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Notice of Availability of the Regional Streamflow Duration Assessment Methods for the Arid West, Western Mountains, and Great Plains

REGULATORY DIVISION
Published Oct. 28, 2024
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The U.S. Army Corps of Engineers (Corps) Albuquerque, Chicago, Detroit, Fort Worth, Galveston, Kansas City, Los Angeles, Omaha, Rock Island, Sacramento, San Francisco, St. Louis, St. Paul, and Tulsa Districts, and the U.S. Environmental Protection Agency (EPA), Regions 5, 6, 7, 8, and 9 jointly announce the availability of the Regional Streamflow Duration Assessment Methods (Regional SDAMs) for the Arid West, Western Mountains and Great Plains. The methods are rapid assessment tools for distinguishing between ephemeral, intermittent, and perennial streamflow at the reach scale for the Arid West, Western Mountains and Great Plains regions.

These Regional SDAMs were developed for use in all or part of the states of Arizona, California, Colorado, Illinois, Iowa, Kansas, Michigan, Minnesota, Missouri, Montana, Nebraska, Nevada, New Mexico, North Dakota, Oklahoma, South Dakota, Texas, Utah, Wisconsin, and Wyoming by the Corps and the EPA (Figure 1). These methods result from a literature review and multi-year field study conducted at nearly 700 stream reaches across the range of hydrologic landscapes of the Arid West, Western Mountains and Great Plains. Developed through statistical analyses of the field data, the Regional SDAMs provide a data-driven approach using reliable indicators to determine streamflow duration class at the reach scale. The agencies are making these final Regional SDAMs available for public use. This follows completion of a more than one year preliminary implementation and comment period on beta methods to inform development of the final Regional SDAMs.

The Regional SDAMs for the Arid West, Western Mountains and Great Plains can be applied whenever there is uncertainty regarding streamflow duration class and a rapid evaluation method is desired. The methods provide a scientifically supported, rapid assessment framework to support best professional judgment in a consistent, robust, repeatable, and defensible way. The classification outcome resulting from application of the methods may inform a range of activities where information on streamflow duration class can improve ecological assessment, management, and decision-making. The Regional SDAMs were developed specifically from data collected in the Arid West, Western Mountains and Great Plains.

Practitioners such as stream ecologists, aquatic ecologists, hydrologists, and wetland scientists are encouraged to utilize the Regional SDAMs. All materials and tools necessary to understand and support application of the Regional SDAMs can be found at: https://www.epa.gov/streamflow-duration-assessment

 

Figure 1. Boundaries of the Regional SDAMs in the United States.


Streamflow
Streamflow Assessment Method
Regional Streamflow Duration Assessment Methods