page:
- Updated User Manual for a Beta Streamflow Duration Assessment Methods for the Northeast and Southeast of the United States (pdf) (8.7 MB, November 2023, EPA-843-B-23001)
- Updated Development and Evaluation of the Beta Streamflow Duration Assessment Methods for the Northeast and Southeast (pdf) (4.5 MB, November 2023, EPA-843-R-23003)
- Updated Online Web Application – an electronic application to obtain a streamflow duration classification based on user-submitted data; also provides users the option to generate a report of their results.
- Data used to develop the beta SDAMs for the Northeast and Southeast.
- Joint Public Notice announcing availability of the beta SDAM for the Northeast and Southeast (pdf) (259.1 KB, April 2023)
- Review of Flow Duration Methods and Indicators of Flow Duration in the Scientific Literature: Northeast and Southeast of the United States (pdf) (3.9 MB, March 2022, EPA-840-B-22007)
- Survey 123 templates and instructions for creating your own survey for data collection to support the application of the beta Northeast and Southeast SDAMs.
- Beta SDAMs for the Northeast and Southeast field forms
Pacific Northwest
- 2009 Interim Streamflow Duration Assessment Method for Oregon (pdf) (5.4 MB, March 2009) (for archival reference only)
- Data Used to Develop the SDAM for the Pacific Northwest. United States Environmental Protection Agency (2022). HydroShare.
- Journal Article Describing the Development of the SDAM for the Pacific Northwest.
- Xerces Society - Macroinvertebrate Indicators of Stream Flow Duration OR, WA & ID - A Field Guide
- Using Aquatic Macroinvertebrates as Indicators of Streamflow (Oregon)
- Updated November 2023 User Manual for the Beta SDAM for the Arid West (pdf) (6.3 MB, November 2023, EPA-800-K-21001)
- Updated November 2023 Field Forms for the Beta SDAM for the Arid West (pdf) (318.3 KB, November 2023)
- Joint Public Notice of Availability for the beta SDAM for the Arid West
- Updated November 2023 Online Report Generating Tool – an optional electronic application that allows users to input SDAM for the Arid West data to generate a report of their results.
- Data Used to Develop the beta SDAM for the Arid West
- Journal Article Describing the Development of the beta SDAM for the Arid West
- Correction Notice for Development of the beta Streamflow Duration Assessment Method for the Arid West (pdf) (98.4 KB, November 2023, EPA‐800‐K‐21001)
- Review of Flow Duration Methods and Indicators of Flow Duration in the Scientific Literature: Arid Southwest (pdf) (3.9 MB, January 2019, SCCWRP Tech Report 1063
- Updated November 2023 User Manual for the Beta Streamflow Duration Assessment Method for the Western Mountains (pdf) (13.8 MB, November 2023)
- Updated November 2023 Field Forms for the Beta Streamflow Duration Assessment Method for the Western Mountains (pdf) (368.8 KB)
- Updated Development and Evaluation of the Beta Streamflow Duration Assessment Method (SDAM) for the Western Mountains (WM) -Data Supplement (pdf) (2 MB, May 2022, EPA-840-R-22002)
- Data Used to Develop the beta SDAM for the Western Mountains
- Updated Online Web Application – an electronic application to obtain a streamflow duration classification based on user-submitted data; also provides users the option to generate a report of their results.
- Joint Public Notice of Availability of the Western Mountains Streamflow Duration Assessment Method for the Western Mountains (pdf) (121.8 KB, December 15, 2021)
- Review of Flow Duration Methods and Indicators of Flow Duration in the Scientific Literature: Western Mountains (pdf) (3.0 MB, September 2021, SCCWRP Tech Report 1222)
- Updated User Manual for a Beta Streamflow Duration Assessment Method for the Great Plains of the United States (pdf) (3.6 MB, November 2023, EPA-840-B-22009)
- Field form Beta Streamflow Duration Assessment Method for the Great Plains updated November 2023 (pdf) (293.2 KB, November 2023)
- Updated Development and Evaluation of the Beta Streamflow Duration Assessment Method (SDAM) for the Great Plains (GP) (pdf) (2.6 MB, November 2023, EPA 840‐R‐22003)
- Updated Online Web Application – an electronic application to obtain a streamflow duration classification based on user-submitted data; also provides users the option to generate a report of their results.
- Data used to develop the beta SDAM for the Great Plains.
- Joint Public Notice of Availability of the Beta Streamflow Duration Assessment Method for the Great Plains (pdf) (403.3 KB, September 2022)
- Review of Flow Duration Methods and Indicators of Flow Duration in the Scientific Literature: Great Plains of the United States (pdf) (2.1 MB, March 2022, EPA-840-B-22006)
